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Date: Thu, 11 Nov 93 11:41:41 PST
From: rjd@mda.ca (Robert Doerksen)
Message-Id: <9311111941.AA02605@ mda.ca>
To: tiff@sgi.sgi.com
Subject: Re: grayscale format
Cc: rjd@mda.ca, jin@george.lbl.gov
Sender: tiff-owner@sgi.sgi.com

Good Question Jin,
Have you heard a response from anybody official yet?  My reading of the TIFF
spec leads me to believe that Baseline TIFF readers must support 4-bit and 
8-bit grayscale imagery, but I am assuming that TIFF readers which support 
some of the extensions would also support the other types you have mentioned.
The one type which I have not read anything about is the type "complex".  I am
communicating with ALDUS to determine whether we can store a complex image as:
	SamplesPerPixel = 2	(ie: REAL, IMAG)
	BitsPerSample = 16, 16
	SampleType = unsigned integer
	PhotometricInterpretation = "new unique value indicating complex
			cartesian data"
For our application, we would like the TIFF reader to read the two components
of each pixel, and then calculate and display the magnitude as an 8-bit 
gray-scale (the least-sig 8 bits would be truncated for display purposes).

Please let me know if you hear anything.  Thanks,
Rob Doerksen



> From tiff-owner@whizzer.wpd.sgi.com Tue Nov  9 16:25:38 1993
> Date: Tue, 9 Nov 93 15:26:24 PST
> From: jin@george.lbl.gov (Guojun Jin[ITG])
> To: tiff@sgi.com
> Subject: grayscale format
> Sender: tiff-owner@sgi.com
> Content-Length: 573
> 
> >From looking at TIFF 6.0 spec., seems TIFF is not supporting short, long, float,
> double and complex gray-scale image formats.  I hope I am wrong. Could someone
> tell me from where I can find related information?
> 
> Thanks for giving any information!
> 
> /---------------------------------------v-------------------------------\
> |	Jin Guojun, Imaging Technology	| Internet: g_jin@lbl.gov	|
> |	Lawrence Berkeley Laboratory	| Usenet: ucbvax!g_jin@lbl.gov	|
> |			| Bitnet:	jin%george.lbl.gov@Csa3.LBL.Gov	|
> \---------------------------------------^-------------------------------/
> 
> 
> 
> 



