Code: Select all
magick imput.jpg -colorspace rgb -filter Quadratic -distort SRT -0.22 -colorspace sRGB output.png
The second group that looks identical is sRGB, LAB, Luv, CIELab, CMYK, CMY, HCL, HCLp, HSB, HSI, HSV, HWB, LCHab, LCHuv, OHTA, Rec601YCbCr, Rec709YCbCr, TRansparent, YCbCr, YDbDr, YIQ, YPbPr and Yuv. Bloctches in the shadows are reduced but introduces blotches in the midtones.
The outliers are RGB Sigmoidal(5.5), Log and HSL:
After playing around with blending the different ouptuts, in an attempt to cancel out the blotches, I settled on an average of Sigmoidal and Log. Compare to the original on the right.