合并

GraphicsMagick supports compositing one image on top of another. This is exposed through gm.composite(). Its first argument is an image path with the changes to the base image, and an optional mask image.

Currently, gm.composite() only accepts file paths.

gm.composite(other [, mask])

gm('/path/to/image.jpg')
.composite('/path/to/second_image.jpg')
.geometry('+100+150')
.write('/path/to/composite.png', function(err) {
    if(!err) console.log("Written composite image.");
});