tkimg/doc/formats.htm


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<?xml version="1.0" encoding="iso-8859-1"?>
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	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>Img Documentation</title>
  <meta http-equiv="Content-Type" content="text/html" />
</head>

<body>
<h1>Img Manual</h1>

<table width="100%">
  <tbody>
    <tr>
      <td><a href="index.htm">Introduction</a></td>
      <td><a href="install.htm">Installation</a></td>
      <td><a href="formats.htm">Format handlers</a></td>
      <td><a href="library.htm">External libraries</a></td>
    </tr>
  </tbody>
</table>

<h3>Format handlers</h3>
<dl>
  <dt>The pixmap image type can be used as follows:</dt>
    <dd>image create pixmap -file </dd>
  <dt>or</dt>
    <dd>image create pixmap -data ;#(in XPM format)</dd>
</dl>
<dl>
  <dt>The photo image type works the same:</dt>
    <dd>image create photo -file </dd>
  <dt>or</dt>
    <dd>image create photo -data ;#(base-64 encoding required with Tk8.2 and lower)</dd>
</dl>

<p>Valid format specifiers for reading photo's:</p>

<table width="100%">
  <tbody>
    <tr>
      <td width="10%">&nbsp;</td>
      <td>"bmp"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"gif -index &lt;n&gt;"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"jpeg -fast -grayscale"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"png"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"tiff"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"xbm"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"xpm"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"postscript -index &lt;n&gt; -zoom &lt;x&gt; &lt;y&gt;"</td>
      <td>(-index not yet implemented) <!--<tr><td>&nbsp;<td>"pdf -index &lt;n> -zoom &lt;x> &lt;y>"<td>(-index not yet implemented)-->
      </td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"window"</td>
      <td>(works only with "-data", not "-file")</td>
    </tr>
  </tbody>
</table>

<p>Valid format specifiers for writing photo's:</p>

<table width="100%">
  <tbody>
    <tr>
      <td width="10%">&nbsp;</td>
      <td>"bmp"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"gif -interlaced &lt;bool&gt;"</td>
      <td>(-interlaced not yet implemented)</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"jpeg -quality &lt;n&gt; -smooth &lt;n&gt; -grayscale -optimize

        -progressive"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"png Author &lt;name&gt; Title &lt;title&gt; Description ....."<br />
        Each pair of arguments will add a named text chunk to the file.</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"tiff -compression &lt;compression&gt; -byteorder &lt;byteorder&gt;"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"xbm"</td>
      <td></td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>"xpm"</td>
      <td></td>
    </tr>
  </tbody>
</table>

<p>The format options have the following meaning:</p>

<table width="100%">
  <tbody>
    <tr>
      <td width="10%">&nbsp;</td>
      <td>-background C:</td>
      <td>use color C as background color for transparent parts of the
      image.</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-byteorder:</td>
      <td>Byteorder for TIFF file. Should be one of bigendian, littleendian,
        network, smallendian or {}. Default: {}</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-compression:</td>
      <td>Compression for TIFF file. Should be one of none, jpeg, packbits or
        deflate. Default: none.</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-fast:</td>
      <td>Fast, low-quality processing.</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-grayscale:</td>
      <td>Force incoming image to grayscale/ Create monochrome file.</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-index N:</td>
      <td>Select one of the sub-images (GIF and postscript only, not yet
        implemented for postscript). Default value: 0</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-interlaced N:</td>
      <td>N=1: interlaced. N=0: non-interlaced (not yet implemented).</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-optimize:</td>
      <td>Optimize Huffman table.</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-progressive:</td>
      <td>Create progressive file (JPEG only).</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-quality N:</td>
      <td>Compression quality (0..100; 5-95 is useful range). Default value:
        75</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-smooth N:</td>
      <td>Perform smoothing (10-30 is enough for most GIF's). Default value:
      0</td>
    </tr>
    <tr>
      <td>&nbsp;</td>
      <td>-zoom X Y:</td>
      <td>Multiply image size by given scale factors. If Y is missing, the
        default is the same as X. X and Y are allowed to be in floating point
        format, but they are rounded to the nearest practically possible
        value. For postscript this means the zoom factors should be multiples
        of 1/72.</td>
    </tr>
  </tbody>
</table>
</body>
</html>