[argyllcms] Re: sRGB variants

  • From: Elle Stone <l.elle.stone@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Fri, 22 Jun 2012 14:15:13 -0400

On 6/22/12, Kamil Tresnak <kamil.tresnak@xxxxxxxxx> wrote:
> I also noticed that there are many different sRGB files, but I relied on
> the belief that they conform to the standard.

Me, too. I just assumed that all software offering to embed "the" sRGB
profile would embed the same profile. Wrong!

On 6/22/12, Iliah Borg <ib@xxxxxxxxxxx> wrote:
> Incidentally, I did a similar experiment with sRGB that comes with Adobe
> Photoshop.
>xicclu -s255 -pl /Library/Application\ 
>Support/Adobe/Color/Profiles/Recommended/sRGB\ Color\ Space\ >Profile.icm < 
>sRGB_ND.txt
>
>255.000000 255.000000 255.000000 [RGB] -> MatrixFwd -> 99.998820 0.018274 
>-0.016832 [Lab]
>242.000000 242.000000 242.000000 [RGB] -> MatrixFwd -> 95.492526 0.017564 
>-0.016178 [Lab]
>201.000000 201.000000 201.000000 [RGB] -> MatrixFwd -> 80.964090 0.015275 
>-0.014070 [Lab]
>161.000000 161.000000 161.000000 [RGB] -> MatrixFwd -> 66.242930 0.012956 
>-0.011934 [Lab]
>122.000000 122.000000 122.000000 [RGB] -> MatrixFwd -> 51.222637 0.010590 
>-0.009754 [Lab]
>83.000000 83.000000 83.000000 [RGB] -> MatrixFwd -> 35.302177 0.008082 
>-0.007444 [Lab]
>49.000000 49.000000 49.000000 [RGB] -> MatrixFwd -> 20.327904 0.005723 
>-0.005271 [Lab]
>0.000000 0.000000 0.000000 [RGB] -> MatrixFwd -> 0.000000 0.000000 0.000000 
>[Lab]

Iliah, thanks! for the xicclu values. I was wondering about Adobe
Photoshop. It looks like the Adobe sRGB xicclu Lab values are an order
of magnitude less neutral than the other sRGB variants floating around
(other than the non-Bradford-adapted mystery profile).

-- 
Elle Stone
http://ninedegreesbelow.com

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