Saving rating to DNG?

How can I save the Ratings I've set in Bridge to the DNG. I want to work on the images in LR after I've edited them in Bridge and want to save the data to the file to LR can read it. I'm looking for a "Save Metadata to DNG" setting but can't find it. Am I missing something simple here?
~morgan

Morgan
Glad it works also for you :-)
As for the writing of Bridge to DNG, see the clarification above from Ramòn.
The funny thing about your statement about familiar to LR above Bridge is: mine would be the opposite. But both LR and Bridge use the same ACR engine.
I have LR but only use it rarely. It is a nice application but I can't get used to its way of handling files in catalogs. Also renaming and sorting in Bridge is IMO easier and more flexible as it is in Lightroom.
About handling large groups of similar files, I can't see why LR would handle them better then Bridge. But anyway, there are a lot of very happy Lightroom users and there seem to be as many workflows as there are users :-)

Similar Messages

  • How to set PSD as the default for Ctrl-S when saving a layered DNG for the first time?

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    Similar question. When I hit Ctrl-Alt-S, the default is TIFF; is there a way to make the default PSD?

  • Image Adjustments Not Saved with DNG?

    It appears that the adjustments (i.e. all of the work you do to "develop" your pictures) are not saved with the image file. They appear to be saved in the LR Library. So if anything happens to your library, your developing work is gone. I thought my adjustments were saved with the DNG, but this does not appear to be the case.
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    Thank you.

    Geoff and John,
    Thank you very much.
    You confirm the critical point that your work is saved in the Library, and the Library must be closely supervised and backed up.
    Beside my on-site backups, I set up a Stuffit schedule to back up a daily version of my library. My current library is 57.6MB and Stuffit compresses it to 8.7MB and automatically FTPs it to my web site for archiving.
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    For my DNGs, beside my on-site backups, I create a DNG with the RAW (NEF) file embedded and back them up on my web site. Then I create DNGs with Adobe DNG converter, without embedded RAWs (LR embeds the RAWs)to use for my working files.
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    Thanks again.
    Eric

  • Aperture lack of DNG support unfortunate

    It's difficult to understand why Aperture does not offer support for Adobe DNG files. 
    DNG/RAW files are being used by some camera manufacturers that I work with, and they contain a wealth of metadata as well as the broadest range of image data, including "altitude", which is now very useful in my professional work.
    This lack of support has forced me to go back to Lightroom, and to reconsider that application as my primary media catalogue and editing application.

    A JPEG saved as a DNG isn't really a DNG file.
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  • How to edit DNG in Photoshop after adjustments but without them?

    Ok, this might seem a stupid question but let me properly explain...
    Just to make it clear, I now know I cannot edit a DNG directly in Photoshop, this must be converted to TIFF and that one can be edited and imported back into Lightroom.
    I've read many posts where people tend to all LR adjustments and then go to PS for the final touches, but I prefer the other way around, PS first for any pixel editing and LR to finish the image. But I have two problems this simply because I forgot to edit some image in PS before making my LR adjustments. The only thing I wanted to do in PS was to remove some sensor dust I didn't notice before.
    The problem is that I have now finished all my LR adjustments and I can't find a proper way to edit the original (without LR adjustments). When I open the context menu in LR and select Edit » Photoshop, all LR adjustments will be processed and the TIFF file generated will have them.
    Q1: Isn't there a way to edit a DNG file in Photoshop without LR adjustments just like we can do it for any other type of file that is not some sort of RAW file?
    To answer my own question, the only way I found to do this was to preset the Reset button in the Develop module in LR and then to Edit » Photoshop. This will work but it's a little bit clumsy, anyway to avoid this or is it my only option?
    Let's say I do it like that anyway. I'm now with the original untouched DNG file converted to TIFF opened in Photoshop, I do all my pixel editing and save the file. This TIFF file will be automatically imported into Lightroom so I can do any final touches. Since I did a "reset" and the image edited in Photoshop was the original untouched by LR, I now need to do all my editing in LR all over again.
    I though of simply copying all develop settings from the old original DNG into the new converted TIFF. But this doesn't work, the files are different, the same settings do not work for these 2 different fle types. The image looks completetly different.
    Q2: How can I fix this without playing with all the sliders again to achieve the same look?
    I've been done this road before and it was a painful process, in the end, I was not able to get the same exact result.
    EDIT: I did not mention the spot removal tool because I wasn't getting very good results with it, it doesn't work as good as Photoshop's tools. The sensor dust was in the sky and very close to some clouds, selecting the whole thing was not working. After some time, I added 5 spot removals and was able to properly clean the sky of that dust. Still would love to hear opinions on my questions above.

    Not it's not, it's my workflow, why don't you understand that? If I want to edit in PS first, well, that's my decision, you are assuming I want to keep the RAW data intact and if I wanted yes, my workflow would be wrong because I couldn't do it like that, but I don't want to keep it. Actually, in a perfect world, I would want to be able to keep RAW data and do som pixel editing in the same file, but this is not a perfect world so I'm fine in losing the RAW data. I never stated that but I though it was implicit the way I described my workflow.
    I already knew everything you said in your post, nothing new there.
    "You really can't move back and forth it one direction only..."
    Like I said, I'm not looking moving back and forth, I don't think yous guys are understanding my question properly. Let's take another approach to see if you guys understand it better. I shot some photo in RAW and converted it to JPG (yes JPG), I've now lost any RAW data. However, I like to keep my files in DNG (DNG is a container so I can do that) and convert the JPG file into a DNG. I know have my "master" file as a JPG file in a DNG container.
    I start to do some editing in LR in my master file but I forgot to remove the dust on Photoshop and now I need someway to open the original in Photoshop to remove it, because I don't want to lose all my LR adjustments, I want to edit the original and keep my LR adjustments. But even if the file inside the DNG container is a JPG file, since the file format is DNG, I don't have the option to Edit without LR adjustments when I chose Edit » Photoshop. As soon as I do that, the DNG file will be opened in PS with all LR adjustments, but this file is actually a JPG, there's no RAW data anymore. The only way to edit the original file like this is to "reset" all LR adjustments before going pressing the edit context menu option and then copy back all settings from a to b.
    Now, this will work just fine because the original file is no longer RAW data, but linear data (I think it's called like this? what I mean, is a JPG, not RAW; i'll call it like this from now on, sorry if this is wrong) and so the settings can be copied at will from one file to ther other without any problems. After a bit of research I read around this forums that LR settings differ slightly if the original file is RAW data or linear data. For instance, the middle point for Temperature is actually 0 for JPG files but if it's a RAW file, it's something like 6500K (not necessarily this, just an example), and that means I can't copy the settings back and forth with a copy/paste.
    So, to recapitulate...
    My original image is now linear data (JPG) not RAW and saved into a DNG container and since it's a DNG container I cannot open the context menu Edit » Photoshop » Without LR Adjustments. Why? Is there any other any way around it or there's nothing I can besides making a reset or saving a snapshot in LR with the original settings so I can open them at will in PS and then copy the settings from a to b. I just don't understand why there isn't an option, for DNG files, to open it without all LR adjustments like all other files. It's actually a JPG file inside, not RAW data, so, why not? But even if it was RAW data, there could be such an option to. I mean, when you have RAW data and press Edit » Photoshop, the file will be demosaiced (or whatever it's called) and opened in PS, when you save it, it will be saved as TIFF. So why isn't there an option to demosaic the original file without LR adjustments.
    As to my second question, I guess there's no way to solve it either. The data on each file is different and the sliders behave differently so there's not way to copy the settings from a file to another if the saved data is not of the same type. And there's also no way to "convert" the settings from one file to the other, or is there? That was actually my question, if there was a way to copy/convert the settings from a RAW file into a linear file so I don't have to move all the sliders all over again and try to achieve the same goal. But after a quick search around the forums, I found a related question and I guess there's no way to do it.

  • Dng. files from LR to PS CC ok Can't open in Camera Raw?

    I have LR 5.7 and can edit my dng. files in PS CC but I can only get Camera Filter not full camera raw w/ all the tools. I am a PC user, BTW.
    How do I open full Camera raw for a dng. file?
    Thanks, very frustrated.
    Chris

    Because it was edited in lightroom first, photoshop knows enough to bypass camera raw since the controls are identical. If you open the dng file using the normal way like any other format, then it would open in camera raw first.
    Keep in mind if you already did any editing in lightroom, those edits needs to be saved to that dng file before you can do the above otherwise camera raw and photoshop will not see the edits you did.
    To save a file in lightroom select the file in the library and use ctrl-s to save.
    If you do the above, lightroom will not automatically see the changes done in camera raw or photoshop. In library view there will be an icon in the thumbnails corner. This appears when changes to the metadata do not match that of lightroom's database. Clicking the icon should provide a dialog box asking if you want to update lightroom or leave it unchanged.
    If you do a folder full, you can sync that folder to update all of them. Keep in mind syncing overwrites your changes in lightroom so make sure that is what you want to do.
    I personally try to make it a habit to save all the images from lightroom, just so I don't get any surprises when syncing. There is an icon in the corner of those that need saving.

  • Saving edited RAW files in iphoto

    Hi I have searched the forum but cant find an answer that works for me and I have also read this
    http://http://barbarabrundage.com/2010/11/29/using-photoshop-elements-9-with-iphoto/ 
    Basically I am opening my Raw images in PSE 10 as my external editor from Iphoto 11. My question is what is the best way to save it back to iphoto?
    I have tried the instructions in the above link and set PSE 10 to 'save over current file' in the savings preferences but when I clicked save image after editing in camera raw it opened the save as menu
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    Apologies I am very new to this, any help would be great
    Chris

    Ok thanks, is there any way to keep the format of the file then and save into iphoto as per the linked article? Would I have to keep it as a NEF file??
    Also when I've edited a Raw photo if I am going to save it to desktop and import it back to iphoto what file type should I be saving it as? I used  PSD last time is this right?
    One final question when should I be saving files as DNG as this is what the book I am reading refers to but i dont know if these can be saved to iphoto or what their purpose is
    Thanks again

  • I edited a .nef file in Camera Raw and PSE 11 saved it as a .xmp file.  I cannot open it now.

    I edited a .nef file in Camera Raw and PSE 11 saved it as a .xmp file.  I cannot open it now.
    I am not sure if this is an issue but Windows does not recognize the .xmp file and give it an icon with the photo's picture.  On a related note, when I edited some .nef files and Windows saved it as .dng file, it too, like the .xmp file, Windows does not recognize the .dng file and give it an icon with the photo's picture.
    Do I need to download something to create this icon?

    PSE didn't save your file as an .xmp file. The .xmp file is not the image--that's still the .nef. The xmp file is what adobe calls a 'sidecar' file, just a record of the settings you used in the raw converter. As long as it's in the same place as the image, when you open the nef in ACR again, it will open where you left off, with the settings you chose.
    If you want to save as, you have two choices:
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    2. Use the Save button in the raw converter to create a separate DNG file, which still must be opened in the raw converter and converted to an image format for use in other programs.

  • I'm considering buying CC LR/PS package. My camera is Sony a7 - raw ARW. I've been editing using PSE10 and ver 8.7 of the external Adobe DNG converter. Will I be able to open the DNG files in LR with the edits preserved? Will I be able to open the PSD fil

    I'm considering buying CC LR/PS package. My camera is Sony a7 - raw ARW. I've been editing using PSE10 and ver 8.7 of the external Adobe DNG converter. Will I be able to open the DNG files in LR with the edits preserved? Will I be able to open the PSD files in LR with the edits preserved? Any import/catalog etc issues between PSE10 and LR?

    Lightroom has no problem reading DNG files. Whether the edits you have done to the DNGs you have originally edited in Photoshop Elements 10 I'm not sure. ACR edits made to DNGs are saved in the DNG file itself, as apposed to a XMP sidecar file, so LR should see those edits. At the worst you will get an exclamation mark in the upper right hand corner of the imported DNGs and clicking on that exclamation mark you will get a dialog box asking you to either import settings from disk or overwrite settings. you would select import settings from disk.

  • Develop Settings and DNG files...where is the info stored?

    I just converted my Nikon NEF files to DNG. Previously I saved all changes I would make to my photos in the XMP sidecar files. I'm confused how things are working now because I thought those same changes would be saved to the DNG file.
    Now that I use DNG files, when I make adjustments to the develop settings in LR, are those changes ONLY saved to the catalog? Or is there a way to save them into the DNG file so I can bring them to LR on another computer and see my changes? I feel like when I had XMP files before with my RAW files, the develop settings were saved there in addition to the catalog, so my changes came with me... Maybe I'm wrong though.

    >Each of my RAW files also has a corresponding 10KB XMP file.
    These are known as XMP sidecars and are applicable only to proprietary raw files (e.g. CR2, NEF, etc). Adobe have a policy of not writing anything back into a proprietary raw file (exception being date/time stamp) because the proprietary data tends to be undocumented. The XMP sidecar provides a safe documented means of storing the metadata corresponding to each proprietary raw file.
    > I understood that the metadata is written to the file itself, but apparently only to DNG JPG and Tif files - right?
    Correct
    >So, if this is correct, then all metadata except that originally written by the camera is saved in the XMP file on RAW files?
    For proprietary raw files the metadata is written into the XMP sidecar, but for the other formats you mention it's written "into" the XMP block of the actual file.
    > Is the XMP file the information used by the Catalog? If I open a RAW image in Photoshop CS3 will the XMP information be read and applied when the file opens?
    Yes to both questions

  • Editing JPEG in RAW, Saving Crooked

    HELP!! My camera does not shoot in RAW format, however PSE9 states that I can edit my JPEG images in "camera RAW" then save it to print later.(They save in DNG. or dng. only)
    PROBLEM: the image is saved an eighth turn crooked and generaly most of the image is lost or out of "frame" so I can't even re-crop or straighten the image back out!!
    How do I save this new RAW image straight? Or what am I doing wrong??
    Tried to upload an example but its too bigI guess, Sorry.

    OK So I looked into y'all's advice and went back to try to discern what I was doing. So here is a break down of what I did.
    Opened PS Elements 9 Edit
    Chose photo to edit, opened as "Camera Raw"
    (Photo opened in RAW Editor)
    Edited shot
    Saved shot in 2 formats;
      Saved as a JPEG: (result; shot saved in reverse and crooked by 1/8 turn left, but I can open anywhere and print)
      Saved as a DNG: (result; Shot saved correct, but only opens in RAW Editor and can't print!!)
    I prefer the RAW edited shot over the PSE9 Editor shot but I can't figure out how to print it!!
    PS: Can someone please translate what ACR is?!?!?!
    Sorry still new to the technical lingo!!

  • Export DNG with edits?

    I'm going crazy trying to figure out how to export my edited DNGs from Lightroom. No matter what I do, when I export a DNG it exports the original file WITHOUT my modifications (crop, white balance, etc.) Am I missing something? Thanks!

    Let's not forget, that if you do not have the option to 'automatically write changes to XMP' turned on, then you will have to manually select photos, and choose 'Metadata | Save Metadata to file', or 'Metadata | Update DNG Preview & Metadata' to have the changes you make in Lightroom saved into the DNG files and not just inside the Lightroom database. If you do not do this, then no external program will be aware of your changes to the DNG files at all.
    What Jao said is true about other programs understanding the "edit list". It's only going to be understood by CS3 or Lightroom. But the instructions will be saved for those that understand it if you ask it to, and a fully developed preview will be saved if you choose the 'Update DNG Preview & Metadata' option. Other DNG aware programs will at least be able to see that.
    Steve

  • Apple's support of DNG format is fallacious

    on the Aperture brag page http://www.apple.com/aperture/ it purports "It also supports the Adobe DNG format."
    I went to Bridge/ACR, grabbed five tweaked nikon NEFS and saved them as DNG files.
    I imported this new folder of these five tweaked DNG files into Aperture. It did open the DNG files, but none of the adjustments to the image where evident and the display was the unaltered RAW file.
    Sorry Appleture, that does not constitute SUPPORT of the DNG format. DNG is not just another RAW format, it is a RAW format with the adjustments included.
    This is the last straw for me. Time to cut my losses.
    I am going to eBay my Academic copy of Aperture for $200. I am a huge fan of Apple products, but not Aperture. IF this was an intro price of $49 then I would not complain.
    This is nothing more than a improvement to iPhoto, but not enough to be called "iPhoto Pro".

    I absolutely agree, never did argue the point that Aperture did not pick up the DNG info. Just said that Bridge embeds info into the DNG. I also agree that this is a very large sticking point I have with Aperture. I just hope they offer the option of embedding informaition into the exported files as well as the ability to change the name of the file after importing. I understand their desire not to touch the files, but given that I would bet 99.9% of photographers would want to edit down first and then change the names on the keepers I think the developers need to change their paradigm on not touching the original files, after all, that was the idea behind DNG.
    Imagine 2 workflows.
    The current Aperture:
    Open Aperture
    Import 500 files
    Cull out 200 files.
    Keep 300 files
    Don't bother correcting because of the need to export and all the metadata will be lost.
    Export the keepers.
    Delete the remaining 300 files in Aperture
    Open Bridge
    Open the just exported files.
    Wait for them to load.
    Rename the files to what you want because Aperture forces a space in the name and you do not want that space.
    Enter all the file shoot info so if you export from Aperture, the metadata info that was imported within Aperture stays with the file and only that info.
    Close Bridge
    Reimport 300 renamed files back into Aperture
    Done, I think.....
    A new Aperture (Hopefully)
    Open Aperture
    Import 500 Files color correcting on the fly to see if they are keepers.
    Cull 200 Files
    Rename the remaining 300 files.
    Enter all file shoot info.
    Done
    The new Aperture now writes all the info back to the original file including filename, metadata etc. Everytime you export or open in Photoshop, Aperture passes the filename and metadata info along. Life is good.
    Granted they currently do not want to write into the file, but most of us would prefer it so when we send something to a client we do not have to keep reentering it. Furthermore, all of us would be doing it anyway, just in a different app., so whats the difference? I am very very hopeful they will correct this quickly in a future version, if not, it is a deal breaker for me, not to mention the other deal breakers it currently has.

  • DNG profile management

    Is it possible to create and use a shoot-specific custom DNG profile to process a set of images for a given shoot, and then archive that DNG profile for safekeeping but removed from view of Lightroom's Camera Calibration panel, without compromising Lightroom's ability to still work with that shoot's images - say, to make further develop refinements, virtual copy variations, prints, etc.?
    Asked slightly differently, when in Lightroom's Camera Calibration panel you select a specific DNG profile to apply to a given raw image, does the profile data from within that DNG profile become image-specific metadata of the target image and get stored along with the rest of the image-specific metadata in the Lightroom catalog itself (and subsequently in the DNG raw image file when I save the Lightroom data to that image file)? Or, instead, is only the IDENTITY of the selected DNG profile saved as image-specific metadata, with the DNG profile itself needing to remain "installed" in order to carry out any future Lightroom work on that raw image?
    Using the X-Rite ColorChecker Passport in conjunction with Lightroom, it is quite easy to imagine creating custom DNG profiles specific to a given shoot's unique lighting conditions. Creating DNG profiles specific to a given shoot, the collection of shoot-specific DNG profiles for a given camera body could grow to be quite large over time, making it tedious to wade through that collection in Lightroom's Camera Calibration panel to select the particular profile for the shoot being processed. X-Rite makes the "DNG Profile Manager" available to registered users of the ColorChecker Passport to assist with this very problem. It's great that this utility allows us to "Disable" DNG profiles, allowing us to keep our Lightroom Camera Calibration "Profile" menu manageable. But, if you use the X-Rite DNG Profile Manager to do this, does "disabling" a given DNG profile interfere with any further work in Lightroom on images for which that given DNG profile has ALREADY been applied?
    PLEASE do not speculate on this response. If you do not know for certain, please allow someone who does (an Adobe engineer, perhaps?) to enlighten us.
    Thanks in advance,
    /eddie

    Thank you to those who have offered responses.
    Please do not get confused. As the most recent response clarifies, this is not about storing profiles within original raw files, or the differences between DNG files and original raw files. In fact, at it essence, my real concern is not even about DNG files at all, really, although it includes them by association.
    My original question can really be answered in consideration of Lightroom alone: When a custom DNG profile is selected for an image by using the Camera Calibration panel of Lightroom's Develop module, does Lightroom itself internalize that DNG profile selection by recording into the Lightroom metadata database only the IDENTITY of that DNG profile assignment, or the actual DNG profile data contained within that DNG profile? If Lightroom records into the Lightroom database only the identity of the assigned DNG profile, then Lightroom would of course need to go back into that DNG profile later for the actual DNG profile data in order to do any subsequent development processing of the image for which that DNG profile was assigned. If, however, selection of a DNG profile using the Camera Calibration panel of Lightroom's Develop module causes Lightroom to record into the Lightroom database the actual DNG profile data contained within the selected DNG profile, then Lightroom would have no need to go back into that DNG profile later for the profile data, and the DNG profile itself could be safely "un-installed" ("Disabled" by the X-Rite DNG Profile Manager) without adversely affecting Lightroom's ability to properly process that image using the selected DNG profile's information. DNG image files themselves are not even really involved in determining the answer at this level.
    The interplay with the associated raw image's DNG image file occurs when Lightroom-maintained metadata for the image is saved out into the DNG image file itself, either automatically or manually, and, yes, I was being very specific to discuss DNG raw image files in that context. I understand from the response provided by "ssprengel" that saving the actual DNG profile data out into the associated DNG image file only happens when using "Update DNG Metadata & Preview" and does not happen through the more common routes of automatically or manually saving image metadata back to the DNG image file. Why this more robust ("complete"?) level of image metadata preservation out to the DNG image file only occurs through a more obscure mechanism is a mystery to me, but that is not the topic of this discussion.
    So, my real question really still remains. Combining the ideas from both of the paragraphs above, if Lightroom only saves DNG profile data out to the associated DNG image file using this more obscure mechanism, then does that mean that Lightroom does not normally retain the DNG profile data within the Lightroom database at all -- that it really only retains the identity of the selected DNG profile, and that only when this obscure mechanism is explicitly invoked does Lightroom deem it appropriate to actually read the profile data out of the selected DNG profile and pass that profile data along to the associated DNG image file, and that even then Lightroom itself does not retain that profile data internally? If this is the case, then the DNG profile cannot be "Disabled" without adversely affecting normal Lightroom processing of the associated image [by "adversely", I mean without having Lightroom revert to the Adobe Standard profile or any other unintended side effects]. However, if Lightroom actually does retain this profile data internally upon original DNG profile selection, even if it doesn't bother to save it to the associated DNG image file except through the use of the obscure function, then it would be safe to "Disable" the DNG profile after initial profile selection and not interfere with Lightroom's normal ability to process the associated image using that profile.
    Taking the obscure function awareness into account, I guess this now has the possibility of making this subject much more complex. If Lightroom does not store DNG profile data within the Lightroom database (which would require continued availability of the DNG profile for processing associated images), BUT Lightroom provides this obscure mechanism for "forcing" save of assigned DNG profile data out to the associated DNG image file, then what happens when the DNG profile is "Disabled" and Lightroom goes to process that image? Does it look into the associated DNG image file to determine if actual DNG profile data has been saved there and go ahead and use it if it exists? Or does Lightroom ignore DNG profile data saved to a DNG image file in all contexts, and unconditionally always require the assigned DNG profile to remain available in order to carry out normal Lightroom development or rendering processing of the associated image?
    This is admittedly a lot of words to discuss a simple desire: I want to shoot with shoot-specific DNG profiles, assign them to the shoot's images and develop them, and then archive off ("Disable") the DNG profiles from that shoot so that my Camera Calibration "Profile" listbox does not become unmanageable. Period. If I absolutely must go back and re-Enable a specific DNG profile later to make a print of one of those images a year from now, then I guess that's what I have to do, but that seems a real shame when all other image-assigned "edits" store those "edits" as image-specific metadata, and profile assignment is just another "edit" (although saving the profile data, rather than just the profile identity, may not be included in this "edit"). Whatever works out to be the simplest, most straightforward course to accomplish my objective is what I need to do. Ideally, that would be painless if Lightroom records into the Lightroom database the actual DNG profile data when the profile is assigned to an image using the Camera Calibration panel's Profile selector.

  • Why DNG files are bigger when converting from TIFF?

    When I shoot in RAW, my normal workflow is to convert all images to DNG and start editing in Lightroom. But as you know, there are some photos that need extra editing in pixel based software such as Photoshop.
    When I right-click a DNG in Lightroom and chose "Edit In... » Edit in Adobe Photoshop", the photo will be opened in Photoshop as an 8-bit TIFF file for editing. For demonstration of my issue, let's assume I don't do any changes and just save the file as it is. A new TIFF file will be created next to the source DNG with "-Edit" in it's name.
    Back into Lightroom, both files are almost the same, one is DNG, the other in 8-bit TIFF. From this point (assuming I did change something in Photoshop, otherwise what would be the point in opening it there) I should do my further editing in Lightroom in the TIFF and not the DNG one. Let's say I'm done with the work and export the final edited TIFF file back into a DNG (I like this format and I like to keep all metadata changes so I can easily revert back to the original). I've also exported the original DNG file for comparison.
    And now I realize the following:
    DNG to DNG » ~7Mb (basically the same as the original DNG)
    TIFF to DNG » ~15Mb
    Why such a big difference?
    I didn't do any editing either in the original DNG or the Photoshop converted TIFF. Any techincal reason for this that I'm not aware or am I doing something wrong?

    I did a little bit of research and:
    1) The embedded previews are always JPEG files (medim or full size, doesn't matter). But now that I think about it, I don't think you were talking about the previews when you mentioned the TIFF being embedded.
    2) I did a quick EXIF lookup on 3 files exported to DNG: a) Original DNG b) 16-bit TIFF converted to DNG c) 8-bit converted to DNG. Here's the EXIF results:
    a)
    SubfileType                     : Full-resolution Image
    ImageWidth                      : 3736
    ImageHeight                     : 2772
    BitsPerSample                   : 16
    Compression                     : JPEG
    PhotometricInterpretation       : Color Filter Array
    SamplesPerPixel                 : 1
    b)
    SubfileType                     : Full-resolution Image
    ImageWidth                      : 3648
    ImageHeight                     : 2736
    BitsPerSample                   : 16 16 16
    Compression                     : JPEG
    PhotometricInterpretation       : Linear Raw
    SamplesPerPixel                 : 3
    c)
    SubfileType                     : Full-resolution Image
    ImageWidth                      : 3648
    ImageHeight                     : 2736
    BitsPerSample                   : 8 8 8
    Compression                     : JPEG
    PhotometricInterpretation       : Linear Raw
    SamplesPerPixel                 : 3
    This probably means something like you said... The embedded files are different and some take more space than the others. The first one is 7.220Kb, the second one (16-bit TIFF) is 44.030Kb and the third one (8-bit TIFF) is 15.284Kb.
    It makes sense I guess, but I still would love to hear a more technical explanation for it but it's obvious it has something to do on how the pixels are saved in the DNG file. The keyword is probably the PhotometricInterpretation.

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