Hi Casper,
There is a function that does exactly what you want:
cmsHPROFILE cmsCreateLinearizationDeviceLink(icColorSpaceSignature ColorSpace,
LPGAMMATABLE
TransferFunctions[])
You have to allocate 3 gamma tables. They should have same number of entries.
LPGAMMATABLE TransferFunctions[3];
TransferFunction[0] = cmsBuildGamma(256, 1.0);
TransferFunction[1] = cmsBuildGamma(256, 1.0);
TransferFunction[2] = cmsBuildGamma(256, 1.0);
I'm using cmsBuildGamma() because it initializes the contents of the table. You
could
use cmsAllocGamma() but this returns garbage inside tables, as you are supposed
to
fill the required values.
After that, you can modify the L* curve. It would be the first one in Lab
space:
TransferFunctions[0]. Just make sure you normalize values in range 0..0xFFFF,
so first entry should be zero and last entry 0xFFFF. This assures black is
mapped
on black and white on white.
Then pass those curves to the function, marking the profile as operating in Lab
space.
hProfile = cmsCreateLinearizationDeviceLink(icSigLabData, TransferFunctions);
Voilà, all done. The profile is not marked as "abstract" but as "devicelink".
If you want
this detail covered, you can mark the profile as abstract by using
cmsSetDeviceClass(hProfile, icSigAbstractClass);
Anyway, that latter is not required at all.
Regards,
--
Marti Maria
The littlecms project.
www.littlecms.com
----- Original Message -----
From: "Casper Boemann" <[EMAIL PROTECTED]>
To: <lcms-user@lists.sourceforge.net>
Sent: Friday, July 29, 2005 11:07 AM
Subject: [Lcms-user] writing an advanced brightness/contrast abstract profile
Hi
I have now made a widget that lets the user specify a spline curve for
transforming lightness. like an advanced brightness/contrast dialog.
Now I wonder how I can make an abstract profile just like the one created
by cmsCreateBCHSWabstractProfile, but taking my spline curve as input.
I was looking at the cmsAllocGamma with a lot of entries in the table, but I
don't know if this is the right way to go?
best regards / venlig hilsen
Casper Boemann
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