Deleting Cache in Adobe Camera Raw from Library
Hi There ~
I've seen similar questions, but not a definitive answer....
Currently, in on my Macbook Pro, my:
Users --> Lv4Tunes --> Library --> Caches --> Adobe Camera Raw folder is at 85g.
My Hard drive is only 200 gb..and I am almost at capacity.
My Lightroom library lives on an external hard drive, and my back up of that library is on another external hard drive.
Can I delete ths Adobe Camera Raw cache without losing any data?
Thanks in advance for the information, it is appreciated.
The safest way to do it would be to purge the ACR cache and set its limit to a lower amount of disk space in preferences:
This will cause some minor slow down in Develop in the beginning, otherwise no impact. A reasonable size depends on the size of your images, but generally a size of 20-50GB is recommended.
Beat Gossweiler
Switzerland
Similar Messages
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Can I open Adobe Camera Raw from LR?
I use LR 3.4.1 as my image browser but occasionaly would like to edit images using ACR as well as Photoshop. At the moment I have to go to "Edit in Photoshop ..." then switch to ACR via Bridge but would like to go straight to ACR without opening PS or bridge first. Is this possible? I know if open an image from finder it will automatically open in ACR first then PS, then have to import to LR but wondered if there was a shortcut from Lightroom.
I have been evaluating LR as an adjunct to Photoshop (or maybe the other way around!) and was amazed to see that an .nef opened in LR, developed and saved with, I assume, a sidecar, nevertheless does not allow that same file opened in ACR, to access that xml file as at least a choice. I was going to ask why, or how to do it, when I discovered this thread.
The path to doing so is convoluted but doable. Once you open in ACR from the Smart Object file, one needs to copy the settings save them and then when opening another nef in ACR without going to LR, one then loads those settings.
Makes for a big file of short time sidecars, unfortunately.
I assume the reverse is also true: Opening an nef in LR that has an ACR side car, that sidecar is ignored. Hafta try.
Why do I do this, you ask? The UI is far better in ACR than in LR. That bittsy side panel of tweaks is fussy and is similar to DXO in layout. I don't like theirs either. But lightroom does have it's stregths, and that is the data base.
Ok, I opened an nef already possessing a sidecar from ACR and LR did use it. So why not the other way around, or am I missing something?
Lawrence -
Change Adobe Camera Raw background color
Anybody know how to change the background color in Adobe Camera Raw from grey to white?
Unfortunately there is no option for changing the background color of the UI for ACR. However, this feature is available in Photoshop and Bridge.
Julia -
Lightroom 3 and Adobe Camera Raw cache files
Lately in: User/Library/Caches/Adobe Camera Raw I've been getting tons of (cache0000019858.dat) " just an example of one of the many files"
Are thes related to Lightroom 3?
What are they and can they be deleted or moved to another drive?
I primarly use this computer only for Lightroom 3.
Thanks
David MorrisJS4653 wrote:
If you change this location will it move the files from the pre-existing location to the new one?
The question also applies to LR4, which si what I'm using.
If you mean does it move the files in the cache - I don't know, but I doubt it and it doesn't really matter. It will just use the new cache location, so will be a bit slower until it builds up the cache (and it might leave a load of stranded garbage in the old location, so probably a good idea to purge the cache before changing the location, or delete the old one manually). -
Why can't I send older RAW files from iPhoto to Adobe Camera RAW?
I have a 20" Intel iMac (OS X 10.5.8) and use iPhoto '09 (Version 8.1.2) for storing and organizing the digital images produced by my Nikon D200 and D700 cameras. When I wish to edit a photo I right click on the image and select Edit in External Editor. The external editor is Photoshop Elements 6 for Mac.
In iPhoto/Preferences/Advanced for RAW Photos I have checked "Use RAW when using external editor." Recently I successfully sent new D200 and D700 RAW images from iPhoto to PSE 6 for conversion by Adobe Camera RAW (Version 5.4.0.57). However, I was not successful in attempting to do the same thing with older D200 RAW images taken more than three years ago. In all cases what showed up in ACR were JPEGs rather than the RAW images. I don't understand why this is happening. What is needed to resolve this issue? Any remedial information will be appreciated.
BobWell all of that tells us that the Library is sound and not corrupt - which is good news.
Now the question would seem to be 'Why isn't iPhoto respecting the settings you've chosen in the Preferences?"
Try trash the com.apple.iPhoto.plist file from the HD/Users/ Your Name / library / preferences folder. (Remember you'll need to reset your User options afterwards. These include minor settings like the window colour and so on. Note: If you've moved your library you'll need to point iPhoto at it again.)
What's the plist file?
For new users: Every application on your Mac has an accompanying plist file. It records certain User choices. For instance, in your favourite Word Processor it remembers your choice of Default Font, on your Web Browser is remembers things like your choice of Home Page. It even recalls what windows you had open last if your app allows you to pick up from where you left off last. The iPhoto plist file remembers things like the location of the Library, your choice of background colour, whether you are running a Referenced or Managed Library, what preferences you have for autosplitting events and so on. Trashing the plist file forces the app to generate a new one on the next launch, and this restores things to the Factory Defaults. Hence, if you've changed any of these things you'll need to reset them. If you haven't, then no bother. Trashing the plist file is Mac troubleshooting 101.
Regards
TD -
I just made the switch to mac. I am have installed all the new PS6 CC and bridge and I am not trying to add some presets to my ACR but when I search for the folder to place them it is not there. From what I researched it says it should be under camera library/application support/adobe/camera raw/settings but I can only get to library/application support/adobe/ and then there are two different camera raw options I have checked both and there are not settings folder. If anyone can help me please thanks
You want your user library
Mac(user)/Library/Application Support/Adobe/Camera Raw/Settings
In finder click on Go then hold down the Option key and then click on Library -
I am unable to open raw files taken on my Canon Rebel T1i in my version of Photoshop CS3. When I import raw files into Bridge they come up as patches with CR2 on them and when clicked on, a notice comes up stating that Photoshop does not recognize these files. I tried to update my Adobe Camera Raw by downloading version 4.6 from the Adobe Website, but when I clicked on the plus-in, I got another message that Photoshop does not recognize this file. I spoke with a representative from Canon who said that I could not update CS3 and that I should subscribe to the Cloud. I would prefer to use my CS3, if possible. Can anyone advise me what to do?
The T1i was first supported by Camera Raw 5.4 which is only compatible with CS4 and later
Camera Raw plug-in | Supported cameras
Camera Raw-compatible Adobe applications
Some options:
Upgrade to CS6
Join the Cloud
Download the free Adobe DNG converter, convert all T1i Raw files to DNGs then edit the DNGs in CS3
Camera raw, DNG | Adobe Photoshop CC -
How to get Adobe Camera RAW loaded so I can open RAW files from a Panasonic LX7?
I opened these images two days ago. Now I get a message that the CS6 Photoshop does not recognize this type of file. I went online and again(3rd time)downloaded Camera RAW 7.3 and tried installing and opening the images.
Once again - same thing.
Now I have something called a DNG converter on the machine and I don't know what it is.
I opened it and tried to get to the LX7 files in my computer I can see in Bridge - and the DNG converter does not show the files at all.
I was doing just fine with CS5 - then I bought this piece of crap because I could not get an update for CS5 to open the Panasonic Lumix LX7 images. So, I wasted $200 on CX6 only to find I can't get my images opened.
I hate photoshop more every damn day
First, took three days and over 9 hours wasted on hold for Adobe phone help - and finally got a guy on to help me register Photoshop CS6 - and he could not get it to register. Finally after a day & a half and hours of continually cutting and pasting from teh online computer to the main computer that does not hook up to the Internet I got CS6 to work.
Then, I opened the Panasonic LX7 RAW images twice after downloading and installing Adobe Camera RAW 7.1 and 7.3 - and now the machine does not recognize the files and tells me to go to http://www.adobe.com/go/kb407111
I went there and have downloaded the Camera Raw 7.1 and 7.3 four different times now and tried installing it - and Still can't open the damn files. I keep getting the same "photoshop cannot open this file" message and teh same referenc to teh above.
How can I get this piece of Shiz to work???
Oh - the name for ID above is after 22 minutes of trynig to find an name this program would accept.The first thing I would suggest is, in Photoshop, go to Help/About Plug-Ins and click on Camera Raw to verify what version is installed. There should only be one version listed, and listed only once. If there are more, then you need to get rid of the extras.
The DNG converter is a program that will create DNG (digital negative) copies of your raw images. It takes all of the raw image data and copies it to a new file format. The raw data is unmodified, and the DNG file is a standardized and open documented file format. But the DNG converter will not list the actual files. You choose the folder that contains your original raw images, and then the converter will put the copies wherever you choose to put them. But if your camera is supposed to be supported by the latest version of Camera Raw, I don't know if converting will solve the problem. It won't hurt anything; your raw files are still intact.
It would be helpful if you could describe your computer; operating system, how much RAM, a little information to allow the experts (of which I am NOT one) to help you isolate and solve this problem. -
I am attempting to install Camera raw from a .zip file provided via a link provided by adobe for a Nikon D810. The .zip file unzips fine and I moved the files to the recommended folder. But the operation is failing
Can you describe what “the operation is failing” means? What is happening and how is it different than what you expect?
Also, what product are you trying to update manually, and do you have a link to the page of instructions, so we know what your attempting to do? -
Can not open camera raw from 70d to adobe photoshop cc
can not open camera raw from 70d to adobe photoshop cc
In Photoshop, click Help > Updates
You need at least Camera Raw 8.2.
Photoshop CC ships with Camera Raw 8.0. -
I can't open three raw files from Adobe Camera Raw to Nik Efex
Something strange is going on that never happened before. I used to be on CS6 but now am on CC with the latest Adobe Camera Raw. I used to be able to select three photos in camera raw and then click Tools and then I'd see my Nik Efex plugins and choose which one I wanted. But all I see now is Photoshop under Tools at the bottom as an available option to open the files.
How do I open three files into Nik Efex HDR from Camera Raw? Is there something wrong here or am I just not doing things correctly. It seems I was doing this before and now I can't.Oh good lord. I can't believe I spent so much time on this and it's right there under Google. Thank you so much! Happy Thanksgiving!
Laura
Check me out @ http://www.lauramacky.com/ -
+++ Adobe Camera Raw - Frequently Asked Questions +++
Q: Is my camera supported by Adobe Camera Raw (ACR)?
A: Here is the list of cameras officially supported by the current version of Adobe Camera Raw and Digital Negative (DNG) converter. The page also provides links to the current version of ACR and DNG converter for both Mac and Windows.
Q: what version of Camera Raw should I install?
A: Photoshop CS6: see first question.
Photoshop CS5: Camera Raw 6.7 Win | Mac
Photoshop CS 4: Camera Raw 5.7 Win | Mac
Photoshop CS 3: Camera Raw 4.6 Win | Mac
Photoshop CS 2: Camera Raw 3.7 Win | Mac
Photoshop CS: Camera Raw 2.4 Win | Mac
For Photoshop Elements, Windows:
Photoshop Elements 10: (See first question)
Photoshop Elements 9: Camera Raw 6.5
Photoshop Elements 8: Camera Raw 6.2
Photoshop Elements 7 and 6: Camera Raw 5.6
Photoshop Elements 5: Camera Raw 4.6
Photoshop Elements 4: Camera Raw 3.7
Photoshop Elements 3: Camera Raw 3.6
For Photoshop Elements, Macintosh:
Photoshop Elements 10: (See first question)
Photoshop Elements 9: Camera Raw 6.5
Photoshop Elements 8: Camera Raw 6.2
Photoshop Elements 6: Camera Raw 5.6
Photoshop Elements 4.0.1: Camera Raw 4.6 ( 4.1 under Mac OS 10.3)
Photoshop Elements 3: Camera Raw 3.6
Q: What version of Camera Raw started to support my camera?
A: This page: http://www.adobe.com/go/kb407111 lists when support for the raw files of your camera was added in Camera Raw. If the version listed is higher than the one supported by your version of Camera Raw, you first need to convert the files to DNG using the latest version of the DNG converter in order to open them in Camera Raw.
Q: I do not have the latest version of Photoshop, how can I open the Raw files from my new camera?
A: Only the current version of Photoshop will receive ACR updates that add support for the latest cameras. However, you can download the latest version of the DNG converter, and use it to transform your raw files to the universal DNG format. Camera Raw 2.4 in Photoshop CS and all newer versions of Camera Raw compatible with your version of Photoshop will be able to open the DNG files. Photoshop 7 and ACR 1.0 do not support DNG, therefore you will need to upgrade to the latest version of Photoshop.
Q: When will the new update of Adobe Camera Raw be released?
A: Adobe cannot comment on unannounced products, however, it is expected that ACR and DNG converter will be simultaneously updated 3 or 4 times per year (i.e. every 3 or 4 months).
Q: What does "Unofficial Support" for a camera mean?
A: Unofficial support means that Adobe's Quality Engineering department has not tested the support to the degree that they want, and thus cannot guarantee the results. So we don't include the camera in our official lists, and don't provide any technical support. Unofficial support means "use at your own risk".
Q: How do I know that Adobe Camera Raw is installed correctly?
A: For Photoshop CS customers, the most efficient way to ensure that you have the latest Camera Raw update installed correctly is to choose the Updates option from the help menu. For Photoshop Elements customers the best way to verify that the Camera Raw plug-in is installed correctly is to make sure it appears (only once) in the "About Plug-in" menu (see: Photoshop menu on a Mac or Help menu on a PC). The correct version is displayed when you pick its name and see its about box. If "Camera Raw" is not in this list, you have not installed it correctly.
Q: Why is the profile listed in the Calibration tab showing a version of Adobe Camera Raw that's older than I am using ?
A: What you are seeing is normal, and is due to the fact that the built-in profile for your particular camera model hasn't changed between that version of Adobe Camera Raw and the version you're using now. If you see the profile listed as "beta" then your camera has only unofficial support.
Q: Why is there more than one profile listed in the Calibration tab of Adobe Camera Raw?
A: The built-in profile for your particular camera model has changed since it was first supported. The profile shown by default identifies the latest version of Adobe Camera Raw in which the profile was updated. Other profiles in the drop-down list identify those included with earlier versions of Adobe Camera Raw, and are available in case you want to maintain compatibility with earlier versions.
Q: My camera is listed, but Photoshop cannot read its raw files.
A: Download and install the most recent update to Adobe Camera Raw.
Q: Where can I download the latest version of Adobe Camera Raw?
A: Adobe Camera Raw for: Macintosh and Windows
Q: I am trying to replace my existing ACR plug-in with a more recent version, but cannot find ACR in my Photoshop/Plug-in/File Formats folder. Where is it located now?
A: As explained in the "Readme", which can be found on the ACR download page, the correct location is:
Photoshop CS2
Mac: /Library/Application Support/Adobe/Plug-ins/CS2/File Formats/
Win: \Program Files\Common Files\Adobe\Plug-ins\CS2\File Formats\
Photoshop CS3
Mac: /Library/Application Support/Adobe/Plug-ins/CS3/File Formats/
Win: \Program Files\Common Files\Adobe\Plug-ins\CS3\File Formats\
Note that "Common Files" is localized in non-english versions of Windows.
Q: Why do I only see a small generic icon in Adobe Bridge instead of a thumbnail when I browse the folder containing my RAW files?
A: Bridge occasionally has difficulty with RAW files, but this is usually because the user has installed ACR into the wrong location or browsed the folder prior to installing the ACR plug-in that provides support for their particular camera model. The fix for this issue is usually to make absolutely sure that ACR is installed correctly, then purge the Bridge cache. If you're in the habit of using the Distributed cache (Bridge 1.x) it would be prudent to manually delete the cache files from the folder containing your RAW files.
Q: Whenever I open an image in Adobe Camera Raw a small explanation mark within a yellow triangle appears in the upper right hand corner of the image.
A: This symbol indicates that a high quality preview is being generated by Adobe Camera Raw. It should disappear after a couple of seconds.
Q: How do I turn off Auto Adjustments in Adobe Camera Raw 3.x?
A: Open Adobe Camera Raw. On the Mac press Cmd+U or on the PC Ctrl+U. This keystroke combination toggles Auto Adjustments On and Off. Alternatively, disable the Auto Adjustments setting from the fly-out menu adjacent to the Setting drop-down menu. If you want the default to be Off for Auto Adjustments simply choose "Save New Camera Raw Default" from the fly-out menu adjacent to the "Settings" drop-down menu then choose Done.
Q: What about Adobe Camera Raw 3.7 and newer versions?
A: Camera Raw 3.7 no longer supports per slider auto adjustments. One Auto control at the top of the panel now sets the Exposure, Shadows, Brightness, and Contrast sliders to their auto values. The Default control at the top of the panel sets these same four sliders to their default values. The keyboard shortcut for the Auto control is CMD/CTRL-U.
The keyboard shortcut for the Default control is CMD/CTRL-R.
Double clicking on a slider to set that single slider to its default value.
Shift double clicking on a slider to set that single slider to its auto value.
Q: Why do I get the the following message: "Unable to create an .xmp sidecar file. The image settings will instead be stored in the Adobe Camera Raw database."
A: This message means that Adobe Camera Raw is unable to write to the XMP sidecar file. Either the media is read-only (e.g. a CD), or you don't have write access to the folder containing the image, or the existing XMP sidecar file is locked.
Q: I cannot see all the tools and buttons of Adobe Camera Raw.
A: Set your monitor resolution to the minimum required for Photoshop CS and higher, i.e. 1024x768.
Q: Where can I obtain a listing of Adobe Camera Raw keyboard shortcuts and modifiers?
A: On the Photoshop online help file.
Q: When I open my Nikon NEF files, all I see is the simple version of the raw dialog.
A: You are running Nikon's plug-in, not Adobe's. Delete from Photoshop's plug-in folder and all subfolders all copies of the "Nikon NEF plugin". Nikon automatically installs this plug-in in up to two places inside Photoshop's plug-in folder, and both must be deleted. Otherwise it overrides the Adobe plug-in. An alternative to the deletion is adding ~ in front of the Nikon plug-ins names.
Q: I installed the update. I can now open my raw files, but I still cannot see thumbnails in the file browser.
A: Purge the file browser cache for the problem folder. Tools > Cache > Purge cache for this folder.
Q: Is it better to resize my images in Camera Raw, or in Photoshop?
A: The resampling code is fairly similar to (but not exactly the same as) the "Bicubic Sharper" resampling in Photoshop CS and CS2. It does not make very much difference which stage you do the resampling in. The exception is non-square pixel cameras (Nikon D1x and Fuji S2 Pro), for which it is best to upsample one size step in Camera Raw if you need a larger image.
Q: What are raw images, and how do they differ from JPEG ones?
A: Read this whitepaper (1MB PDF) written by Bruce Fraser for a concise answer.You can check compatibility yourself:
1. Go to this page to see the different releases: http://forums.adobe.com/thread/311515?tstart=0
2. Navigate into the download link for the appropriate version of Camera Raw.
3. Follow the link to the ReadMe (e.g., http://www.adobe.com/special/photoshop/camera_raw/Camera_Raw_4.6_ReadMe.pdf).
4. Look to see whether your camera is supported.
5. If your camera is NOT supported, you can use the free Adobe DNG converter to create .dng files that your Camera Raw will be able to open.
Photoshop CS6 is anticipated to be out in a few months, and Camera Raw is supposed to have a whole new approach, so a lot of us are excited about anticipating that.
-Noel -
I just got a Nikon D300 camera and now need something to read RAW camera files.
From what I could tell, the Adobe Camera Raw 4.6 plugin was what I needed for CS3.
I did download it, but when I double-clicked on the Camera_Raw_4_6 file, it installed itself into my Photoshop Elements 7.0.
(I think Photoshop Elements 7.0 will take a later version of the camera raw file, but not sure if CS3 will)
Anyway, how do I get the camera raw plugin to install in CS3.
Ron in Round Rock
P.S. It does work in Photoshop Elements (i.e. I can read RAW .nef files), but I want it to work in CS3.Hey guys, thanks a whole bunch.
Yes, all the Camera Raw files were where they were supposed to be. I had a couple of Camera Raw files hanging out in temp locations and I deleted them, but it didn't help.
Then I started looking a little more closely at the Camera Raw file in the CS3 File Formats folder -- and noticed that it was a different size than the one un-zipped in my Download folder (the place where I save downloads and I did the un-zip there). The old Camera Raw file was around 9.7 MB while the new one was 10.4 MB.
Anyway, I went back to the download folder, picked up the latest Camera Raw there and replaced the one in the CS3 File Formats folder and everything works great now, both CS3 and Elements.
P.S. As I was typing this, I had a tendency to type KB instead of MB for the plugins (10 MB for a plugin, are you kidding me). I guess that shows you just how old I am -- well let's just say I was around when they invented computers -- and back when 64KB was a lot of memory -- and now 64MB is small and we are working with GB now, soon to be TB. Anyway, the other thing I wanted to mention was that the Camera Raw file in CS3 had a 2007 date on it, which was probably when I installed CS3 (couldn't find the version number listed anywhere). So the Camera Raw file was there, but probably didn't have the support for the Nikon D300 camera at that time. Everything worked on my desktop computer since I just replaced it a couple of months ago and had to reinstall everything.
Anyway, as I said, everything is working now.
IMPORTANT NOTE: And for anyone else that is having a similar problem, this is the fix. Check the dates on the Camera Raw file in your CS3 or Photoshop Elements File Format folders (thanks to the guys above for suppluying that location information) to make sure you are woking with the correct / current / right Camera Raw file.
Thanks again to everyone for pitching in on this. You led me to finding the solution to the problem and I couldn't be happier. This is the only place where a person like me, or probably anyone for that matter, can find this kind of help (personal and to the point). Sorry to make this so long..
Ron in Round Rock -
Adobe Camera Raw 6.7 Installation Failure
From Adobe Bridge CS5, I enter Help, then Updates.
Adobe Application Manager informs me that I can update Adobe Camera Raw to 6.7.
I click to install, the software is downloaded tha I get an Installation Failure message.
When I click on 'Customer Support' on the screen, I am directed to 'http://helpx.adobe.com/creative-suite/kb/error-serial-number-qualifying-product.html'.
At no point during the installation was I asked for the serial number.
Regards
MikePlease confirm your ACR version from Help->About Plugin->Camera Raw and provide us with the following logs.
You can find them at:
ACR Installer logs
For Mac:
Library\Logs\Adobe\Installer
For Win:
Program Files(x86)\Common Files\Adobe\Installers
AAM logs
For Mac:
/Volumes/%Volume Name%/Users/%Username%/Library/Application Support/Adobe/AAMUpdater/1.0
For Win:
C:\Users\<username>\AppData\Local\Adobe\AAMUpdater
You can zip all the files together and send us through mail. This would help us in finding the root cause.
Appreciate your help. Apologize for the inconvenience.
Regards,
Ashutosh
[email protected] -
I would love to set up Aperture to allow me to edit images in Adobe Camera Raw. I can open images from Aperture in Adobe Camera Raw by setting Adobe Bridge as my external editor, but none of the adjustments are saved in Aperture. From Bridge, I can also save the file as a dng file that Aperture should be able to read and save it in the numbered folder where Aperture placed the original raw image, but the saved dng file doesn't show up in Aperture. Apparently Aperture can't see any images in its own folders if it didn't place them there.
I also tried making my adjustments in Adobe Raw, saving it as a dng file and then importing it into Aperture. This is not ideal, as it would be convenient to do the Adobe Raw adjustments from within Aperture, but it does allow me to import the edits into Aperture. Aperture does something odd in this case. When I open the imported dng image in Aperture, at first it displays it with the edits I made in Adobe Raw but after a few seconds reverts to the originla raw image. I can't figure out how to recover the adjustments.
Can anyone fill me in on the nuances of Aperture in this workflow? Is there some way I can at least make the raw edits in Adobe Raw and make them available in Aperture.
Some of this may be my ignorance. For some reason, I have never been able to fully grok the whole version/master process in Aperture, never quite sure how to move between versions and masters. I suspect that some of my issues with the imported dng files is a version/master thing that I am not understanding.
I'm beginning to wish that I had set Aperture up to use external folders rather than place my files in the Aperture database. I think if I had done this it might have eased my current issues.
Is there any way to export an Aperture database so it exports the images into folders that correspond to projects and folders in Aperture? I suspect not, but . . . one can wish.
Any help with any of this would be greatly appreciated.
Thanks,
--KenoliKenoli Oleari1 wrote
If this is what is happening, it means Aperture can interpret the ADR data, but chooses not to. If I could get it to use that data, it could solve most of my issues.
In the Adobe Camera Raw preferences, there is a section called: 'DNG File Handling'. You can (and may already have) select the option 'Update embedded JPG previews' and use the drop down to select either Medium or Full Size. The result should be (in Bridge at least) that adjustments you make in ACR and then either click 'Done' to save to the .XMP file inside the DNG file or click 'Open' to launch and render the image in PS for further work.
The result should be an updated embedded JPEG inside the DNG file that can be used by any program that can read DNG and is set to use an embedded JPEG.
In testing on my machine a couple of years ago on Snow Leopard, the OS X included program Preview did not show the updated previews though. It only displayed the original RAW data. I assumed it either was not set to show any embedded JPEG preview, or was simply not designed to be compatible in that way. Preview uses the same digital camera RAW compatibility function of OS X that Aperture uses. So it did not surprise me to see that it was not working in Aperture at that time. This was either a later version of AP 2 or early version of AP3, but I can't remember for sure.
It was my understanding that the purpose and function of dng files is so that raw edits made by any software could be accessed cross platform through the open source dng file. If Aperture simply chooses to ignore that data, it defeats the purpose of dng.
My understanding of DNG is that it is an archive type file made of (1) a RAW conversion which holds the decoded RAW data, (2) any .XMP file that has been created by the decoding software as well as; (3) ITPC and EXIF metadata and some other info such as ICC profiles and the JPEG preview. You can also opt to include the original RAW file.
I don't know the extent to which Aperture is designed to support the DNG file though. Does it handle it like a PSD file where it retains the full file content, but only supports displaying it in a limited fashion (e.g., no transparency)? Or should it actually read the .XMP data file and render it based on that info? I don't think this is the case as the .XMP data that pertains to adjustments made by another RAW decoder doesn't seem to be compatilble with the way Aperture is handling adjustments.
You could certainly test the embedded JPEG in a DNG file by making and saving some changes to the copy of a file in Finder and then comparing the original DNG to the adjusted one using the Preview program. If the changes are not shown, then the issue (or lack of one depending on Apple's point of view) is with the OS X digital camera RAW compatibility function (which they update for new digital cameras periodically).
If Preview does show the changes, you could then import both the original and adjusted DNG into an Aperture library (even a new test library) and see if it displays the differences. If it does, then this would point to an issue with sending a file from inside Aperture to an external program and then saving back (assuming this still fails to work as you expect).
Sorry I don't have more. I decided not to go with DNG and just archive with RAW and JPEG depending on what I end up wanting to do with the images.
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