Commands Used with the IMGCTRL, IMGOP and PICFILL Functions

CONVERT

Converts an image to the specified image type and depth

Syntax
Details
Example

Syntax

rc=IMGOP(task-id, 'CONVERT', type);

type

specifies the type of image to convert to:

'GRAY': a monochrome (black and white) image
'CMAP': a color-mapped image
'RGBA': an RGB image

Type: Character

Details

CONVERT performs dithering, quantizing, and other operations in order to reduce an image to a simpler form. It can also create a two-color (black and white) RGB image by converting a monochrome image to an RGBA image. Images that are originally gray-scale or black and white cannot be colorized. CONVERT acts on the currently selected image.

Example

Convert an RGB image to a dithered monochrome image:

rc=imgop(task-id,'READ','rgb.tif');
rc=imgop(task-id,'CONVERT','GRAY');
rc=imgop(task-id,'WRITE','gray.tif');

Convert the GRAY image back to RGB. Because all color information is lost, the final RGB image has only two colors:

rc=imgop(task-id,'READ','gray.tif');
rc=imgop(task-id,'CONVERT','RGBA');
rc=imgop(task-id,'WRITE','rgb.tif');

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