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I recently purchased a Sony A7iii Camera and am having difficulty understanding what the appropriate software package would be to do simply photo editing. (I'm an amateur photographer with experience going back to the days of the Canon Ftb 35mm camera. My photography has tended to be of the 'on-again/off-again' style. My digital camera experience began with the Canon D30, then a 5D and finally, about 2 1/2 years ago, I bought a Canon 6D but haven't used it much. What got me interested in mirrorless cameras was the possiblity of using my old Canon 'FD' lenses again ... I like the way they look-and-feel and their heft ... I'm not a fan of 'plastic lenses'. Manually focusing and setting exposure doesn't bother me.) Some of the first pictures I took with my A7iii were out on my driveway about 10:30 at night looking up at the stars (what can be seen through big city sky-brightness). What software will let me take a night time picture of the sky and then follow up with a 'dark frame' ... then use software to subtract the dark frame from the sky photo to reduce camera generated noise ? I don't intend to spend hundreds-of-Dollars on professional software and am hoping that there's something inexpensive that will do what I want. (I've downloaded-and-installed 'ImageJ' software but have not learned how to use it yet.) Suggestions ? - Paul