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From: Toby Thain <toby@smartgames.ca>
Subject: Re: [Tiff] Tag 346
Date: Tue, 17 Oct 2006 08:24:54 -0400
To: Leonard Rosenthol <leonardr@pdfsages.com>
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Status:   

>
>
>> But since there are apparently *zero* raster file formats that can
>> contain indexed CMYK images,
>
> 	Photoshop supports indexed CMYK, IIRC.

I'd be surprised.

>
>
>> it's impractical to do any image manipulation on these bitmaps.
>
> 	Not at all...You just need an imaging library that supports  
> indexed CMYK and can read a "blob"...GraphicMagick, for example,  
> springs to mind.   You could also use Adobe's new open-source GIL.  
> Or you could write your own.
>
>
>> I am considering writing a custom tool that converts them to RGB
>> palette on the fly, and back again.
>
> 	4->3->4 color conversion is a BAD IDEA!!   As the numbers  
> demonstrate, you will LOSE information (even with ICC-based color  
> conversion).

Doesn't matter for the OP's purpose (as he explained).

--Toby

>
>
> Leonard
> -- 
> ---------------------------------------------------------------------- 
> -----
> Leonard Rosenthol                             
> <mailto:leonardr@pdfsages.com>
> Chief Technical Officer                      <http://www.pdfsages.com>
> PDF Sages, Inc.                              215-938-7080 (voice)
>                                              215-689-3863 (fax)
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