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List:       kde-kimageshop
Subject:    Re: What coefficients does Krita use for YUV/YCbCr?
From:       Cyrille Berger <cberger () cberger ! net>
Date:       2007-05-23 20:57:19
Message-ID: 200705232257.20079.cberger () cberger ! net
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Hi

On Wednesday 23 May 2007, Matthew Woehlke wrote:
> I don't know if anyone follows k-c-d, but I'm working on a color
> blending function for kdelibs that will support HSY color space (like
> HSL but with luma as in YUV/YCbCr color spaces). Alas, there are two
> common sets of coefficients used to calculate Y:
>
> 601: Y' = 0.299  R' + 0.587  G' + 0.114  B'
> 709: Y' = 0.2126 R' + 0.7152 G' + 0.0722 B'
>
> I figure this is probably the best place to ask; which would be better
> to use in kdelibs (or should I offer /both/)? Which does Krita use?

Krita 1.6 is hard coded to use 601. While for 2.0 the plan is to allow use any 
coefficients, even non common :)

601 coefficients are the default for TIFF. I guess that for your use any of 
the coeffcients are good enought anyway.

-- 
Cyrille Berger
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