Output to STDERR a measure of the differences between images according to the type given metric.

system("compare -metric PSNR monochrome.jpg emboss.jpg difference.png 2>&1");

Mode of operation.

Vary the brightness, saturation, and hue of an image.

$cmd= "$input -modulate 125,75,100"; 
exec("convert $cmd modulate.jpg");

Report image moments.

system(" identify $input -moments");

( Used with identify.

Rubblewebs\imagemagick\operators\images\input.jpg JPEG 213x160 213x160+0+0 8-bit sRGB 34.9KB 0.000u 0:00.000 )

Monitor progress.

Transform the image to black and white.

$cmd = "$input -monochrome "; 
exec("convert $cmd monochrome.jpg");

Morphs an image sequence.

$cmd = "$input hald_clut.jpg colorspace.jpg -morph 20"; 
exec("convert $cmd morph.gif");
 

( File sizes can get quite large. )

apply a morphology method to the image.

A simple alias for the -layers method "mosaic".

Name an image.

Replace every pixel with its complementary color.

$cmd = "$input -negate "; 
exec("convert $cmd negate.jpg");

Add and remove noise

Increase the contrast in an image by stretching the range of intensity values.

$cmd = "$input -normalize "; 
exec("convert $cmd normalize.jpg");