The mtf command could be useful to you, it’s the equivalent of histogram stretching. It can be done on a sequence too. But it does not guarantee that all your images will have the same signal at the end, only that you apply the same stretching to all of them.
When I write this:
load pp_light_00001.fit
mtf 0.0 0.01 0.5
My stars gets visible on grey background, even in Linear mode. What exactly happened here? What are the values and what range should they have to produce nice background with stars?
I think it’s the same values as in the histogram tool, so probably values of 0.07 0.15 and 1.0 are close to what fits in general, but it depends on images. The third value should always stay at 1.
I’ll have to make a few tries with load and linear match to answer the other question, unless @lock042 already has the answer?