File: sane-xsane-color-management-doc.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
   <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
   <meta name="GENERATOR" content="Mozilla/4.74 [en] (X11; U; Linux 2.2.18 i686) [Netscape]">
   <meta name="Author" content="Oliver Rauch">
   <meta name="Description" content="scan, photocopy and fax frontend for SANE">
   <title>XSane - Color management</title>
</head>
<body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000">


<table>
<tr>
<td width=200>
<img SRC="xsane-logo.jpg" alt="XSane-logo" hspace=30 align=TOP>
</td>
<td>
<blockquote>
<h1><u><font color="#009900">Color management</font></u></h1>
</blockquote>
</td>
</tr>
</table>


<hr WIDTH="100%">

<table>
<tr>
<td valign=TOP width="200" bgcolor="#E0E0BA">
<br>
<a href="sane-xsane-doc.html">Index</a>
<br>
<br>
<font color="#000000">XSane mode:</font>
<img SRC="xsane-target.jpg" alt="xsane-target">
<ul>
<li><a href="sane-xsane-viewer-doc.html">Viewer mode</a></li>
<li><a href="sane-xsane-save-doc.html">Save mode</a></li>
<li><a href="sane-xsane-copy-doc.html">Copy mode</a></li>
<li><a href="sane-xsane-multipage-doc.html">Multipage mode</a></li>
<li><a href="sane-xsane-fax-doc.html">Fax mode</a></li>
<li><a href="sane-xsane-email-doc.html">E-mail mode</a></li>
<li><a href="sane-xsane-gimp-doc.html">Gimp plugin</a></li>
</ul>
<br>
<a href="sane-xsane-scan-options-doc.html">Scan options</a>
<br>
<br>
<a href="sane-xsane-medium-definition-doc.html">Medium selection</a>
<br>
<br>
<a href="sane-xsane-color-management-doc.html">Color management</a>
<br>
<br>
<a href="sane-xsane-color-correction-doc.html">Color correction:</a>
<ul>
<li><a href="sane-xsane-color-correction-doc.html#GAMMA">Gamma correction</a></li>
<li><a href="sane-xsane-color-correction-doc.html#BRIGHTNESS">Brightness</a></li>
<li><a href="sane-xsane-color-correction-doc.html#CONTRAST">Contrast</a></li>
<li><a href="sane-xsane-color-correction-doc.html#THRESHOLD">Threshold</a></li>
<li><a href="sane-xsane-color-correction-doc.html#RGB_DEFAULT">RGB default</a></li>
<li><a href="sane-xsane-color-correction-doc.html#NEGATIVE">Negative</a></li>
<li><a href="sane-xsane-color-correction-doc.html#AUTOENHANCEMENT">Autoenhancement</a></li>
<li><a href="sane-xsane-color-correction-doc.html#ENHANCEMENT_DEFAULT">Default</a></li>
<li><a href="sane-xsane-color-correction-doc.html#RESTORE_ENHANCEMENT">Restore</a></li>
<li><a href="sane-xsane-color-correction-doc.html#STORE_ENHANCEMENT">Store</a></li>
<li><a href="sane-xsane-histogram-doc.html">Histogram window</a></li>
<li><a href="sane-xsane-preview-doc.html#PIPETTE_WHITE">Pipette functions</a></li>
</ul>
<br>
<a href="sane-xsane-standard-doc.html">Standard options window</a>
<br>
<br>
<a href="sane-xsane-advanced-doc.html">Advanced options window</a>
<br>
<br>
<a href="sane-xsane-preview-doc.html">Preview:</a>
<ul>
<li><a href="sane-xsane-preview-doc.html#PIPETTE_WHITE">Pipette white</a></li>
<li><a href="sane-xsane-preview-doc.html#PIPETTE_GRAY">Pipette gray</a></li>
<li><a href="sane-xsane-preview-doc.html#PIPETTE_BLACK">Pipette black</a></li>
<li><a href="sane-xsane-preview-doc.html#UNZOOM">Unzoom</a></li>
<li><a href="sane-xsane-preview-doc.html#ZOOM_OUT">Zoom out</a></li>
<li><a href="sane-xsane-preview-doc.html#ZOOM_IN">Zoom in</a></li>
<li><a href="sane-xsane-preview-doc.html#UNDO_ZOOM">Undo zoom</a></li>
<li><a href="sane-xsane-preview-doc.html#AUTOSELECT">Autoselect scanarea</a></li>
<li><a href="sane-xsane-preview-doc.html#AUTORAISE">Autoraise scanarea</a></li>
<li><a href="sane-xsane-preview-doc.html#SELECT_VISIBLE_AREA">Select visible area</a></li>
<li><a href="sane-xsane-preview-doc.html#DELETE_PREVIEW_CACHE">Delete preview cache</a></li>
<li><a href="sane-xsane-preview-doc.html#PRESET_AREA">Preset area</a></li>
<li><a href="sane-xsane-preview-doc.html#ROTATION">Rotation</a></li>
<li><a href="sane-xsane-preview-doc.html#ASPECT_RATIO">Aspect ratio</a></li>
<li><a href="sane-xsane-preview-doc.html#RGB_VALUES">RGB values</a></li>
<li><a href="sane-xsane-preview-doc.html#SELECT_SCAN_AREA">Select scanarea</a></li>
<li><a href="sane-xsane-preview-doc.html#MOVE_SCAN_AREA">Move scanarea</a></li>
</ul>
<br>
<a href="sane-xsane-batch-scan-doc.html">Batch scan:</a>
<ul>
<li><a href="sane-xsane-batch-scan-doc.html#BATCH_SCAN_EMPTY">Empty batch list</a></li>
<li><a href="sane-xsane-batch-scan-doc.html#BATCH_SCAN_OPEN">Open batch list</a></li>
<li><a href="sane-xsane-batch-scan-doc.html#BATCH_SCAN_SAVE">Save batch list</a></li>
<li><a href="sane-xsane-batch-scan-doc.html#BATCH_SCAN_ADD">Add area to list</a></li>
<li><a href="sane-xsane-batch-scan-doc.html#BATCH_SCAN_DELETE">Remove selection</a></li>
<li><a href="sane-xsane-batch-scan-doc.html#BATCH_SCAN_RENAME">Rename selection</a></li>
<li><a href="sane-xsane-batch-scan-doc.html#BATCH_SCAN_ROTATE">Rotate image</a></li>
<li><a href="sane-xsane-batch-scan-doc.html#BATCH_SCAN_MIRROR">Mirror image</a></li>
</ul>
<br>
<font color="#000000">Setup:</font>
<ul>
<li><a href="sane-xsane-setup-copy-doc.html">Copy setup</a></li>
<li><a href="sane-xsane-setup-display-doc.html">Display setup</a></li>
<li><a href="sane-xsane-setup-enhancement-doc.html">Enhancement setup</a></li>
<li><a href="sane-xsane-setup-fax-doc.html">Fax setup</a></li>
<li><a href="sane-xsane-setup-filetype-doc.html">Filetype setup</a></li>
<li><a href="sane-xsane-setup-email-doc.html">E-mail setup</a></li>
<li><a href="sane-xsane-setup-save-doc.html">Saving setup</a></li>
<li><a href="sane-xsane-setup-color-management-doc.html">Color management setup</a></li>
</ul>
</td>



<td VALIGN=TOP BGCOLOR="#FFFFFF">
<br>
<center><img SRC="xsane-color-management-main-window.jpg"
    alt="XSane-main-window-with-color-management"></center>
<br>
<br>
<blockquote>
When you scan an image with color management disabled then you often get an image that does not look very good.
The colors do not look natural, the contrast is bad, the image is too dark etc.

The reason for this is that each device interprets a color e.g. represented by a red, green and blue value in
its own way.
<p>
When you want a display or a printer to produce an image with the colors of a photo that you want to scan with a scanner
then you need to tell your system how each device interprets colors. This is done with ICC/ICM profiles.
When you have at least an ICC/ICM profile for your scanner and for your display then you can enable the color management of XSane.
Please make sure that you filled out the
<a href="sane-xsane-setup-color-management-doc.html">color management setup</a>
correct before you enable it, otherwise you will get a lot of error messages.
<br>
<br>
<br>
<a NAME="ENABLE_CMS"></a><b>Enable color management:</b><br>
&nbsp;&nbsp;
<img SRC="xsane-enable-color-management.jpg" alt="enable-color-management">

<blockquote>
To enable the color management activate it in the <i>Preferences</i> menu.
When you do this then the gamma, contrast and brightness options are disabled.
</blockquote>

<a NAME="CMS_FUNCTION"></a><b>Color management function:</b><br>
&nbsp;&nbsp;
<img SRC="xsane-cms-function.jpg" alt="cms-function">
<blockquote>
There are three different functions available when color management is enabled:
<ul>
  <li>
    <a NAME="EMBED_ICM_PROFILE"></a><b>Embed scanner ICM profile</b>
    <br>
    The image is saved with the original image data, no color transformation is
    done. The ICM profile is embedded to the image file. Programs that support
    color management know how to correct the colors.
    <br>
    Advantages:
    <ul>
      <li>no loss of information</li>
    </ul>
    Disadvantages:
    <ul>
      <li>a lot of programs are not able to handle embedded profiles</li>
    </ul>
    Usage:
    <ul>
      <li>image archive, image manipulation with all color corrections,
      professional printing</li>
    </ul>
    <br>
    When the selected file format does not support the embedded profiles then
    the image is tranformed to sRGB.
    <p>
  </li>

  <li>
    <a NAME="CONVERT_TO_SRGB"></a><b>Convert to sRGB</b>
    <br>
    The image is converted to sRGB, no ICM profile is embedded.
    <br>
    Advantages:
    <ul>
      <li>all programs can handle the color corrected image</li>
    </ul>
    Disadvantages:
    <ul>
      <li>sRGB does not cover all visible colors</li>
      <li>when you do any further color correction then you lose color
      information that can result in visible color steps</li>
    </ul>
    Usage:
    <ul>
      <li>web publication, office documents, image manipulation only when no color
      correction is done, home and office printing</li>
    </ul>
    <p>
  </li>

  <li>
    <a NAME="CONVERT_TO_WORKING_COLOR_SPACE"></a><b>Convert to working color space</b>
    <br>
    The image is converted to the working color space you selected in the color
    management setup. The ICM profile of the working color space is embedded
    to the image file.
    <br>
    Advantages:
    <ul>
      <li>There are color spaces that do cover the visible colors better than sRGB
      does</li>
    </ul>
    Disadvantages:
    <ul>
      <li>when you do any further color correction then you lose color
      information that can result in visible color steps</li>
    </ul>
    Usage:
    <ul>
      <li>image archive, image manipulation with (may be limited) color correction,
      professional printing</li>
    </ul>
    <p>
  </li>
</ul>
</blockquote>

</blockquote>
</td>
</tr>
</table>

<hr WIDTH="100%">

<blockquote>
Author: <a href="mailto:Oliver.Rauch@xsane.org">Oliver Rauch</a>
</blockquote>

</body>
</html>