chessboard
Arguments:
- size1>0,_size2>0,_offset1,_offset2,_angle,_opacity,_color1,...,_color2,...
Description:
Draw chessboard on selected images.
Default values:
size2=size1, offset1=offset2=0, angle=0, opacity=1, color1=0 and color2=255.
Example of use:
$ gmic
image.jpg chessboard 32,32,0,0,25,0.3,255,128,0,0,128,255

Command:
image.jpg chessboard 32,32,0,0,25,0.3,255,128,0,0,128,255