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01/19/2005 08:08:12 PM · #1 |
I know that repeated editing and saves of a picture in JPEG format will eventually result in some deterioration. However, what effect does something like running de-frag, or backing up to a CD and then restoring to the hard drive have on the picture quality? I've been told that de-fragging or restoring from CD has no effect because the picture is not being put through the compression routine. True? False?
Thanks in advance for your replies/advice.
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01/19/2005 08:19:33 PM · #2 |
Originally posted by Norris:
I've been told that de-fragging or restoring from CD has no effect because the picture is not being put through the compression routine. True? False?
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The only thing you need to worry about is opening and re-saving the image in an image editor. Any other file system operations should be perfectly safe with regard to image quality. Go ahead and defrag your heart out :)
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01/19/2005 08:40:21 PM · #3 |
Your original image has a number assigned to it by the camera: DSCN_xxxxxxxx is what mine gives. As long as you NEVER "save" that image it remains uncorrupted. Whenever you open the numbered image, immediately do a save-as and save it as a psd (native photoshop) image, or whatever the equivalent is in your editor. You want to be working on a lossless format, not a compressed format.
Moving images from one location to another has no effect on their quality, UNLESS you are compressing your archives, which I don't recommend.
Robt.
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01/19/2005 08:45:33 PM · #4 |
| archive formats are lossless you loose nothing in the compression -- but depending on your files it may not save you any (or very little) space. |
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01/19/2005 08:46:06 PM · #5 |
Never work on an original, always work on a copy. Save the copy as Tiff after you are done with it.
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01/19/2005 08:47:58 PM · #6 |
Originally posted by bear_music:
Your original image has a number assigned to it by the camera: DSCN_xxxxxxxx is what mine gives. As long as you NEVER "save" that image it remains uncorrupted. Whenever you open the numbered image, immediately do a save-as and save it as a psd (native photoshop) image, or whatever the equivalent is in your editor. You want to be working on a lossless format, not a compressed format.
Moving images from one location to another has no effect on their quality, UNLESS you are compressing your archives, which I don't recommend.
Robt. |
I have another method that works better for me, as soon as I transfer the photos from the camera to my hard drive a copy is made to my archive drive, these never get edited. I do this because there are things that I can do to a photo that seem innocent but I really donĂ¢€™t want to do on the original, like rotate the photos. It is all to easy to be in ACDSee and be looking through the photos and see one that needs to be rotated and rotate it without thinking. The photo is not opened in this case. So for me I am less likely to mess up if I make a copy right off. It is also easy to do this in Windows XP. Whereas the rotating may not seem like much it in most cases the photo is recompressed.
But however you do it make sure you always keep a copy of the photo exactly as it comes out of the camera.
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01/20/2005 02:49:32 PM · #7 |
At high quality settings repeated resaves of jpegs have been shown to have almost no discernable effect. If you're talking about saving a few time beteen edits then don't worry providing you save at the highest quality.
Copying or moving a jpeg has NO effect as it is not being reencoded. Defragging likewise has no effect.
Message edited by author 2005-01-20 14:49:47. |
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01/20/2005 03:04:29 PM · #8 |
Originally posted by zarniwoop:
At high quality settings repeated resaves of jpegs have been shown to have almost no discernable effect. If you're talking about saving a few time beteen edits then don't worry providing you save at the highest quality.
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Not sure I agree with this in all cases. If you took a 6mp image, and are only print a 4x6, then you're probably right. But if you're doing 8x10 or 16x20, or any kind of good size print, then you want to do one and only one save, or start by converting to TIFF.
LIttle things really do make a difference in many images.
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01/20/2005 03:18:01 PM · #9 |
Scott,
That's what I am saying. I keep the originals untouched, in a separate folder, one for each shoot, dated. Those folders are archived. When I make "finished" images that I print and sell, I also archive those images as well.
Robt.
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