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Chapter 3 Printing
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Screening
Specify the halftone processing method.
Halftone is a processing method that varies the
density and size of ink dots printed on paper to
give the appearance of continuous color gradation
when only using a limited number of inks.
[Error Diffusion]
This function expresses gradation by changing the
density of dots. The higher the density, the darker
the gradation. The lower the density, the lighter the
gradation.
[Dot Process (140 lpi)], [Dot Process (200 lpi)]
(When [Color Mode] is set to [Black])
[Dot Process (70 lpi)], [Dot Process (100 lpi)]
(When [Color Mode] is set to other than [Black])
This function expresses gradation by changing the
size of the dots. The larger the dots, the darker the
gradation. The smaller the dots, the lighter the
gradation.
A dot process of 100 lines per inch provides more
detailed images than of 70 lines per inch.
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Gamma Correction
Use this function to adjust the lightness, chroma,
contrast, and gamma value of red, green, and
blue.
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•
[Gamma Correction] and [Blank Page
Detection] cannot be used together. (p.126
"Blank Page Detection")
122
Select the [Gamma Correction] check box and click
[Details] to display the [Gamma Correction] dialog
box. Enter a value between -25 and +25 for each
item.
[Lightness]
The smaller the value, the darker (blackish) the
color. The larger the value, the brighter (whitish)
the color.
[Chroma]
The smaller the value, the more washed-out the
color. The larger the value, the more vivid the
color.
[Contrast]
Adjusts the ratio of brightness to darkness.
The smaller the value, the lower the contrast. The
larger the value, the higher the contrast.
[Red], [Green], [Blue]
Corrects the gamma value of each color.
The smaller the value, the weaker the color. The
larger the value, the stronger the color.
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This function makes the print density of the
specified barcode area suitable for reading.
[Barcode Area Definition]
Select the check box, and select an area definition
file to print from the pull-down menu.
[Details]
Click [Details] to display the [Barcode Area
Definition] dialog box.
[Density Correction]
You can adjust the print density of the specified
barcode area.
[-3] (light), [-2], [-1], [Standard], [+1], [+2], [+3]
(dark)
(Enlarged image)
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[Barcode Area Proof]
On printouts with shaded barcode areas, you can
check whether the barcode area definition is out of
alignment, and whether letters or illustrations
overlap the 1 mm (3/64") margin around the
barcode.
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When printouts are yellowish, lower the values
of red and green. To adjust other colors,
consult with the administrator for configuration.
Barcode Area Definition
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[-3] (light), [+1], [+2], [+3] can be selected
when [Image Quality] is set to [Processing
Speed Priority]. (p.121 "Image Quality")
ComColor GL Series User's Guide
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