image flipping - thought request

hi all! i would like to flip images to n' so let's say i had image like this : ---------- | | | | | | | | ---------* i want it to show as : | - - - | | - | | | | | | - | * - - - | so in this case, $degrees = 90 . i have sneaky suspicion this would require server to work much harder then i'd like so altering the image by other means should be done but jic had to ask for thoughts on the matter. thank you, philip -- be outside the box.