Discarding jpegs due to multiple edits?
Apr 4, 2019 00:42:32 #
Dragonophile wrote:
Thanks!
Thank you for your patience. I think we may have safely negotiated the raw versus JPEG minefield!
Lots of good (and reliable) info from CHG_CANON.
Mike
Apr 4, 2019 06:36:55 #
CHG_CANON wrote:
Nothing. Copying a file has no impact on the contents, not on text files, not on webpages, not on RAW files, not on database files, not in BITCOINs, not on JPEGs, not on any sort of electronic file type. The entire IT industry would fail if making copies of files presented any risk of modification to the content of the files.
Apr 4, 2019 07:22:51 #
When editing JPEGs do NOT edit and resave the original - make the edited image a "Save as..." (a new name) and then only edit that.
Apr 4, 2019 07:23:29 #
Dragonophile wrote:
I have read/been told that every time you edit a j... (show quote)
It's "editing and saving" that causes degradation. However, I edited and saved one picture over one hundred times, and I couldn't see any degradation. When I posted the results here, some people said that I hadn't made enough changes, or something similar, so the test was invalid. I couldn't see a change in quality after editing and saving one hundred times, so that's good enough for me.
Apr 4, 2019 07:23:50 #
BboH wrote:
When editing JPEGs do NOT edit and resave the original - make the edited image a "Save as..." (a new name) and then only edit that.
Right! Always keep the original.
Apr 4, 2019 07:32:44 #
StevenG
Loc: Long Island, NY
rmalarz wrote:
https://petapixel.com/2010/02/04/saving-jpeg-photos-hundreds-of-times/
--Bob
--Bob
Very interesting!
Steve
Apr 4, 2019 08:21:08 #
rmalarz wrote:
https://petapixel.com/2010/02/04/saving-jpeg-photos-hundreds-of-times/
--Bob
--Bob
This article is based on 500-600 edits and saving on top of each other. I highly doubt ANYONE would actually do that!
Apr 4, 2019 08:23:36 #
DanielB wrote:
Just like RAW files you should never work on an original file - make copies. Yes jpeg is a lossy file and is already compressed. Too much manipulation will degrade the image. Minimal manipulation is best and only on a copy of the original. That way you can always go back, make another copy, and start over if you screwed up. That's this man's opinion anyway.
I definitely agree with this policy.
Apr 4, 2019 08:35:49 #
Dragonophile wrote:
PLEASE, I DO NOT WANT A RAW VRS JPEG DISCUSSION. I... (show quote)
Sometimes I go back to old images, and with my newfound editing skills, that old JPEG can be made better. I have never noticed degradation even after 5-10 edits. I don’t heavily edit, so this may not be a complete answer for you.
I used to shoot only JPEG, and, in fact, some of my older cameras didn’t have a RAW choice. Now, I shoot only RAW, but I still have hundreds of JPEG files that I have edited in a variety of software programs and they were ALWAYS improved, even at an 8x10 print. I rarely print larger than that. No degradation to MY eyes!!
I find this topic interesting, though, because I plan to print a mural that will be at least 24x60, and a print I am considering is JPEG. But that is a topic for another post.
Apr 4, 2019 08:36:19 #
tomad
Loc: North Carolina
I shoot highest quality jpegs, then edit but save at highest quality to a different file so the original jpeg never degrades. I also save the edit file from the editor so if I need to edit again I open that and it opens the original file with previous edits already applied. No degradation. If I am going to edit a file in more than one editor I save the first edit as a tiff file so that it can be edited by other editors with no degradation. After the last edit I save at the highest quality jpeg.
Apr 4, 2019 08:46:25 #
Dragonophile wrote:
I have read/been told that every time you edit a j... (show quote)
Every time you save a jpeg you loose information even if you have not made any edits. Saving as a JPEG applies compression algorithms to the file. SO even if you have made no changes the save process will alter the file and re-compress the file resulting in degradation. If you edit a jpeg, save it to a new name. If you want to do something different, go back and edit the original and save the new edits under another new name. That way you are always starting with the same information.
Apr 4, 2019 09:08:31 #
davyboy
Loc: Anoka Mn.
Dragonophile wrote:
PLEASE, I DO NOT WANT A RAW VRS JPEG DISCUSSION. I... (show quote)
Never really noticed any degradation
Apr 4, 2019 09:09:21 #
gvarner
Loc: Central Oregon Coast
Always make a copy and edit that. There are multiple ways to do this within most editing programs.
Apr 4, 2019 09:20:32 #
DanielB is correct. The easiest way to edit JPEGs and protect yourself from degrading the image, it will degrade if you make a lot of changes, is to start with a duplicate JPEG. Save the original JPEG, and if you make to many edits to the duplicate simply erase it and start over with a second duplicate image.
Apr 4, 2019 09:23:25 #
If you copy, nothing. If you save, lossy.
--Bob
--Bob
SteveR wrote:
So here's a question.....what happens as you save jpegs to backup drives.
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