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09/26/2006 09:29:03 PM · #1 |
Is it possible to touch-up and resave a JPEG file without losing quality (or at the minimal)? How?
crayon |
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09/26/2006 09:32:21 PM · #2 |
The absolute answer, no.
Every time a jpeg is saved the compression algorithm is applied. To minimize the reduction in quality save at the highest quality for least compression.
But really, save as another jpeg or even better, tiff to preserve quality.
Message edited by author 2006-09-26 21:33:09. |
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09/26/2006 09:33:36 PM · #3 |
Save it as a Photoshop (.PSD) file while you're editing, and then save a copy as a JPEG at the highest quality setting -- that's the best you can do if starting with a JPEG. You can save a composite (flattened) version of the .PSD file -- e.g. for sharpening -- as a TIFF file, either with or without LZW compression, without compromising quality any further. Then save that TIFF as a JPEG. I've heard that the highest JPEG setting (12) in PS CS is lossless compression; if so, it would not cause a problem to re-save a JPEG.
Message edited by author 2006-09-26 21:35:15. |
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09/26/2006 09:43:10 PM · #4 |
don't mean to but in but i find that my photos shot in jpeg saved as a new name at 12 then i resize and save for web almost always at less than 100% end up grainy or out of focus looking does anyone know why?
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09/26/2006 09:48:29 PM · #5 |
Originally posted by rider:
... resize and save for web ... |
I think that those steps are the likely source of any problems ... |
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09/26/2006 10:31:41 PM · #6 |
Originally posted by rider:
i resize and save for web almost always at less than 100% end up grainy or out of focus looking does anyone know why? |
Always apply a touch of USM after you resize for web. Try something like 60% / 0.8 / 4 and see what you think. Of course, each image will vary, but that should be a good starting point.
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09/26/2006 10:57:01 PM · #7 |
I do my resize within save for web without a blurring issue.
If resizing before using save for web then an application of some sharpening is in order. |
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