> I use the standard Lcms Lab profile. (cmsCreateLabProfile(nil);)
> Shouldn't I?

It happens that the ICC encoding and the TIFF encoding are sligtly
different:

For decoding TIFF:
--------------------
L: divide L by 2.55
a, b: substract 256 if greater that 127


For decoding ICC:
-------------------
L: divide L by 2.55
a, b: substract 128

The http://www.littlecms.com/tiff8adobe.zip profile
is doing the translation. Otherwise it doesn't touch any color.

Regards,
Mart�.


----- Original Message -----
From: "ADS" <[EMAIL PROTECTED]>
To: "Mart� Maria" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Monday, October 14, 2002 7:41 AM
Subject: [Lcms-user] Saving to Lab Tiff


> idea?
> >
> > Humm... The encoded result is FF 00 00? This should be
> > translated as white. Which software renders this blue? Photoshop?
> yes
>
>
> > Perhaps you are using the tifflab8.icm profile?. Adobe did publish
> > a TTN that states D50 as default white point, so the old tifflab8.icm
> > which was D65-based is now deprecated.
>
> I use the standard Lcms Lab profile. (cmsCreateLabProfile(nil);)
> Shouldn't I?
>
>
> thanks
>
> Armindo
>
>
>
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