CIE 1976 color space is approximate

CIE 1976 color space is approximately uniform for theperception of small color differences. That is, for specimenscompared to a standard, color differences (distances) in anydirection are of about the same importance (weight). Thus; CIEL*a*b* color difference (ΔE*) is an equally weightedcombination of the coordinate (L*, a*, b*) differences.Industrial color acceptability decisions are often not basedsolely on the equally weighted CIE color difference (ΔE*)function. By establishing tolerances that may differ for differentcolors, and also may differ for each coordinate, an effectivecolor acceptability management system is possible using CIEL*a*b*.A drawback to using CIE L*a*b* in tolerancing systems is thatthe rectangular acceptability volumes do not conform well withvisual experience. A visual acceptability volume (in CIE 1976space) typically takes the form of an ellipsoid, whose minoraxis aligns in the direction of changing hue. Since both theshape and alignment of the L*a*b* volume do not agree wellwith visual experience, colors near the edges of the volumemay be calculated as acceptable although visually judgedunacceptable

CIE 1976 color space is approximately uniform for the
perception of small color differences. That, is for specimens
compared. To, a standard color differences (distances) in any
direction are of about the same importance (weight). Thus; CIE
* * L a b *. Color difference (Δ E *) is an equally weighted
combination of the coordinate (L *, *, *) a B differences.
.Industrial color acceptability decisions are often not based
solely on the equally weighted CIE color difference (Δ E *)
function.? By establishing tolerances that may differ for different
colors and also, may differ for, each coordinate an effective
color. Acceptability management system is possible using CIE
L * * * a B.
A drawback to using CIE L * * * a B in tolerancing systems is that
.The rectangular acceptability volumes do not conform well with
visual experience. A visual acceptability volume (in CIE. 1976
space) typically takes the form of, an ellipsoid whose minor
axis aligns in the direction of changing hue. Since both. The
shape and alignment of the L * * * a B volume do not agree well
with visual experience colors near, the edges of the volume
.May be calculated as acceptable although visually judged
unacceptable.