Okay, I am feeling like the Bear with Very Little Brain. May I try to play back what I've understood, to see if it crossed the confusion barrier?
1. If I run PSP's batch conversion on my newly downloaded jpeg files, I am
not opening and resaving the jpeg, so no loss is introduced to the jpeg file.
2. If I need to go back to my "negative" copy, open it and make a second copy of it, that still does not constitute an editing or saving action, so the jpeg is unaltered.
3. As I review the newly uploaded jpegs (this is the second batch, the one that I took from the card reader and copied onto my hard drive), I can open the jpeg file, then close it---without rotating it or editing it in any way---and it will still be in its pristine condition because I didn't
save it. Closing a jpeg and saving a jpeg are two different operations.
I'd appreciate it very much if anyone could confirm that I "got" what you've said, or set me straight if I didn't. This is enormously helpful, because I have been making mistakes in overhandling jpeg files AFTER processing them in PSP and reconverting them to jpegs for posting on forums.
Thank you very much for your gracious assistance.
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