GIMP Version: 2.10.9
Operating System: Windows
GIMP Experience: New User

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Sometimes, when I want to open an image, I have this:



and I do not know what is best??

The advice I read is stick with the profile that comes with the image.
Although if sending off for printing, where the printing company specifies a colour profile (something.icc) use that.

There are plenty articles around on the subject but these tend to very technical. example: https://ninedegreesbelow.com/photograph ... rison.html

All to do with colour gamut - the number of colours that can be used. RGB used for colour displays is less than the human visible spectrum but more than that used for printing (CMYK). Often displayed as a curve such as this: https://i.imgur.com/FFEEEGQ.jpg

I would not worry about it too much. Most computer users do not have a colour-calibrated monitor that accurately reproduces colours.

As it happens there is no real difference between sRGB (built-in).icc and sRGB IEC61966-2-1 black scaled.icc but there are others where there is a difference and you might see a small change in the colours displayed.

The graphics application Krita has a nice visualization function. This compares the two mentioned and a third Adobe RGB (1998).icc https://i.imgur.com/yyFxlv0.jpg

Thank you rich2005, for explanations and links, because not knowing what was best, I always chose "convert", more than once with "keep", Gimp had been frozen.