More on LCH and JCH

Processing
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Argh! Sorry, I messed up! I forgot that

gmic h rgb2lab

    rgb2lab (+):
                        illuminant={ 0=D50 | 1=D65 } |
                        (no arg)

gmic 50,50,1,3 fill_color 0,0,255 rgb2lab 0 lab2lch s c k.. p

whereas

rgb2lch --> rgb2lab 1 lab2lch

∴ 0,0,255 → 133.80 131.208, or if you keep more figures, 131.20828247070312.

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