Re: X-Rite Passport Inaccuracies
Re: X-Rite Passport Inaccuracies
- Subject: Re: X-Rite Passport Inaccuracies
- From: Andrew Rodney <email@hidden>
- Date: Sun, 22 Sep 2013 14:41:10 -0600
On Sep 22, 2013, at 12:19 PM, Eric Chan <email@hidden> wrote:
> Andrew, there is no rendering intent involved in the L*a*b* color readouts. The image pixel values are simply converted from (Linear) ProPhoto RGB to L*a*b* using standard CIE conversion routines.
Sorry, I was in error about RGB to Lab values, I am referring to CMYK to Lab. And sorry if this is OT.
If I convert ProPhoto RGB to SWOP V2, Photoshop reports the Lab values as 0/0/1, LR reports them as 0.3/0.3/0.0. ColorThink reports them as 13.5/-0.07/0.93. I asked Chris Cox about this, he told me the CMYK to Lab conversions were using RelCol, I believe ColorThink reports them as Abs Colorimetric. Just wondering why.
Andrew
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