Thanks! But I am quite sure that I do not compress them, how could I find out whether they are maybe inadvertently somehow compressed?
And one more thing: when I load one of the CR2’s into Siril, ir shows up as B&W (“one layer”), but for sure it is from a color camera… The windows photo app shows the colors, so the file is OK, only Siril does not know how to read it.
One question mark gives rise to two of them - a chain reaction is building up!
So your CR2 work??
Well if your RAW file is displayed in monochrome this is normal. You should read Siril documentation before trying to use it. Astrophotography is very specific. Some skills are needed.