Commands Used with the IMGCTRL, IMGOP and PICFILL Functions

DITHER_BW

Dithers the selected image to a monochrome black and white image

Syntax
Details
Example

Syntax

rc=IMGOP(task-id, 'DITHER_BW');

region-id=PICFILL(graphenv-id, type, ulr, ulc,
lrr, lrc, source<, 'DITHER_BW'<, arguments>>);

Details

This command reduces an image to a black-and-white image. DITHER_BW is much more efficient for this task than the general purpose DITHER command.

Example

Dither an image either to black and white or to a color map:

if 
(dither=1) then
   do;
      rc=imgop(task-id,'DITHER_BW');
      rc=imgop(task-id,'PASTE');
   end;
if (dither=2) then
   do;
      rc=imgop(task-id,'GENERATE_CMAP',
         'COLORRAMP',5,5,4);
      rc=imgop(task-id,'DITHER');
      rc=imgop(task-id,'PASTE');
   end;

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