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October 2006
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2006.10.16 22:18 "Re: Tag 346", by Toby Thain
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