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To: Jon Saxton <js@triton.vg>
cc: tiff <tiff@olympiakos.com>
Subject: Re: Photometric interpretation for grey-scale JPEG 
In-reply-to: <20020704160109.IRBN15606.out020.verizon.net@thalassa> 
References: <B937CE9D.BF6C%bruno_ledoux@binuscan.com> <20020703132702.GFFF27345.out018.verizon.net@thalassa> <303.1025759630@sss.pgh.pa.us> <20020704160109.IRBN15606.out020.verizon.net@thalassa>
Comments: In-reply-to Jon Saxton <spam.free@verizon.net>
	message dated "Thu, 04 Jul 2002 12:01:03 -0400"
Date: Thu, 04 Jul 2002 13:40:38 -0400
Message-ID: <4339.1025804438@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Jon Saxton <spam.free@verizon.net> writes:
> Now, I have a follow-on question.  How is it that
> PhotometricInterpretation has nothing to do with the colour space of
> the stored data?

How do you arrive at that conclusion?  PI is supposed to be exactly
the colourspace of the stored data.

>> PhotometricInterpretation and related fields shall
>> describe the color space actually stored in the file.

> What part of the last sentence don't I understand?

AFAICT you understand it perfectly; but whoever made those TIFF files
you are looking at did not understand it.

Actually, wait a minute.  Are those files PlanarConfiguration 2?
If so, it'd be legitimate (in fact necessary) for the individual
color planes to be represented as grayscale JPEGs, while PI will
denote the overall colorspace interpretation to be given to the
reassembled data.  But as long as PlanarConfiguration=1, PI should
match the stored colorspace in the JPEG images.

			regards, tom lane

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