image/tiff                     tiff tif         # TIFF image file
image/x-cmu-raster             ras              #
image/x-portable-anymap        pnm              #
image/x-portable-bitmap        pbm              #
image/x-portable-graymap       pgm              #
image/x-portable-pixmap        ppm              #
image/x-rgb                    rgb              # RGB Image File

  <mime-type type="image/x-portable-bitmap">
    <sub-class-of type="image/x-portable-anymap"/>
    <acronym>PBM</acronym>
    <_comment>Portable Bit Map</_comment>
    <magic priority="50">
      <match value="P1" type="string" offset="0"/>
      <match value="P4" type="string" offset="0"/>
    </magic>
    <glob pattern="*.pbm"/>
  </mime-type>

  <mime-type type="image/x-portable-graymap">

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