Chagall Reference   Special <F4>        12.5.93
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   The 'Special' toolbox collects together some
   special functions for modifying the picture 
   such as filters, fill and gradient-fill functions.

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  |     LUTLUT      |     FilterFILTER     | Convert pictureCONVERT |
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  |  Grad-fillGRADFILL   | Change coloursCOL_CH |      FillFILL       |
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  | DensitometerDENSI |
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