Export JPEG quality must be chosen twice

Mac OS X, Lightroom 1.4.1: In Library mode, choose export, choose JPEG and quality. Then photo is opened in Photoshop and once again you have to choose jpeg quality. OK with only a few photos, but tiresome when exporting many. Is it possible only having to choose jpeg quality once (in Lightroom).

The High setting gives you the same file size as the original file was. The medium setting results is aboutg a 50% file size reduction. The max selection greatly increases the file size but I'm not sure it increase the image quality to any noticable degree.
The image I tested resulted in these file sizes sizes: Original 1.4MB, High 1.4MB, Medium 774KB, Small, 402KB and Maximum, 4.6 MB. The pixel dimension of the photo remained the same in all files.
Personally I couldn't see much difference between all of them but them my eyes are on the down side of the "hill". This website gives some interesting insight into jpeg compression: JPEG
OT

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File Export JPEG Quality Maximum

I have imported a 148KB image 857x1280 at 100ppi into iphoto. When I File> Export at Maximum JPEG quality I get a 475KB image. Same dimensions, same ppi. Can someone explain why please?
Thanks

But JPEG compression isn't just about "pixels being thrown away," and it's relative to the original. What could be happening in this case is:
Original was probably saved at a level like JPEG Medium (around 60), since that's pretty common. Data is thrown out, so quite a bit of pixels and color info are downsampled and it drops to 148KB.
Now you open it up and save it out at JPEG Maximum. You are telling it to preserve as much as it can, so it carefully makes note of all the existing data and writes it all out. But the problem is, the existing data was turned into worse data before, so all you did with JPEG Maximum is make it faithfully record a lot of garbage. The reason the file size went up is probably because JPEG cannot use many of the shortcuts it used to save the file out the last time, so even though there's a lot of lower quality data in it, it must still be recorded faithfully (taking up more space) because you set it to Maximum.
This would happen whether you were working with pictures, audio, or video. Rough example: If you take a cheap old webcam video with low resolution and chunky compression, and you add it to a full HD movie, the file size is going to be change to huge HD size, not tiny webcam size. Or if you take a low-bit MP3 and resave it as a high-bit MP3 or as a standard CD file, it is going to get bigger; the sound is no better but the file must grow.

Bloated exported jpegs??

I start by importing a 4 meg file (jpg). Apply a few Lightroom tweeks and export jpg (quality 100%) and file size triples to 12 megs. Why so big?
I can lower quality to 80% and then it is pretty close to the original. But I prefer not to do this.
I have also noticed a much bigger file size when exporting web galleries and have to drag the sliders down to about 60% quality to keep files small for web viewing.

Lora, here is what I think is happening. The JPEGS you started with are expanded to uncompressed images within LR's rendering pipeline, simply because they have to be in order for LR (or any other imaging application) to work with them. At this point, they in memory and are MUCH larger than the JPEG files you started with since they are not compressed.
After processing, when you tell LR to do an Export, the JPEGS you started with are expanded to uncompressed images within LR's rendering pipeline, simply because they have to be in order for LR (or any other imaging application) to work with them. At this point, they are MUCH larger than the JPEG files you started with.
LR then proceeds to apply all of your edits to the files, and then it creates new JPEGs in whatever folder you told it to export to. The new JPEGs are compressed using the settings in the Export dialog, and if you choose a higher image quality than the original JPEGS, they can certainly be be larger than the original files.
Note that I am NOT saying that the new JPEGs will actually be higher quality than the originals. JPEGs use lossy compression, so whatever compression was used to produce the original JPEGS threw content away that can never be recovered. But the LR doesn't care about that, and works on the contents of the file as it had pristine originals to work with, so it's very possible to tell it to produce JPEGs that are larger than you started with. It's just that there is not much point to actually doing so.
Don's suggestion about Auto Export doesn't really apply here, since it refers to files that are within the Library. Exported files, such as we're talking about, will ALWAYS get the metadata written into the file, unless you have turned on the "minimize metadata" checkbox in the Export dialog. I'd have a hard time believing that this is the sole cause of the size increase, though; metadata shouldn't take up more than a few kilobytes even in a worst case scenario.
Bottom line: set the Export JPEG quality to your needs, without regard to what the original JPEG sizes were.

Aperture Exporting JPEG's from RAW: file size and quality questions?

Hey Everyone,
So, I'm using Aperture 2 and I've got some questions about exporting from RAW to JPEG. I shoot with a Nikon D70 so original RAW files are 5-6mb in size. After doing some basic post processing when I export the pics at "full size" with picture quality of 11 out of 12 then the resulting JPEG is about half the file size of the original RAW file. For example a 5.6mb RAW becomes a 2.6mb JPEG. The resolution in pixels per inch and and the overall image size remain unchanged. Have I lost picture quality due to the exporting JPEG being smaller in file size?
My friend who works with me prefers to edit in Photoshop and when he follows the same workflow his saved JPEG from the identical RAW file in Photoshop is minimally smaller in file size, say 5.6mb to 5.3mb. He's telling me that my Aperture edited photos are losing quality and resolution.
Is he right, are my pics of lesser quality due to being a smaller file size? I've always been told that the quality of a picture is not in the mbs, but the pixel density.
I've bee told that Aperture has a better compression engine and that the resulting files are of the exact same quality because the PPI and image size are the same. Is that what explains the much smaller file sizes in Aperture?
I tried changing the picture quality in the export menu to 12 out of 12, but the resulting JPEG then becomes larger than the original RAW at over 7mbs.
Can someone please help me understand this better? I don't want to lose picture quality if that is indeed what is happening.
Thanks in advance for your help.

mscriv wrote:
So, I'm using Aperture 2 and I've got some questions about exporting from RAW to JPEG. I shoot with a Nikon D70 so original RAW files are 5-6mb in size. After doing some basic post processing when I export the pics at "full size" with picture quality of 11 out of 12 then the resulting JPEG is about half the file size of the original RAW file. For example a 5.6mb RAW becomes a 2.6mb JPEG. The resolution in pixels per inch and and the overall image size remain unchanged. Have I lost picture quality due to the exporting JPEG being smaller in file size?
JPEG is a "lossy" file compression algorithm. Whether Aperture or PS, *every time a JPEG is saved some loss occurs*, albeit minimal at the 11 or 12 level of save, huge losses at low save levels. Some images (sky, straight diagonal lines, etc.) are more vulnerable to showing visible jpeg artifacts.
My friend who works with me prefers to edit in Photoshop and when he follows the same workflow his saved JPEG from the identical RAW file in Photoshop is minimally smaller in file size, say 5.6mb to 5.3mb. He's telling me that my Aperture edited photos are losing quality and resolution.
*Both of you are losing image data when you save to jpeg.* IMO the differences between the apps is probably just how the apps work rather than actually losing significantly more data. The real image data loss is in using JPEG at all!
Is he right, are my pics of lesser quality due to being a smaller file size?
I doubt it.
I've always been told that the quality of a picture is not in the mbs, but the pixel density.
The issue here is not how many pixels (because you are not varying that) but how much data each pixel contains. In this case once you avoid lossy JPEG the quality mostly has to do with different RAW conversion algorithms. Apple and Adobe both guess what Nikon is up to with the proprietary RAW NEF files and the results are different from ACR to Apple to Nikon. For my D2x pix I like Nikon's conversions the best (but Nikon software is hard to use), Aperture second and Adobe ACR (what Photoshop/Bridge uses) third. I 98% use Aperture.
I tried changing the picture quality in the export menu to 12 out of 12, but the resulting JPEG then becomes larger than the original RAW at over 7mbs. Can someone please help me understand this better? I don't want to lose picture quality if that is indeed what is happening.
JPEG is a useful format but lossy. Only use it as a _last step_ when you must save files size for some reason and are willing to accept the by-definition loss of image data to obtain smaller files (such as for web work or other on-screen viewing). Otherwise (especially for printing) save as TIFF or PSD which are non-lossy file types, but larger.
As to the Aperture vs. ACR argument, RAW-convert the same original both ways, save as TIFF and see if your eyes/brain significantly prefer one over the other. Nikon, Canon etc. keep proprietary original image capture data algorithms secret and each individual camera's RAW conversion is different.
HTH
-Allen

Jpeg quality when exporting

Is there a way to adjust the jpeg quality when exporting or editing? I can change the image size, which is helpful, but it would be nice if I could change the jpeg compression in order to reduce the file size. Thanks!

Hi Stanleydad,
i noticed from you other post that you are using AOL.
In iPhoto Preferences, have you chosen AOL as your email client.
Once you do this, when you choose an images within iPhoto and click the email icon, iPhoto will open your AOL mail client and attach the photos with the size you chose in the export dialog.
You might even want to make a new post that is all yours so it is easier for us to address all your needs.
Give us the version of iPhoto you are using, the Mail client (AOL) and any other information on what you want to do and we will tell you how to accomplish it.
Lori

Why would I want to change JPEG quality of photos when exporting them from iPhoto?

Why would I want to change JPEG quality of photos when exporting them from iPhoto? Changing the quality of the print changes the size of the saved file and thus impacts the speed at which it is moved on the internet. But other than size of the file, what is the advantage of changing the quality?

I have no idea why you would want to do anything
Some people want lower quality to reduce file size for different reasons
It is an option - if you do pot want to do that do not use that option
LN

Jpeg quality on export

I am experiencing a problem with the quality of the jpegs I get when exporting from Aperture. What I want to do is export adjusted NEF files to jpeg at the highest quality but at a reduced size to fit within 950x950. I have a preset arranged and the exported file is at the correct size. The resulting file however is not as sharp as I would expect and often has indistinct but readily visible flaws (almost as though the pixels have not been perfectly put together).
The same file exported from a trial version of Lightroom 2 are pixel perfect and visibly sharper. I have been viewing both exported jpeg files in Preview. I really like Aperture and use it a great deal. I do however need to sort this problem out asap.
I would be very grateful if you have any ideas on how to resolve the matter.
Thanks.
Simon.

Thanks very much for your input Ian. Here are a couple of examples. Small differences to be sure (although I have seen worse than this), but visible nontheless. I would look particularly at the rendering of the sea near the rocks on the left of the picture
Aperture:
http://swjones.onexposure.net/photos/6098/aperture-version/
Lightroom:
http://swjones.onexposure.net/photos/6099/lightroom-version/
Both images had the same export presets.
Thanks again, any help gratefully received.
Simon.

File size and quality of images from iphone to mac to exported jpeg

there is a lot of good info on this forum regarding jpeg compression, iphoto export etc but i want to confirm a couple things..
i have 'my photo stream' enabled so that i can upload my iphone photos to my mac and my plan is to use iphoto (im just starting to do this)...
yes, i understand that the 'image' taken by iphone is stored as 'data' and some of that data (and potentially pic detail/quality) can be lost/reduced/discarded when you ask an application to export a .jpeg with a high, med, low compression applied.
am i correct that this 'my photo stream' process is not removing any image data?
e.g. i can export a 'full size' jpeg from the iphone and i see a 3.2MB file. if i look at that photo in Iphoto and export original.. i get a 3.2MB file. i assume that the original image was only compressed once?.. when it was originally stored on my camera roll in the iphone?
If i just want to use iphoto to add tags, description... i am required to recompress the image into a file and my choice of MAX compression yields 10MB (which is more space but no more detail vs HIGH compression which yields a 1.9MB file (which most likely is less image detail). there is no way to get the same original 3.2MB amount of data but with the appropriate text fields added into the new jpg file ? would it be much better, at least in theory, if i could get the goldilocks file size, ie just enough compression to have a similar file size as the original ... seems like my choice is 50% less or 300% more ?!?

am i correct that this 'my photo stream' process is not removing any image data?
Yes, as long as you have iPhoto's iCloud preference pane configures as follows:
You're be getting the full image file, pixel dimensions, etc. which is essentially a bit by bit copy of the photo on the Phone.
When you add tags and other metadata and export the file out of iPhoto as a jpeg with the checkboxes selected to include that metadata there will be some image compression. However, if one chooses High or even Medium JPEG Quality one will be hard pressed to detect any image degradation unless printing very, large prints or otherwise displaying the image at a very, large size.
I ran a test on a 1.4 MB photo from my iPhone and compared the original to two exports, one at High and the other at Medium JPEG Quality and got these results:

Quality loss exporting jpeg and PDF to jpeg

Mac OS X Version 10.6.2/2.66 GHz Quad-Core Intel Xeon/Snow Leopard
Creative Suite 3
Trying to get an understanding on why the difference in quality when creating a JPEG from InDesign using 2 different methods.
1st Method (best quality—Sharp & Crisp):
InDesign/Export JPEG
Export settings:
Quality: Maximum
Format Method: Baseline
Resolution (ppi): 300
Open in PhotoShop/ Save as JPEG
2nd Method (looks washed out):
InDesign/Export PDF [High Quality Print]
Open PDF and Save As JPEG
I used default settings except changed
Conversion:
Colorspace: RGB
Resolution: 300 pixels
Thank You to all responding!

Just thought i might add that i have encountered this same problem and that if i want a high quality jpeg i save as pdf then, open and re-save as jpeg in photoshop.
I never knew my jpeg's weren't top quality until a customer informed that my jpegs were not of as good quality as jpeg's received off other designers they use.
Unfortunately i have no fix for you, but thought it may be of interest to know its not just you!
Andy Barrington

Exporting JPEG = loosing Noise reduction and sharpening, poor quality compare to RAW

Hi guys,
I bought LR 5.0 not even a month ago and I was so excited to use it.
Now that I am done working on my projects I exported them as JPEG into my hard drive. This is a disaster. My pictures are amazing in my lightroom as RAW now you should see what they look like in JPEG. I can't believe it. I obviously did something wrong but I can't figure what it is. My JPEG pictures looks extremely grainy. I did shoot at a High ISO for most of them. It is probably the real problem here but there's certainly a way to make it work in JPEG since it looks good in RAW. Please tell me what to do from there. How can I keep the same quality in JPEG than I already have in RAW? I choose JPEG - quality 80% or 100% (tried both) - sRGB. Should I resize the image too?

Are you applying export sharpening, which would exacerbate any remaining noise-grain? Are you judging the sharpening and noise-reduction at 100% 1:1 zoom? You have to, otherwise, the resampling-for-display algorithms in LR and your OS viewer might be doing something completely different.

IPhoto09 Export has both a "JPEG quality" and a "Size" option

In iPhoto09 Export has both a "JPEG quality" and a "Size" option. What is the difference? iPhoto Help does not clarify. Size seeems to constrain the size of photo on screen, and it is not stretchable. 300 dpi no matter what options are selected.

Jpeg Quality is the amount of compression applied to the file.
Size is the dimensions of the shot - length by breadth - measured in pixels.
There is no dpi setting, nor any default setting for dpi. Dpi is sent when you decide the dimensions of the photo when you print.
Regards
TD

Export 100% quality photos with metadata?

I've spent hours searching the web and this forum but can't figure out how to do this.
SUMMARY:
How do I export a set of photos from iPhoto '09 while preserving the photo's image quality and its metadata? I want a 100% identical copy of the photo to be exported.
DETAILS:
I've noticed throughout this forum that when people ask how to move their photos to another computer or to use with a different photo tool, whilst preserving metadata, the normal answer is to use File-->Export. The problem, I'm finding, is that you don't get an exact copy of the photo that's in iPhoto ––OR–– you don't get the metadata included with the export, depending on which export choices you make.
1. If you choose to Export the photo(s) in Current or Original, then you get a 100% quality photo but you don't get all the metadata: Location, Keywords, Title. (You do get the original metadata that was put there by your digicam or scanner prior to importing into iPhoto, however.)
2. If you just drag the photo(s) out of the iPhoto window, you get an identical copy of the original without the extended metadata, as in the previous method.
3. If you choose to Export the photo(s) in JPEG, then you can include the Location, Keyword, and Title metadata. However, the exported photo is not the same size as the original.
- JPEG Quality: High results in photos that are about 1/2 the size of the original.
- JPEG Quality: Maximum results in photos that are about TWICE the size of the original.
I don't really understand what it means to take a 2 MB JPEG iPhoto original from my digicam and export it in Maximum resulting in a 4 MB JPEG copy. All that extra size surely cannot be worth anything, as the best you can get is what was in the original. So you're doubling the size for no benefit. Actually, it seems likely that the copy is WORSE than the original because of lossy file-format conversion errors, similar to why it's a bad idea to convert a 128kbs AAC song to a 128kbs MP3 song in iTunes, or make a copy of a cassette tape (for those of you old enough to remember analog).
The Crux Dilemma: It appears that I can EITHER
1. export a 100% identical copy of my photo but lose my extended metadata,
2. export a modified (either 1/2- or Double-size) JPEG copy that has all the metadata.
This is frustrating me. My friends and I took hundreds of pictures. I've imported them into iPhoto, edited them, Keyword tagged them, GeoTagged them, and now I want to give them their 100%-quality copies of the photos, and I can't figure out how to do it.
Any suggestions?
Thanks,
David
Message was edited by: Longwalker

Terence, thank you for your quick reply!
You basically confirmed what I found out by trial-and-error.
Unfortunately, I think the news is bad. Here's why:
A typical picture in my iPhoto library, a JPEG taken by a compact digicam, is 1.8 MB. Let's compare that to the sizes of the same picture when exported using the various options:
1.8 MB - Current or Original; - metadata not included.
11.4 MB - TIFF - lossless, all metadata included
3.1 MB - JPEG Maximum - lossy but all metadata included
0.7 MB - JPEG High - lossy but all metadata included
You wrote "For my money the best bet is the tiff". I know tiff's are the highest quality format (non-lossy), but, in my case anyway, they're 6.3 X larger.
Is it really true that the only way to move my photos out of iPhoto while preserving 100% of the quality and all the extended metadata is to increase the size of my photos over 6 times? Really?
That seems a bit ridiculous. Consider a library of 10,000 photos averaging 2 MB each (which is on the small side these days). That library would be at least 20 GB (not really considering all the additional space used by thumbnails, dupes, etc). But if I want to export all those photos in a lossless way while preserving metadata, the size will jump to over 126 GB!!
Many of us have Macs with hard drives large enough to easily handle a 20GB iPhoto library, but if that library suddenly exported itself into a 126 GB monster, that would challenge many of our hard drives.
Is there really no other way?

White stripes in exported JPEGs

Dear Friends,
I use Windows XP SP 2, Indesign CS 2 (Vers. 4.0.5).
I use the Indesign in-built jpeg export function very often because I need the output for some flash presentation (flash book).
But the output is sometimes distorted with white stripes.
I really hate this - because I can see these white stripes also when I work in Indesign with High Quality View Mode.
To eliminate them I need to scroll the distorted page out of the screen and scroll it into back again.
Then there aren't any white stripes on the screen or in the resulting jpeg-Output of this page.
But for 100 or more pages this "solution" is not practical.
There are workarounds like Apple- or Javascript Indesign-Macros for exporting all pages as PDFs and then converting them back to JPEG in Adobe Photoshop, for example. But the Indesign export-to-jpeg function is very simple, easy, straight-forward and fast. But these white stripes must go away.
Is there an update for Indesign CS 2 to eliminate this problem?
What is the reason for this really annoying problem?
I thank you very much for your help and support!
With best Regards

Well - but when the exported JPEG has to be small - then Photoshop rasters the fonts very unreadable. - Indesign is better in rastering the fonts when it is exporting the stuff directly as JPEG-Files. The font is much more readable then.
Btw.: Is there a way to setup the font-rasterizer of Adobe Photoshop to improve readability of rasterized fonts?
Thank you for your help and support!
With best regards

Exported Jpeg's when sent to photo lab print too dark

I have had consistent results with exported jpeg images that look fine on my monitor (as raw files)and show in the histogram in lightroom 2.5 as the highlights just starting to clip as printing too dark when sent to a photo lab in SRGB. Is this a fault of my monitor? I have calibrated the monitor, a Dell S2409W, using charts on the website at http://www.normankoren.com/makingfineprints1A.html but this still happens. Will darkening the Monitor help or will the images still clip at the same point? I have been able to send a second image with the exposure and or brightness boosted a bit and they print brighter, but this is a pain. What is the best way to correct this so that I can see the same image as I get back from the lab?

hello henrykipson,
you said that you want starting an professional laboratory business,i can talking about this because i had a laboratory until some years ago .i hope that you made some artistic study,so it's more easy for you to learn this topic.you must study,an pass an examination for take an artigianal licence that allow you to open this activity ,the licence given you the opportunity to work either for sale photografic material either to shoot and developing,one time that you had pass this examination you must gone to the police autority and inform these of your business (is under police control.because you work with chemical material,and also because you had a reservate people information,and they must given you their assent.)after all you can start to buy a good developer and print machine beyond to have a dark room.for manual print.you must decided if do you want work in black and white or color.You can do both but is better to specialize by one of them ,like you want.
Remember from the digital events many people print his image at home,you must deciding maybe is better to work with a professional photographer,that can given you more work.itsn't easy.you must have a good preparation because ,they are more exigent.The good results depend also from the quality of your works.a good machine,good chemical product,good upkeep,of your laboratory.(in italy this is the procedure,i think also in other country,because is a ticklish question licence.)I hope that this my little explanation are useful to you.Good luck .
cheers alessandra minotti

Exporting Jpegs from Lightroom - DPI question

When I export Jpegs from Lightroom, I set the dpi to 300 pixels per inch. I do not specify a max width or height. When I view these files in Adobe Bridge (CS2 or CS3) the file info says 300dpi. However, when I open the files in Photoshop and select image size, It says 72dpi and has the document size set to very large. I realize that I can enter 300 dpi and uncheck the resample box, I am just confused as to why this is happening.
My concern is, that I upload my images directly to my lab after exporting from Lightroom. Will this cause problems?
Thanks in advance!
David

the image resolution is a combination of the two parameters you mention: size and dpi. a very large size at 72 dpi is equivalent to a small size (like 3x5) at very high dpi. for printing you want at least 240 dpi at the largest size that allows you to keep that resolution. for screen presentations or your web site you want jut 72 dpi. 72 dpi and 2x3 inches will require a very small file size.
I suggest you to export images at TIFF and not JPEG as that will allow you to preserve the image quality when doing editing in PS.
In my case I export TIFF for PS (when I need PS editing) and 72 dpi JPEG for my web site (that way if somebody downloads my image illegally thy get a poor resolution copy). But since LR works very well for me 90% of the images re just kept in raw mode and I print from LR.

Export JPEG quality must be chosen twice

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