Version 2.5: Re-enabled diagonal reflection. Moved into the bundle (so it doesn't require a PLaneT install). Added some picture variables. Rewrote a bunch of things for compatibility with 5.1. Version 2.4: Added change-to-color and map3-image. Cleaned up documentation. Version 2.3: Renamed files from .ss to .rkt, so they work better with Racket. Added map-image, build-image, name->color, and friends; re-fixed bug in rotate-cw and rotate-ccw. Version 2.2: Fixed bug in rotate-cw and rotate-ccw; restored reflect-vert and reflect-horiz; added with-input-from-url. Version 2.1: Added argument type-checking. And reflection primitives are now present but produce error message, rather than being missing. Version 2.0: now fully compatible with 2htdp/image and 2htdp/universe. No pinholes; temporarily disabled reflection primitives. Version 1.6: fixed same transparency bug for 4.2.4 Version 1.5: fixed same transparency bug for 4.2.3 Version 1.4: fixed transparency bug for 4.2.2 Version 1.3: initial release, for DrScheme 4.2.4 Version 1.2: initial release, for DrScheme 4.2.3 Version 1.1: initial release, for DrScheme 4.2.2