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I didn't need to make any changes since I every time chose "save as" and overwrote the old file with the same name. I can not just "save" without changes, so that is the same for us both.
I am going to have classes in "digital images" in a couple of weeks in school. I must remember to ask my teacher about this, maybe he knows more than we do, maybe not...
It is however one thing we might have overlooked. Or at least I. The "rule" I've heard is that even if your camera saves images in jpg, you shouldn't do it yourself. Not even to change the name. And to get the images the same size without ruining the original photo I had to save a new file with the supposedly "fresh" image. So maybe the things we don't see on the screen disappeared already then. Anyways, it would be nice to know the answer to this query now that we both spent time thinking about it.
I'll post again if I get new information or insight...
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