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authorMattia Rizzolo <mattia@mapreri.org>2014-10-03 14:05:01 +0000
committerMattia Rizzolo <mattia@mapreri.org>2014-10-03 14:05:01 +0000
commite7e90b72fd3161c5d55fed49e100781dfa3e9408 (patch)
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-<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
-<html>
-<head>
- <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
- <meta name="GENERATOR" content="Mozilla/4.6 [en] (X11; I; Linux 2.2.11 i586) [Netscape]">
- <meta name="Author" content="Oliver Rauch">
- <meta name="Description" content="scan, photocopy and fax frontend for SANE">
- <title>XSane - Enhancement</title>
-</head>
-<body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000">
-&nbsp;
-<dd>
-<img SRC="xsane-logo2.jpg" height=150 width=128 align=LEFT></dd>
-
-<br>&nbsp;
-<blockquote>
-<h1>
-<u><font color="#009900">Enhancement</font></u></h1>
-XSane uses a gamma table to do the following enhancement functions. If
-the scanner supports a custom gamma table (and the option is enabled) XSane
-uses the scanner internal gamma table with the scanner's maximum bit depth.</blockquote>
-
-<center><img SRC="sane-xsane.jpg" height=416 width=270></center>
-
-<blockquote>&nbsp;
-<dt>
-<img SRC="gamma.jpg" height=21 width=22><a NAME="GAMMA"></a><b> Gamma correction:</b></dt>
-
-<blockquote>The gamma correction is a non linear correction. Black keeps
-black and white keeps white
-<blockquote>if the gamma value is greater than 1.0 the gray intensities
-are brightned
-<br>if the gamma value is smaller than 1.0 the gray intensities are darkend</blockquote>
-</blockquote>
-
-<dt>
-<img SRC="brightness.jpg" height=21 width=22><a NAME="BRIGHTNESS"></a><b> Brightness:</b></dt>
-
-<blockquote>positive values increase the brightness of the image. All values
-are increased by the same value. 100% means a shift of the half value range
-(on 8 bits (256 values) this means a shift of 128).</blockquote>
-
-<dt>
-<img SRC="contrast.jpg" height=21 width=22><a NAME="CONTRAST"></a><b> Contrast:</b></dt>
-
-<blockquote>positive values increase the contrast of the image. Medium
-gray keeps medium gray (8 bits: 128)
-<blockquote>-100% means that all colors become medium gray
-<br>+100% means that the difference between a value and medium gray is
-doubled</blockquote>
-</blockquote>
-
-<dt>
-<img SRC="rgb-default.jpg" height=26 width=26><a NAME="RGB_DEFAULT"></a><b> RGB default:</b></dt>
-
-<blockquote>if RGB default is activated, all values for the color components
-(red, green and blue) are set to the default values (gamma=1.0, brightness=0%,
-contrast=0%). If you deactivate it, you can set different enhancement values
-for each color.</blockquote>
-
-<dt>
-<img SRC="negative.jpg" height=26 width=26><a NAME="NEGATIVE"></a><b> Negative:</b></dt>
-
-<blockquote>This option inverts the intensities (black &lt;-> white).
-It is for scanning negatives.
-<p>Negatives do not only have inverted colors, it also is necessary
-to do a color correction for each color component because the negatives
-have very different color ranges for each color.</blockquote>
-
-<dt>
-<img SRC="autoenhance.jpg" height=26 width=26><a NAME="AUTO_ENHANCEMENT"></a><b> Autoenhancement:</b></dt>
-
-<blockquote>If you press this button XSane tries to set good values
-for brightness, contrast and gamma correction independance of the selected
-part in the preview window. This does work quiet well for brightness and
-contrast, but the gamma correction normally has to be corrected manually.</b>
-<br>If RGB default is disabled, the components for each color are set
-individually.</blockquote>
-
-<img SRC="default.jpg" height=26 width=26><a NAME="ENHANCEMENT_DEFAULT"></a><b> Enhancement default:</b>
-<blockquote>Sets the enhancement values to default: gamma=1.0, brightness=0%,
-contrast=0%.</blockquote>
-
-<dt>
-<img SRC="restore.jpg" height=26 width=26><a NAME="RESTORE_ENHANCEMENT"></a><b> Restore enhancement:</b></dt>
-
-<blockquote>Restores the enhancement values from preferences.</blockquote>
-
-<dt>
-<img SRC="store.jpg" height=26 width=26><a NAME="MEMORY_ENHANCEMENT"></a><b> Store enhancement (Memory):</b></dt>
-
-<blockquote>tore selected enhancement values to preferences.</blockquote>
-</blockquote>
-
-<center>
-<hr WIDTH="100%">
-<br><b><a href="../../c/sane/xsane/doc/sane-xsane-doc.html">INDEX</a></b></center>
-
-<p><br>
-</body>
-</html>