Pitney Bowes RISO ComColor Printer - Manual (Page 56)

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1 Printer Driver
ComColor Series User’s Guide 03
● Gamma control
Adjust the lightness, chroma, contrast, and RGB
gamma value.
Select the [Gamma control] check box and click [Details]
to display the [Gamma control] dialog box. Specify 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 (ratio of brightness to darkness)
The smaller the value, the lower the contrast. The
larger the value, the higher the contrast.
● Red, Green, Blue
Adjust the gamma value of colors.
The smaller the value, the weaker the color. The
larger the value, the stronger the color.
When printouts are yellowish, lower the values of
red and green. For adjustment of other colors, see
"Color Profile" (p. 1-10) or follow the
administrator's advice.
● Screening
Specify the method of halftone processing.
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]
Express gradation through the density of dots. The
higher the density, the darker the gradation. The
lower the density, the lighter the gradation.
[Dot process (70 lpi)], [Dot process (100 lpi)]
Express 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.
70 lines per inch 100 lines per inch
(Enlarged image)