the thing is that I want accuracy and gamut checking :-)
hence I am doing both at the moment, the former to get the more prescise results, and the later for determing gamut clipping.
thanks
Louis Solomon www.steelbytes.com
----- Original Message ----- From: "Marti Maria" <[EMAIL PROTECTED]>
To: "Louis Solomon [SteelBytes]" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, 27 August 2004 7:16 PM
Subject: Re: [Lcms-user] accuracy ...
Hi,
Hi, which of the following should give more accurate results (I don't care about speed) ?
They are not same. First one, using cmsCreateTransform() is doing a
transformation from XYZ to an RGB profile. The second is emulating which
would be the appearance of first, when viewed under a device characterized
by the same profile as the destination. Inside gamut all should be same, but
on gamut boundaries some values may change. Hence, you got slightly
different values in same zones. With this one you can control which values
are out of gamut, thought.
I guess you just want the first one, which is the most accurate.. For controlling accuracy vs. speed there are some flags. You have already choosen cmsFLAGS_NOTPRECALC which turns to be the most accurate ands slow.
Regards, Marti Maria The little cms project http://www.littlecms.com
----- Original Message ----- From: "Louis Solomon [SteelBytes]" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, August 27, 2004 7:23 AM
Subject: [Lcms-user] accuracy ...
Hi, which of the following should give more accurate results (I don't care about speed) ? I am guessing cmsCreateTransform(), and yes I do get different results for some input XYZs, altough not very different.
cmsHTRANSFORM trans_XYZ_to_customRGB = cmsCreateTransform( profile_XYZ,TYPE_XYZ_DBL, profile_customRGB,TYPE_RGB_DBL, INTENT_ABSOLUTE_COLORIMETRIC, cmsFLAGS_NOTPRECALC);
cmsHTRANSFORM trans_XYZ_to_customRGB_withgamutcheck = cmsCreateProofingTransform( profile_XYZ,TYPE_XYZ_DBL, profile_customRGB,TYPE_RGB_DBL, profile_customRGB, INTENT_ABSOLUTE_COLORIMETRIC,INTENT_ABSOLUTE_COLORIMETRIC, cmsFLAGS_NOTPRECALC|cmsFLAGS_SOFTPROOFING|cmsFLAGS_GAMUTCHECK);
Louis Solomon www.steelbytes.com
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