I've been imaging actively for about 2 years now but have never learned to do flats until recently. I use SharpCap 3.2 to do my stacking. My light frames are png files shot with the gain set to 350. A video I watched on YouTube said to shoot the flats as fits files and reduce any gain setting to zero (so I did) but when I put the lights and the flats into SharpCap, SharpCap could not process the two together due to incompatibility issues. Do I need to shoot the flats in the same format that my light frames are and with the same gain?
Also, when doing LGRB do I need to shoot flats for L and also each color? I can't find any info to guide me on this. Any help on these issues would be greatly appreciated!