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<article lang="&language;">
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<title>Monitor Gamma</title>
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<firstname>Michael</firstname>
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<surname>v.Ostheim</surname>
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<address><email>ostheimm@users.berlios.de</email></address>
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<!-- TRANS:ROLES_OF_TRANSLATORS -->
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<date>2009-11-16</date>
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<releaseinfo>4.4.0</releaseinfo>
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<keyword>KDE</keyword>
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<keyword>System Settings</keyword>
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<keyword>Monitor</keyword>
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<keyword>Calibration</keyword>
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<keyword>Gamma</keyword>
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<sect1 id="introduction">
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<title>Introduction</title>
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<para>This module is a tool for monitor gamma correction. With proper gamma
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settings, your display (websites, images, &etc;) will look the same on your
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monitor as on other monitors.</para>
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<para>It allows you to alter the monitor's gamma correction of the
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&X-Server;. But that's not all to do. For good results you have to set the
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correct brightness, contrast and color balance of your monitor. This
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may be difficult and you have to repeat every step several times.
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For perfect results you need really good (and expensive) hardware.</para>
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<para>Use the four sliders to define the gamma correction either as a single
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value, or separately for the red, green and blue components. The &X-Server;
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default setting for gamma is 1.00 (&Mac; 1.80, WinXX 2.20). The test images help
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you to find proper settings.</para>
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<para>To store the gamma settings system wide, enable the option <guilabel>Save
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settings system wide</guilabel>. The system settings will be restored at next &X-Server;
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startup. You need root access to use this option. Use this if you want to
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correct the gamma settings for all users and graphical environments on this
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<para>To store the gamma settings to your personal &kde; configuration, do not
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enable that option. The user settings will be restored at next &kde; startup and
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replace temporary the system gamma settings. The system settings are not removed by
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that and will be restored at next &X-Server; startup.</para>
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<para>On multi head systems, select the screen you want to alter with the combo
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box. This will also work with xinerama enabled. If you want to set all screens
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to the same gamma values, enable the <guilabel>Sync screens</guilabel> option. On systems with only
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one screen this option will take no effect.</para>
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<sect1 id="using_test_images">
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<title>Using the Test Images</title>
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<para>This module provides six different test pictures selectable from the drop down box at the bottom of the window.</para>
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<title>Grey Scale Test Image</title>
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<para>You should be able to see the following:</para>
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<para>A grayscale with 20 different sections</para>
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<para>The darkest section pure black</para>
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<para>The lightest section pure white</para>
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<para>No hint of any color in the gray tones</para>
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<para>If you cannot see all of the 20 sections, use your monitors contrast settings
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or the <guilabel>Gamma</guilabel> slider to correct this. If black is not pure black,
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try to darken the monitor, if white is not pure white, try to lighten
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it. If you see any colors in the gray tones alter the color balance settings of
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your monitor or the <guilabel>Red</guilabel>, <guilabel>Green</guilabel> and <guilabel>Blue</guilabel> slider.</para>
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<sect2 id="RGB-Scale">
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<title>RGB Scale Test Picture</title>
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You should be able to see three strips, each with 16 sections of red,
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green or blue tones. The darkest sections should be pure black, the brightest
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should be pure red, green or blue. If you don't see all sections of
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a color strip, try to lighten or darken this color.</para>
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<sect2 id="CMY-Scale">
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<title>CMY Scale Test Picture</title>
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You should be able to see three strips, each with 11 sections of cyan,
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magenta or yellow tones. The brightest sections should be pure white, the darkest
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should be pure cyan, magenta or yellow.</para>
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<para>If you cannot see all cyan sections, try to lighten or darken red</para>
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<para>If you cannot see all magenta sections, try to lighten or darken green</para>
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<para>If you cannot see all yellow sections, try to lighten or darken blue</para>
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<sect2 id="advanced">
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<title>Advanced Test Pictures</title>
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The following three pictures show you the abilities of your monitor at
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three points of the gray spectrum. If you cannot see all of the details,
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don't be worry, or buy better hardware.
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<sect3 id="dark-gray">
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<title>Dark Gray Test Picture</title>
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You should be able to see 10 different rectangles of dark gray within a
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black box. The chart shows you 1% steps from black.
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<sect3 id="mid-gray">
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<title>Mid Gray Test Picture</title>
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This picture shows you 11 gray rectangles within a 50% gray box. You should be
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able to see all of the rectangles except the middle one. The rectangles represent
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the steps from 45% to 55% gray.
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<sect3 id="light-gray">
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<title>Light Gray Test Picture</title>
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You should be able to see 10 different rectangles of light gray within a white box.
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The chart shows you 1% steps from white.
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