How to maintain pixel size when exporting?

When exporting an edited image (ex: 20 MB) from Aperture to a desktop folder, I choose file>export>versions>jpeg original. When I open the exported image in the desktop folder (it opens in preview), the Tools/Inspector window says that the image is now only 2MB. This has not always happened. Can someone tell me what I might be doing or not doing that is causing this, or what settings I need to change?
Thank you.

golindy,
JPEG is a lossy format that relies on two ways of reducing the file size. The first is the lossy part that throws away data that is percieved to be unimportant for human vision, the resulting data is then further compressed losslessly using the same type of compression zip uses (this is why zipping a JPEG doesn't lead to further size reduction).
The more you throw away in the first part, the more likely the image is to suffer from 'compression artefacts'. The number you select on export determines how much data gets thrown away.
I don't know what '12' officially means for Apple, but from eyeballing files, it seems like it throws away pretty close to zero. So a file output with 12 is top quality.
Aperture has always worked the same way here, it hasn't changed during any update.
However, some things that may affect it are:
1) The effeciciency of the both compression algorithms seems to improve over time.
So a year ago, a 20 Mega Pixel image might compress down to a 5MB file using a quality setting of 10. Today that very same file may compress down to a 4MB file at quality 10. But it's important to note, the quality of the file will be the same, quality 10. All that has happened is the more efficient algorithm has allowed an extra 1MB of file space saving.
2) The raw converters periodically get improved with new rendering. One area that has continually improved in Apeture is noise supression and more natural sharpening.
These impact the first part of the compression process. A noisy image with harsh shapening will compress less than a clean image with more subtle sharpening. So better raw processing can also impact the exported size. Note, this one works in both directions, an improved conversion that resolves more details will output a larger file size, whereas an improved conversion that gives less noise will output a smaller file size.
So in your case, I think what was happening was you were not losing quality, just gaining file size efficiency, and now you have changed to quality 12, you are exploiting that file space saving by now outputting higher quality files.
Andy

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sunhotmoon wrote:
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How to maintain pixel size when exporting?

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