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From: Toby Thain <toby@smartgames.ca>
Subject: Re: [Tiff] Tag 346
Date: Mon, 16 Oct 2006 18:18:33 -0400
To: Ross Presser <rpresser@gmail.com>
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Status:   


On 16-Oct-06, at 5:47 PM, Ross Presser wrote:

> Joris,
>
>> Ross Presser wrote:
>> > Is there any extant software anywhere that implements this,  
>> either for
>> > writing or reading? (I have some hints that Pagemaker supported  
>> it at
>> > some point.)
>> >
>> > Also, are there any sample images anywhere?
>>
>> To the best of my knowledge, that's a 'no' on both questions. I've  
>> never
>> seen any file come my way that uses the Indexed tag. ...
>
> Thanks for that information.  It certainly makes sense then; the tag
> was proposed without having been fully thought out, so it never got
> used.
>
> The reason I asked is slightly off topic for TIFF, in fact. As you
> probably know, the PDF spec does support Indexed images in any
> colorspace defined in the PDF. In fact, the default profile for Adobe
> Distiller will automatically convert *all* images in the source to
> indexed images as long as the total color count is less than 256. This
> can yield some terrific compression: the files in my workflow each
> contain a single 8636x9144 pixel bitmap that uses only three colors --
> black, white, and 100% magenta; the file sizes range from under a
> megabyte to about three megabytes. It's perfect for this application.

Did you try using LZW or ZIP compression on the 32-bit CMYK TIFF?

--Toby

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