Oce VarioPrint i Series User Manual

•
a* - the red - green component, where +a* indicates red, and -a* indicates green, ranges
from -128 to +127.
•
b* - the yellow - blue component, where +b* indicates yellow, and -b* indicates blue, ranges
from -128 to +127.
•
The CIE L*C*h* uses L*, C*, and h* components where the C* and h* components are
calculated from the a* and b* coordinates of the CIE L*a*b* model.
A color has the same location in CIE L*C*h* and CIE L*a*b*, but uses different notations.
L
C
h
[313] CIE L*C*h*
The L*C*h* color space uses the following components:
•
L* - the lightness component ranges from 0 to 100. The L* component is the same as in
L*a*b*.
•
C* - the chroma component, the distance from the lightness axis, ranges from 0 at the axes
to more than 100 at the edge.
•
h* - the hue angle, expressed in degrees, where 0° means the location on the +a* axis and
180° means the location on the +a* axis.
△E (Delta E)
The most general metric to express the difference between two colors in CIELAB is Delta E. The
Delta E value predicts how the human eye perceives the color difference.
Delta E does not always give enough information about differences between colors. Therefore,
most color evaluations also use other metrics. The interpretation of a Delta E value remains
subjective. The impact of a certain Delta E value depends on the application and even on the
color. For example, the human eye can better distinguish a difference between grayish colors
than between highly saturated colors.
Learn about color differences
Chapter 9 - Print what you expect
251

Oce VarioPrint i Series Specifications

General

Brand	Oce
Model	VarioPrint i Series
Category	Printer
Language	English