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06/26/2004 09:58:27 AM · #1 |
I have very limited experience with Adobe photoshop so I'm hoping this question doesn't come across as being too dumb to the photoshop gurus :) Anyway, I've been altering a couple of shots that contained redeye with photoshop and have upto now been doing it quite successfully. Through doing this task though I've noticed that when I open the original image file it is roughly sized at about 550K, but once the editing has been done, and I've gone through save as, chosen the highest quality, the file size seems to drop in size by roughly 100k. Why is the image being reduced in size? Does this affect the quality of the image because I can't really see any changes?
Thanks in advance |
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06/26/2004 10:11:26 AM · #2 |
The most likely explanation is that the JPEG compression algorithms in cameras are not nearly as powerful (in terms of computational complexity) as they are in Photoshop. A 2.4GHz Pentium 4 can come up with an optimal JPEG compression quite quickly; the small microprocessors in consumer digicams don't have the power to achieve the same level of compression.
That being said, if you aren't seeing a perceivable difference in quality, either from prints or when viewing the images at 100% on-screen, then I wouldn't be too concerned. As a matter of fact, you may be able to use a JPEG level of 9 or 10 instead of 11 or 12 and save even more space, since at those upper-end numbers, some of the space-saving benefits of the JPEG algorithms are mitigated. |
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06/26/2004 10:23:08 AM · #3 |
Interesting! Thanks Eddy. As previously mentioned I'm not seeing any difference in quality afer editing so its obviously not something to be too worried about. I just wanted to be assured nothing seriously wrong was happening with the reduction in size ;)
Thanks again |
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06/26/2004 04:43:21 PM · #4 |
i'd be interested in hearing in more detail the steps you are taking. i've always found that saving at highest quality (lowest compression) in PS results in LARGER images than the original. and ~20% reduction sounds drastic...
are you saving for web?
-O.
Message edited by author 2004-06-26 16:44:26.
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06/26/2004 08:59:07 PM · #5 |
They always get larger for me too. If you do anything to reduce details or colors (such as invoking NeatImage, using Dust & Scratches, or desaturating), the image can be compressed a lot more even at high quality.
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