File size in Aperture

I am a new Aperture user. When I try to attach photos from Aperture to an email, the file size is significantly decreased (5.4 MB down to 617 KB). This does not happen in iPhoto. I tried "exporting" to the desktop in original size and then attaching but it still decreases file size (5.4 MB down to 1.6 MB). Anyone shed come light? Thanks in advance.

There is an Aperture forum but
When I try to attach photos from Aperture to an email, the file size is significantly decreased (5.4 MB down to 617 KB).
This is because you're attaching an Aperture Preview to the email. You can increase the quality of the Previews in the Aperture preferences.
I tried "exporting" to the desktop in original size and then attaching but it still decreases file size (5.4 MB down to 1.6 MB).
Don't mean to be rude, but Aperture is a very powerful and quite a complex app and really you do need to RTFM sometimes.
Original Size refers to the dimensions (length by breadth) not the File Size. The File size is determined by the Export Preset you use, and whether or not you're exporting Masters or Versions.
Regards
TD

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MacDLS,
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Hey Everyone,
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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.
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Is he right, are my pics of lesser quality due to being a smaller file size?
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HTH
-Allen

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Hi
I am submitting some photos to a contest with max file size 500k and 1000 pixel max per longest side. I am getting VERY different file sizes from Aperture than Photoshop. If I export with 1024*1024 setting I get a jpeg file 205k , 1000*667, 72dpi. If I open that same file in PS CS4 the image size dialogue box says it is 1.9M. When I "save as", no changes, it is 410k, 1000*667, 72dpi. (double) Lastly, if I export the original raw file from Aperture with Tiff 300dpi settings then resample to
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thanks
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Ahhh. Ok. So, if I don't need to make adjustments in PS and can export directly from Aperture that may be the most "consistent" solution. Unfortunately some of the images are pre Aperture Tiff files already adjusted in PS so I will do those in PS and keep reducing the pixel dimensions until I land under 500k in the finder get info.
I get different results printing from Aperture 3 (muddy looking) than I do from PS so am used to exporting to PS and working there. Might not be the best route for this exercise as the Aperture jpeg fits nicely inside the 500k requirements.
Thanks again.

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Well that's interesting Ernie. I did as you said, but also exported an image while I had the settings at 4288 x 4288 pixels. The resultant file size at that setting is 1.4MB. The file size when I went back to 'original size' is 795KB, exactly the same as before.
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Sorry Leonie - I didn't answer your question - they haven't given me a specification for pixel size as in 4288 x 4288: only 300 & 72dpi, a file size of 1-3MB, and a they must be JPGs.
And thanks for your help Frank - I've tried starting out with JPGs and with TIFFs as the photographer supplied me with both. I'd cropped some of the images but not others. I appreciate you offer of having a go with my images, but I think that - as I can go to over 100% - I've got it sorted now! Just hope there's no deterioration in image quality.
Many thanks everyone!

Shedding light on export settings and file size

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Can someone please shed some light on how to go about exporting images so that I can be certain that I am exporting the best quality image possible.
Also, and possibly more importantly, I export image files to sites like MobileMe Galler, Flikr and Phanfare, etc, for the purpose of archiving my images and now I am not sure if the files I am exporting are of the optimal most quality they can be. Do these settings have any bearing on the images that are being sent to my archival folders?
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Mac

This confusion is because of the way Jpg files handle data. Jpg is a kind of file that compresses data to achieve a balance between image quality and file size. The jpg file that your camera saves to disk is also compressed, that's why the difference in size between a 2 MB jpg and the same image in Raw is for example 18 MB.
Jpg is a lossy compression format, every time you save a jpg some compression is applied, say after editing in Photoshop. Aperture must be reading your jpg masters to export jpg files to disk, so the difference in size should be the compression quantity applied to the newly created jpg file. I could have a 1 MB jpg file previously compressed with a quality level of 7, but if I export it at a compression quality of 10, the file could easily become a 2 MB file. The problem is quality doesn't increase with file size when the original file is a jpg.
Also some files include a preview image inside the file, increasing the final file size. The color profile embedded should't increase size by much, since most camera jpg files already include a color profile embedded (color profiles tells computers to display color consistently between applications and peripherals like printers. sRGB is widely used for images published on Internet).
As for the images you are sending to the archival folder, I would suggest you to export the masters, instead of exporting a new jpg file from an already compressed jpg master.
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What file size is used for when uploading to MobileMe from Aperture?

When I upload my photo files from Aperture (and previously from iPhoto) I routinely use the upload setting named "dowloading of optimized" files. I know that this downsizes the files for faster upload/download, but still gives a file size acceptable for great onscreen presentation and for a resulting small print of someone downloads. Can anyone tell what downsizing Aperture does in this case? For example, 50% jpeg, email sized jpeg, etc. Since Apple will kill the MobileMe galleries in June I have to switch to another photo presentation host. For upload to such a host Aperture gives choices like 100% jpeg, 50% jpeg, etc. What I want to do is end up with something similar to what I now get with the "optimized" setting. Thank you.

You will note that I referenced both programs (iPhoto & Aperture) in my original message above, and I have posted in both forums. Since both programs offer the same (at least on the surface) option of "optimized" to MobileMe galleries, one might assume that both use the same or a similar system. Lengthly testing of my own is the "best" solution only if I can not find anyone who is knowledgeable about what these programs do in the upload. It has been my sincere joy over many many years that I often find people on these forums who possess knowledge much greater than I. As to the programs changing the algorithum at any time, I doubt that since this MobileMe function will disappear in June. Seems like a strange time to make changes.

Annoying but not fatal bug uncovered in Aperture file size metadata.

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To my surprise when I was performing this comparison, I found that the file size shown in the metadata panel of the test file was not reduced, even though I had significantly downsized the file (from an "outbound" 72.2GB to an "inbound" file of slightly less than 7GB. So I repeated the round trip to P'shop, using the OSX Inspector to examine the relevant .approject size at three points in the workflow:
1) Before executing the "Open in External Editor" command;
2) After the PSD version had been created by Aperture; and
3) After re-sizing the file in P'Shop and saving it back to Aperture.
The net of the test was as follows:
1) The size of the base (pre-export) .approject increased by approximately 72.2GB when it created the 16-bit PSD file for export to P'shop - exactly what the metadata showed and what I expected for a 5D file at 16-bit color depth.
2) When the resized file was returned from P'shop, the base .approject file was now only 7.5GB larger, indicating the size of the returned file was in fact reduced by the downsizing.
So the problem is not creation of an abnormally large Aperture PSD file. The metadata file size is simply not updated when the downsized file is returned from P'shop.
I submitted a bug report to Apple on this, but I'm not sure what priority it will get. So this is an FYI in case others have observed a similar phenomenon and been concerned about it.
BTW: The file downsized via the P'Shop round trip was noticeably sharper on printing (from Aperture) than the print produced directly out of Aperture. So it appears the print output sharpening routines in Aperture still need considerable improvement. That's the improvement I'd rather have Apple spending their time on than an anoying but not fatal bug in file size metadata.
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PowerMac G5 Dual 2.0GHz, Radeon X800XT Graphics Card; MacBookPro 2.0Ghz Mac OS X (10.4.6) iMac800 and Powerbook G4 also in household

I was trying to imagine how you were managing taking more than a few photographs if your files were increasing the space take by 72GB a pop.
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Good day all:
I have looked for several hours but can't find the answer to two questions:
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