Hi,
> I don't know if this is a proper question here but I want apply
> scanner profile to ProphotoRGB space but don't want Gamma LUT.
> I need LOG intensity output or LOG-Gamma. Is there any
> possibilities to build it in this LUTs?
If you are building your own profiles, definitively yes. You are free to choose
whatever kind of curve you want to include. The only restriction is curve must
be monotonic (and this condition is sometimes relaxed).
In the other hand, if you are using an existing profile, it can also be done but is
harder... lcms handles profiles mostly as black boxes. In this case you should
create a abstract profile and use a multiprofile transform.
But anyway, assuming you are building your own profile, you can use the
prelinearization table. Since this is a table of sampled values, you can
allocate an empty table, and fill it by your own:
table = cmsAllocateGamma(256)
for (i=0; i < 256; i++)
table -> GammaTable[i] = log(...)
Keep in mind values are normalized to 0..0xffff range
Regards,
Martí Maria
The little cms project
http://www.littlecms.com
[EMAIL PROTECTED]
----- Original Message -----
From: "Jacek Zagaja" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, September 29, 2002 5:51 AM
Subject: [Lcms-user] Different Tone Mapping Functions into ICC
> Hello lcms-user,
>
> I don't know if this is a proper question here but I want apply
> scanner profile to ProphotoRGB space but don't want Gamma LUT.
> I need LOG intensity output or LOG-Gamma. Is there any
> possibilities to build it in this LUTs?
>
> Regards,
>
>
> --
> Jacek Zagaja,
> "Good composition is the best [EMAIL PROTECTED]
> way of seeing"
>
>
>
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