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ImPPG v. 1.9.1-beta is out with the following bug fixes:

• Invalid channel order when loading 8-bit RGB images
• Cannot enable adaptive unsharp mask
• Crash when using adaptive unsharp mask in CPU & bitmaps mode

Homepage: https://greatattractor.github.io/imppg/
Download: https://github.com/GreatAttractor/imppg ... 1.9.1-beta

Thanks Filip,

I tried to use it but I can't open it, I get this error, any ideas?
Kind regards
Alexandra

I've just downloaded it and it ran fine, libcfitsio-3.dll is present in imppg-win64.zip. Can you try downloading again, unpacking to a fresh directory and running from there?

On another note: did you copy "imppg.exe" somewhere else (and renamed it "imppg 1.9.exe"?) It has to stay in the same folder as all the other files (DLLs, images etc.). However, it's fine to make a shortcut (link) to imppg.exe (e.g., on the Desktop).