doc/html-original/ALE/download/ale-0.8.x-user/rendering/EPPM/index.html

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  48 <p><b>[ <a href="../">Up</a> ]</b></p>
  49 <h1>EPPM Files</h1>
  50
  51 <p>EPPM is an extension to the PPM file format that allows specification of
  52 metadata.  The header of an EPPM file conforms to the following template:
  53
  54 <pre>
  55 P6#E
  56 # Tag1: Value
  57 # Tag2: Value
  58 # Tag3: Value
  59 # .
  60 # .
  61 # .
  62 Width Height Maxval
  63 Data
  64 </pre>
  65
  66 <p>Tags recognized by ALE are outlined below.
  67
  68 <h2>Black level</h2>
  69
  70 <P>The black level tag specifies a value that should be subtracted from
  71 all pixels in order to achieve linearity.  A modified version of dcraw (<a
  72 href="/darcs/dcraw">darcs repository</a>) can be used to generate files
  73 containing this tag.
  74
  75 <pre>
  76 # Black-level: &lt;value&gt;
  77 </pre>
  78
  79 <h2>Exposure tags</h2>
  80
  81 <p>Exposure tags can be used for determining tonal registration through
  82 specification of shutter speed, aperture, and ISO sensitivity (or gain).
  83
  84 <pre>
  85 # Shutter: &lt;value&gt;
  86 # Shutter: 1/&lt;value&gt;
  87 # Aperture: &lt;f-number&gt;
  88 # ISO: &lt;value&gt;
  89 # Gain: &lt;value&gt;
  90 </pre>
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  97 <i>Copyright 2003, 2004 <a href="mailto:dhilvert@auricle.dyndns.org">David Hilvert</a></i>
  98 <p>Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
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