[argyllcms] Re: Measuring and converting colors to sRGB
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 13 Feb 2012 10:05:11 +1100
Pascal de Bruijn wrote:
> XYZ = 1.231303 1.000000 0.023474, x,y = 0.546086 0.443503
> D50 L*a*b* = 100.000000 42.461990 138.939711
This is a rather saturated color (139)
> But when I put the XYZ values through xicclu, I get a huge mount of
> clipping, which resultings in a hue shift to the yellow:
>
> $ xicclu -f b -s 255 srgb.icc
> 1.231303 1.000000 0.023474
> 1.231303 1.000000 0.023474 [XYZ] -> MatrixBwd -> 255.000000 219.479747
> 0.000000 [RGB] (clip)
>
> So the big question is, did I use the wrong mode for measuring the
> terminal? Or am I just misusing xicclu?
It's out of gamut of sRGB. This is not much of a surprise really, since the
any highly saturated phosphor color is likely to be similar in saturation
to the RGB primaries, and if it is centred on a different wavelength
it will be expected to fall outside the RGB triangle since the spectrum
locus is a curve in xy space.
I guess the only surprise is that they chose a highly saturated phosphor -
I would have thought they could have mixed a range of phosphors in to
de-saturate it.
Graeme Gill.
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