I took a number of flats with my ASIAIR Pro and ASI533MC but the only program that gives me a realistic view of the files is the ZWO ASIFitsView. Anything else I open it with ends up with a gray image. Is there something missing in the header?
JohnD
I installed ASTAP and it picks it up properly. The other ones I tried (GIMP, Affinity Photo, and FITS Liberator) did not give me a proper view. FITS Liberator does not pick up the Bayer Pattern properly.