On 10/10/2014 01:41 PM, Øyvind Kolås wrote:
On Fri, Oct 10, 2014 at 6:36 PM, Elle Stone
<ellest...@ninedegreesbelow.com> wrote:
> On 10/09/2014 07:52 PM, Michael Henning wrote:
>>On Thu, Oct 9, 2014 at 7:22 PM, Elle Stone
>So where in the conversion to XYZ and then to LAB (or any other reference
>color space) will "sRGB as PCS" fit in?
This conversion would be User_RGB -> "sRGB PCS" -> LAB.
You cannot get from User_RGB to "sRGB as PCS" without going through XYZ.
XYZ is the PCS ("Profile Connection Space") for converting between RGB
color spaces. sRGB is not a Profile Connection Space.
You cannot get from "sRGB as PCS" to LAB without first converting from
"sRGB as PCS" to XYZ. LAB is a mathematical transform of XYZ, not sRGB.
This is the normal path from User_RGB to LAB: User_RGB -> XYZ -> LAB.
Two conversions.
You want to take this path, yes? User_RGB -> XYZ -> "sRGB as PCS" -> XYZ
-> LAB. Four conversions, going through XYZ twice.
Why is the second path preferable?
With respect,
Elle Stone
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