The script timelessCreateEmptyImage
does exactly what its name says: It creates an empty image (which is a black image with minimum intensity = maximum intensity = 0). Possible applications for empty images are:
However, the empty image is not created from scratch. One has to provide another image which serves as a basis. First, the basis image is copied so the original is not erased. Then, the size and the amount of pixels from the basis image is kept and the intensity is set to zero.