[plt-scheme] image-snip stuff

[Stephen Bloch]

What does it mean when two images satisfy
(= (image-width pic1) (image-width pic2))
(= (image-height pic1) (image-height pic2))
(equal? (image->alpha-color-list pic1) (image->alpha-color-list pic2))

but not

(image=? pic1 pic2)

?

Stephen Bloch
sbloch at adelphi.edu