[Lcms-user] Re: Saving to Lab Tiff

[<ma...@li...>]

Hi Armindo,

> but when writting R:=255, G=0 and B= 0 (Lab 100, 0 , 0) I don't have a pure
> white. (litlle bit blueish..)
>
> any idea?

Humm... The encoded result is FF 00 00? This should be
translated as white. Which software renders this blue? Photoshop?
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.

There is a updated input profile for tiff8 at
http://www.littlecms.com/tiff8adobe.zip

I wonder if this is the case.

Regards,
Marti.


----- Original Message -----
From: "ADS" <tec...@wa...>
To: "Martí Maria" <ma...@li...>
Cc: <lcm...@li...>
Sent: Monday, October 14, 2002 5:28 AM
Subject: Saving to Lab Tiff


> Marti,
>
> I would like to save a TIFF Lab.
> Up to now , I have done the folowing :
>
> POut[i].Red := L2Fix(Lab.L);
> POut[i].Green := round(Lab.a);
> POut[i].Blue := round(Lab.b);
>
> where
> function L2Fix(L: extended): byte;
> begin
>   try
>     result := round(L * 2.55);
>   except
>   end;
> end;
>
> but when writting R:=255, G=0 and B= 0 (Lab 100, 0 , 0) I don't have a pure
> white. (litlle bit blueish..)
>
> any idea?
>
> thanks
>
> Armindo
>
>
>
>
>