var merlin = require('merlin');
// create a new MerlinImage with a node Buffer containing data from an image
var image = new merlin.MerlinImage(buffer);
var new_image = image.resize(300, 400);
// operations can be chained
var new_image = new_image.negative().crop(100, 100, 0, 0);
// when finished, get the buffer from the image
res.write(new_image.getBuffer());

MerlinImage.rotate(/*double*/ degrees)
MerlinImage.crop(/*int*/ width, /*int*/ height, /*int*/xoffset, /*int*/yoffset)
MerlinImage.resize(/*int*/ width, /*int*/ height)
MerlinImage.negative()