Oce ColorStream, Руководство пользователя

Страница: 220 / 524

#
Description Color rows
The RGB values corresponding to the PTOCA colors are dis-
played in sRGB (range from 0 to 1, where "0" equals no satura-
tion and "1" (= 255 with RGB) represents maximum satura-
tion). The print output should correspond to theOCA colors. sRGB color space
according to IEC
61965 standard
The RGB values for the OCA colors were converted to the
CieL*a*b* space and printed. Value scale:
■
L*: 0 (minimum brightness or black) to 100 (maximum
brightness or white)
■
a*: -127 (green area) to +128 (red area)
■
b*: -127 (yellow area) to +128 (blue area)
The printed colors should correspond to the sRGB colors or
the OCA colors.
CIE 1976 L*a*b*
space with the
CCIR XA/11 rec-
ommended D65
white point
Value scale:
■
X: 0 to 0.9505 (blue -> red)
■
Y: 0 to 1.0 (blue -> green)
■
Z: 0 to 1.089 (dark -> light)
The printouts should correspond to the outputs of sRGB or
CIE L*a*b* and the OCA colors.
CIE 1931 XYZ
space with the
CCIR XA/11 rec-
ommended D65
white point
A gray value range from white to black is printed. The gray
fields are made up of sRGB color values, where these values are
identical (R = G = B = composite gray). A color shift can be
easily recognized as the eye reacts to this in a sensitive manner.
Ideally, no hue (reddish, yellowish etc.) should be visible. Gray value range
with sRGB color
space according to
IEC 61965 stan-
dard
This corresponds to the fourth color row, in this case using the
color space CIE L*a*b* (whereby a*=b*=0 and only L varies
from 100 to 0). The result must be identical to the fourth row.
Ideally, no hue should be visible here either. Gray value range
with CIE 1976
L*a*b* space with
the CCIR XA/11
recommended D65
white point
Lower Area
Device color spaces are used in the lower area. Color management is not active. The colors
are similar, but not identical, to those in color rows 1 to 3.
Chapter 6 - Operating the Printing System 220
Test Print Job 'ColorProof.ipds_pdf' — Page 8