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> From what I understand of the TIFF 6.0 spec (pg. 28-29),
> a TIFF implementation should be able to cope with
> different bit depths for every channel.

The spec allows such images to be represented, but it does not
require TIFF readers to handle them.  (Note that all flavors of
baseline TIFF have equal bitspersample for each channel.)
This is one of many optional features of TIFF.

> After looking
> at the sources, I think that libtiff doesn't allow this.

Correct, libtiff is not designed to support this.  AFAIK,
Sam has no plans to improve libtiff in that particular direction.
Such images are very few and far between.

			regards, tom lane


AWARE [SYSTEMS]		Imaging expertise for the Delphi developer
		TIFF and LibTiff Mailing List Archive
	LibTiff Mailing List TIFF and LibTiff Mailing List Archive January 1997 Previous Thread Next Thread Previous by Thread Next by Thread Previous by Date Next by Date Contact The TIFF Mailing List Homepage This list is run by Frank Warmerdam Archive maintained by AWare Systems	Thread 1997.01.09 12:28 "BITSPERSAMPLE question", by Sven Devriese 1997.01.09 16:23 "Re: BITSPERSAMPLE question", by Tom Lane 1997.01.09 16:23 "Re: BITSPERSAMPLE question", by Tom Lane > From what I understand of the TIFF 6.0 spec (pg. 28-29), > a TIFF implementation should be able to cope with > different bit depths for every channel. The spec allows such images to be represented, but it does not require TIFF readers to handle them. (Note that all flavors of baseline TIFF have equal bitspersample for each channel.) This is one of many optional features of TIFF. > After looking > at the sources, I think that libtiff doesn't allow this. Correct, libtiff is not designed to support this. AFAIK, Sam has no plans to improve libtiff in that particular direction. Such images are very few and far between. regards, tom lane

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1997.01.09 16:23 "Re: BITSPERSAMPLE question", by Tom Lane