[scikit-image] color.lab2rgb output differs from colormine.org

[Michael O'Brien]

I'm not sure what illuminant colormine uses but if you multiple by 255 you
get 151,154,141 which it getting closer to what I expect (greenish colour)
with 105,119,70 still being much closer

On Mon, 27 Mar 2017, 14:22 Ryan Anderson, <randerson at resonon.com> wrote:

> It looks to me as if lab2rgb is returning colors scaled as floats between
> 0 and 1 while colormine.org is returning 8 bit integers scaled 0-255.
>
> Try multiplying by 255 and comparing the outputs.
>
> On Mar 27, 2017 7:02 AM, "Michael O'Brien" <mob.irl at gmail.com> wrote:
>
> Hi all,
>
>
> If I use the following array of LAB values
> array([[[ 48.07851346, -14.69400135, 25.2170507 ],
>  [ 63.21232753, -3.65444198, 6.67734193],
>  [ 45.80027308, -2.47952304, 11.5073341 ],
>  [ 46.84900559, -10.37025167, 19.92527996],
>  [ 44.92476952, 19.36861848, 2.97238555],
>  [ 35.50132805, 5.89086564, 1.95259827]]])
> and use the following code to pass the array to lab2rgb
> rgbcolours =color.lab2rgb(ClusterColours.values[np.newaxis])
> I get the array
> array([[[ 0.40929448, 0.47071505, 0.27701891],
>  [ 0.59383913, 0.60611158, 0.55329837],
>  [ 0.4393785 , 0.4276561 , 0.34999225],
>  [ 0.4159481 , 0.4516056 , 0.3026519 ],
>  [ 0.54449997, 0.36963636, 0.4001209 ],
>  [ 0.36970012, 0.3145826 , 0.315974 ]]])
> but on colormine.org if I enter the 1st of the LAB values I get 105,119,70 for RGB and not colours so close to black
>
> Where am I going wrong?
>
>
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