Path: utzoo!attcan!uunet!van-bc!tessera!jtc
From: jtc@tessera.uucp (J.T. Conklin)
Newsgroups: comp.graphics
Subject: Re: Image file format discussion
Message-ID: <1989Oct22.035238.1047@tessera.uucp>
Date: 22 Oct 89 03:52:38 GMT
References: <1198@clinet.FI> <390039@hpfcdq.HP.COM> <4608@mentor.cc.purdue.edu> <6040@pitt.UUCP>
Reply-To: jtc@tessera.UUCP (J.T. Conklin)
Organization: Tesseract Communications, Burnaby, B.C., Canada
Lines: 24

In article <6040@pitt.UUCP> planting@cs.pitt.edu writes:
>There is other information that should be stored with images but which
>I have not heard anyone mention.

You are in luck.  Image colorimetry information was added to the TIFF
standard as of TIFF 5.0 (8/8/88).

>_Big-endian vs. Little-endian_:
    Set by GreyResponseCurve for bilevel and greyscale, and ColorMap
    for palette color images.  RGB is defined such that 0 represents
    minimum intensity.

>_Primary colors_:
    Set by TIFF's PrimaryChromaticities tag

>_Gamma correction factor_:
    Set by TIFF's ColorResponseCurves tag

    --jtc


-- 
J.T. Conklin
	...!{ubc-cs,uunet}!van-bc!tessera!jtc