Saving JPEGS Many Times After Making Many Changes
Sep 8, 2016 15:37:19 #
Sep 8, 2016 15:47:50 #
wdross
Loc: Castle Rock, Colorado
jerryc41 wrote:
That is exactly what I did. I selected a picture, modified it, saved it with a different name, and closed it. I repeated that process 100 times, and I have 100 very similar images. I renamed the first one "First Picture" and the last on "Picture #100."
I didn't do this to generate controversy, just to show what happened after I made 100 changes and saves. If you use a different procedure, you would probably get different results.
I didn't do this to generate controversy, just to show what happened after I made 100 changes and saves. If you use a different procedure, you would probably get different results.
Thanks Jerryc41 for the feedback. Your software did an excellent job of preserving the original image. I know for most of my processing I never like going past three generations of JPEG. It almost aways starts generating artifacts that I don't want, but then again I am sometimes too much of a pixel peeper.
Sep 8, 2016 16:35:27 #
wilsondl2 wrote:
Did you not read he modified each time? - Dave
The devil is always in the details. The KIND of modification is what counts.
Sep 8, 2016 17:07:24 #
more fuel for the fire... or not
https://www.youtube.com/watch?v=w7vXJbLhTyI
I'm guessing that most photographers will not go back to work on a photo 9000 times
https://www.youtube.com/watch?v=w7vXJbLhTyI
I'm guessing that most photographers will not go back to work on a photo 9000 times
Sep 8, 2016 17:33:44 #
les2297 wrote:
more fuel for the fire... or not
https://www.youtube.com/watch?v=w7vXJbLhTyI
I'm guessing that most photographers will not go back to work on a photo 9000 times
https://www.youtube.com/watch?v=w7vXJbLhTyI
I'm guessing that most photographers will not go back to work on a photo 9000 times
Good video, degradation easily seen in JPG even at 50 generations. The reality is it starts sooner and may not be visible on an image on the web.
Even 50 separate edit sessions on a single JPG image may even be a stretch, but facts are facts.
Sep 8, 2016 18:55:58 #
Sep 8, 2016 19:28:13 #
jerryc41 wrote:
Then my work here is done. 
Good job with the test and the objections. I see no difference in any of the images in this post. Sorry about losing your dog.
Sep 8, 2016 22:22:40 #
zigipha
Loc: north nj
jerryc41 wrote:
Does it really matter?
Yes..if the changes were subtle then there would not be much changes in the levels so the compression would keep doing a good job.
Sep 9, 2016 04:00:41 #
jerryc41 wrote:
We've all heard that every time a JPEG is modified... (show quote)
I have not read all the replies, and I think it probable that someone else has also said what I am going to say - if so - apologies.
Saving a file (over-writing) makes no difference to what you have on the screen. Once you close the screen you lose it. When you open the newly saved file you will see that it was compressed on saving. If you further edit and re-save (over-write) it will be further compressed. Close the screen and you will be left with that further compressed file.
Do that 100 times and you will not recognise what you have left is a picture.
Sep 9, 2016 09:13:22 #
larimarpugs wrote:
Puggies are just as fat in each photo.....really cute guys....
Not fat - pleasantly plump.
Sep 9, 2016 13:28:58 #
wdross
Loc: Castle Rock, Colorado
jerryc41 wrote:
Not fat - pleasantly plump.
I just don't understand all the comments about the picture. This is a very (1), very (2), very (3) dog of a picture!
Actually, we think our furry "teenagers" are cute too. And sometimes they are just as active as yours in the picture. And it will away be a heartfelt lost when one has to go away. At least you will have the memories.
Sep 9, 2016 17:49:05 #
even in the winter I never edit and save many files more than 4 times.
Sep 10, 2016 02:58:20 #
bull drink water wrote:
even in the winter I never edit and save many files more than 4 times.
"even in the winter"? does this mean that you have more time for editing in the winter? or do your winter exposures require more editing?
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