Make a copy of an image (or images).

$cmd = "$input ( +clone -thumbnail x480 -write 480_wide.jpg". 
" +delete ) -thumbnail \"100x100!\" "; 
exec("convert $cmd clone.jpg");
    

Replace the channel values in the first image using each corresponding channel in the second image as a color lookup table.

$cmd = "$input2 $input3 -clut";  
exec("convert $cmd clut.jpg");
 

( Replace the channel values in the first image using each corresponding channel in the second image as a color lookup table. )

Fully define the look of each frame of an GIF animation sequence, to form a 'film strip' animation.

( See the Layers page. )

Apply a color correction to the image

$cmd = "$input -color-matrix ".
"  \" 1.5 0.0 0.0 0.0, 0.0, -0.157 ".
"    0.0 1.5 0.0 0.0, 0.0, -0.157 ".
"   0.0 0.0 1.5 0.0, 0.0, -0.157 ".
"   0.0 0.0 0.0 1.0, 0.0, 0.0 ".
"   0.0 0.0 0.0 0.0, 1.0, 0.0 ".
"   0.0 0.0 0.0 0.0, 0.0, 1.0\"";   
exec("convert $cmd color-matrix.jpg");

Colorize the image by an amount specified by value using the color specified by the most recent -fill setting.

$cmd = "$input -fill Blue -colorize 30 "; 
exec("convert $cmd colorize.jpg");
     

( Colorize the image by an amount specified by value using the color specified by the most recent -fill setting. )

Define the colormap type.

( X server required. )

Set the preferred number of colors in the image.

$cmd = "$input -colors 10 "; 
exec("convert $cmd colors.jpg");
    

Set the image colorspace.

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

Combine one or more images into a single image.

$cmd = " separate-0.png separate-1.png separate-2.png". 
" -channel RGB -combine "; 
exec ("convert $cmd combine.png");

Embed a comment in an image.

$cmd = "$input -comment \"Comment imbeded in image\" "; 
exec("convert $cmd comment.jpg");
 

Mathematically and visually annotate the difference between two images.

$cmd = "$input annotate.jpg -metric RMSE -compare "; 
exec("convert $cmd compare.jpg");

( Visually display the difference. You can get a numerical output as well. )

Perform complex mathematics on an image sequence

Set the type of image composition.

( See the compose page. )

Perform alpha composition on the current image sequence.

$cmd = "$input $input1 -gravity center".
" -composite "; 
exec("convert $cmd composite.jpg");

( You can use the same methods of overlaying as compose.
Note the images are in the oposite order to compose. )