I am composting an RGB image from the three base R, G and B saved files. On the screen everything looks good, but then my colors are off when the fits file is saved.
I used drizzle so each R etc. file is 12448 x 8336, pretty big. I never had this problem w/o drizzle, smaller files ?
Tried adjust layer brightness but that did nothing.
Hi,
Since green channel is the darker channel, I’d start doing an offset of the other two channels towards the left to match the three channels. This is an easy action for instance substracting in Pixelmath the mean or the median of the green channel to the others; then rescale with the minimum and the maximum values of the channels. This is a linear transformation that will not produce any problem for future immage processing. Afterwords, do the steps by step of the tutorial indicated by @vinvin.