The Multi menu provides a wide variety of useful commands for composing images and transforming images from one domain or format into another. The Combine and Compare commands each create a new image from a composition of two images.
Complex commands convert complex format images to real format images and vice-versa.
The Combine command computes a weighted combination of two images. Parameters are the two images, their respective weights, and the combination function. Each image is chosen from a pop-up menu that lists all images that are currently open. The combination function is chosen from a pop-up menu. I and J as where and are the weights for the first and second image, respectively, as specified in the dialog.