Description
#
DescriptionItem
All color stations are addressed via the 'Color index'. You can
adjust the 'Color index' on the operator panel in the 'PCL
simple color' menu.
The printed gauges can be used to read out the raster angle and
raster width for every print station. A moiré circle is created for
every print station. The radial line in the center of the moiré
indicates the width of the raster in Ipi. The angle axis in the
center of the moiré indicates the raster angle.
Note:
The moiré circles display all raster angles correctly when
printing in bilevel mode. If GraphicArts (multilevel/dot
matrix) is used, then the raster angle will also be correct-
ly displayed for black. Line halftones are used for cyan,
magenta and yellow. Therefore, in this case, 90° must
be added in a clockwise direction to each displayed an-
gle.
Raster Angle and
Raster Width
The tone transfer curve is activated via Highlight Color and
tested. In calibrated printers, the tone transfer curve is optically
equidistant. The first pixels should be visible from 3% onwards.
The optical density of the fields should then increase constantly.
At 97%, a few white spots in the raster can still be recognized
using a magnifying glass.
Highlight Color
tone transfer curve
The default RGB color palette is printed in the lower area. The
palette only contains eight colors. From Pen #8, the colors are
repeated cyclically, except for Pen #0.
HPGL/2 default
palette
Chapter 6 - Operating the Printing System 235
Test Print Job 'ColorProof.pcl' — Page 11
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