Canon CanoScan D1250U2F CanoScan D1250U2 ScanGear CS-U 6.3 for Win Guide - Page 36

By increasing the Scanner Gamma, Gamma Sheet

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chapter 3 What is on the screen? Contents Glossary Index Gamma Sheet When the Gamma button is clicked, the Gamma sheet is displayed. Gamma refers to a process where mid-tones are shifted so that the lighter colors are lightened and darker colors are darkened. For example, let us say you scanned a photograph of a subject in a boat in a tree-lined lake and the shadows of the trees are dark enough and the white of the boat is light enough, but the blue in the sky, the blue of the water, and the blue of the subject's clothing all look the same. By increasing the Scanner Gamma value of the image, the sky might become lighter and the water darker, giving a better contrast to the image. The Monitor Gamma value is a reciprocal number of the Scanner Gamma value. Channel If you want to select one of the primary colors (RGB) to adjust the gamma value, click the Channel down-arrow and select a color or leave the settings at Master to adjust all the colors. 36

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36
chapter 3
What is on the
screen?
Glossary
Contents
Index
Gamma Sheet
When the Gamma button is clicked, the Gamma sheet is displayed.
Gamma refers to a process where mid-tones are shifted so that the lighter
colors are lightened and darker colors are darkened. For example, let us say
you scanned a photograph of a subject in a boat in a tree-lined lake and
the shadows of the trees are dark enough and the white of the boat is light
enough, but the blue in the sky, the blue of the water, and the blue of the
subject’s clothing all look the same.
By increasing the Scanner Gamma
value of the image, the sky might become lighter and the water darker,
giving a better contrast to the image. The Monitor Gamma value is a
reciprocal number of the Scanner Gamma value.
Channel
If you want to select one of the primary colors (RGB) to adjust the gamma
value, click the Channel down-arrow and select a color or leave the settings
at Master to adjust all the colors.