Again, sorry about that. It has been a difficult and confusing 2 weeks for me. Will give it another look.
Will update this post as I go. First, I will be using 20180922_FUJ8679.raf from How to process mixed conditions lightning & getting nice colors in Darktable again. Here are the stats from the TIFs.
raw dev export
a00 2020 working
a01 2020 sRGB-linear
a02 2020 sRGB-standard
a10 2020-negclip working
a11 2020-negclip sRGB-linear
a12 2020-negclip sRGB-standard
min max avg std
a00 -0.172453 1.19215 0.0632094 0.085194
a01 -0.301892 1.21147 0.0650508 0.089532
a02 -2.72704 1.0766 0.236226 0.175046
a10 0 1.19215 0.0632294 0.0851788
a11 -0.108966 1.21147 0.06507 0.0895166
a12 -0.984307 1.0766 0.236404 0.174759
Part of the confusion was that I was doing way too many operations at once in my testing, and advanced ones at that. I was also looking at too many aspects of the images at once and as a result might have conducted tests simultaneously rather than separately, mad scientist style. Lastly, my posts were kind of gibberish, mixing up PF and RT, etc., etc.
This time I severely limited what I was doing. I have done 2 sets below. I did not do any pixel filtering (hot pixels, in-painting), only clipped negative values to 0, applied 2.2 gamma to linear exports (working, sRGB-linear) and then stretched each set for display. It is done in the same order as the filenames listed above with a 0 prepended for the dark set and a 1 for the bright set. It is no surprise that 0a00 and 0a10, and 1a00 and 1a10, are the same images, respectively.
gmic input_glob *.tif z 0%,30%,25%,70% c 0,100% ^^[^^2,5] {1/2.2} psnr_ 0 repeat $! nm[$^>] 0{$^>,b} done / 0.3862 * 255 round out_ jpg
gmic input_glob *.tif z 25%,30%,50%,70% c 0,100% ^^[^^2,5] {1/2.2} psnr_ 0 repeat $! nm[$^>] 1{$^>,b} done / 1.05898 * 255 round out_ jpg
I decided to upload the results in a zip file instead of displaying them so that I don’t mess up the order and discourse doesn’t do anything to them. Let me know if you want anything done differently. (I know JPGs are lossy and G’MIC can alter the final ranges when saving to JPG. I chose JPGs because my upload speed is slow and I don’t want it to cut off halfway.)
0a00+.zip (28.2 MB)