Chagall Reference   Save mask           12.5.93
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   The mask of the current picture will be saved
   in the ESM-format under a name of your choosing.
   
   While the standard pre-selected file-extension for
   masks is 'MSK', the mask-format corresponds exactly
   to the ESM-format for halftone pictures, so that
   Chagall can load and modify masks just like ordinary
   pictures.

