1. An electronic system for generating a modified image from an original image comprising: a plurality of input devices, each for providing electronic color pixel representations of original images; a storage device for storing a plurality of color transform definitions, each transform definition representing an input/output relation for color values; a user interface manipulable by a user to select multiple transform definitions; a transform composer for composing the user-selected multiple transform definitions into a composite transform definition, said composite transform definition being equivalent to the sequential application of the multiple transform definitions; and an image processor transforming the colors of the electronic color pixel representation of the original image through a single application of the composite transform definition, thereby generating a modified image.