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From: fpa@qualcomm.com (Franklin Antonio)
Newsgroups: comp.graphics
Subject: CIE (1931) XYZ vs xyY
Keywords: CIE color Macbeth
Message-ID: <1990Oct4.025925.22471@qualcomm.com>
Date: 4 Oct 90 02:59:25 GMT
Organization: Qualcomm Inc., San Diego, CA
Lines: 10

Recently purcased the book "Illumination and Color in Computer Generated
Imagery" by Roy Hall.  Great book.  In this book, he gives the color
coordinates of each square of the Macbeth ColorChecker(r) chart using
CIE 1931 XYZ coordinates.  I ran out & bought one of these charts at
my local camera store, and started writing a program to calibrate my
computer's display.  The chart came with a leaflet which lists the
color coordinates of each square on the chart, but it contains different
numbers!  It also claims to be using the CIE 1931 system, but the three
columns are labelled " x y Y " instead of " X Y Z ".  Anybody know what's
going on here?