I use IrfanView (IV) since support of FilterFactory (
http://www.photoshop-filters.com/html/filter_factory.htm). Can be before 2000.
From time to time a problem occurs and keeps for some time. It's always the same problem and I don't know how to get rid of it. When it's gone again, that's by accident and not by my intervention.
I asked for advice at VPF.com several years ago, googled, read at IV support forum, but didn't find an answer. About 2 months ago the problem occured once again and the last times I used the affected task of IV, the problem was still there.
The problem is this: I take a screenshot to clipboard just using the print button of the keyboard, open IV and insert screenshot from clipboard to a new pic in IV, cut out a part of the pic and insert it to a new pic in IV, then save it in *.jpg (without to save anything in between). When I reopen the saved pic, white is changed to light blue.
I just tried it with the PN standard forum colour theme, because of the white and different blue tones, but actually it seems to be gone.
Some may remember the thread at VPF.com, where I posted examples, on which you could see the difference and the diffence was measurable with the colour picker (?) from another program.
I never found out what's the trick and I would be happy to know the trick for the next appearance of the problem. I'm sorry (no, I'm happy) I can't post an example.