Re: [Lcms-user] Lab to RGB not yielding expected values

2007-12-14 Thread Marti Maria
inal Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael A. Litscher Sent: Friday, December 14, 2007 10:22 AM To: Little CMS Mailing List Subject: Re: [Lcms-user] Lab to RGB not yielding expected values Marti, Thank you for replying. I did attempt to apply a sca

Re: [Lcms-user] Lab to RGB not yielding expected values

2007-12-14 Thread Michael A. Litscher
Marti, Thank you for replying. I did attempt to apply a scaling factor to the L* value as I was feeding the L*a*b* values into lcms for conversion to RGB after reading the replies of Kai-Uwe and yourself. I found that no matter what scaling factor I used, all it changed was which swatches had the

Re: [Lcms-user] Lab to RGB not yielding expected values

2007-12-12 Thread marti . maria
Hi, Kai-Uwe is right, ICC absolute intent does not account for intensity, that would be the CIE-absolute. There is a tag for obtaining such values, but lcms does not support that (nor any other CMM I'm aware of) Regards Marti Quoting Kai-Uwe Behrmann <[EMAIL PROTECTED]>: > Am 08.12.07, 18:36

Re: [Lcms-user] Lab to RGB not yielding expected values

2007-12-11 Thread Michael A. Litscher
I am not doing any scaling at all. I am leaving all of the math up to Little CMS, which is my purpose for using it. I know from experience that a 1.5 delta E is subtle. The difference in RGB values (displayed RGB versus lcms RGB calculated from measured Lab) that I am seeing are 6+ delta E off, wh

Re: [Lcms-user] Lab to RGB not yielding expected values

2007-12-10 Thread Kai-Uwe Behrmann
Am 08.12.07, 18:36 -0600 schrieb Michael A. Litscher: > The short version: > > The issue I am having is that if I display an RGB value on the screen > and measure it's Lab value, I should be able to feed that Lab value into > LCMS, along with the monitor's profile, and get the original RGB value,