Re: [Lcms-user] sRGB to Lab change of behaviour in 2.4

[Marti M. <mar...@li...>]

Hi,
Older versions were incorrectly messing out the encoding.

Now you got the right CIE L*a*b* value, which is (27.5, 0, 0)
for V4 perceptual and (26.6, 0, 0) for relative colorimetric.
Check any other conversion tool, Bruce Lindbloom's
for example http://www.brucelindbloom.com/

Regards
Marti



El 28/09/2012 13:36, Lukas Jirkovsky escribió:
> Hello,
> did the behaviour of conversion from sRGB to Lab changed in the lcms 2.4?
>
> After update to 2.4 I get different results from what I used to get
> with older lcms versions. The values used to be somewhere in range
> [0,1], but now the values seems to be in range [0-100?].
>
> For example, assume the conversion conversion from uint8 sRGB:
> {63, 63, 63}
> to Lab float.
>
> With older lcms versions I got:
> {0.275746, 0.502007, 0.501945}
> but now I get:
> {27.5745792, 0.0116731515, -0.00389105058}
>
> Is this change intentional?
>
> The profiles are created using the cmsCreate_sRGBProfile() function
> for RGB and cmsCreateLab4Profile(0) for Lab.
>
> Regards,
> Lukas
>
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