[PHP-WIN] edge detection

does anyone know how to make an edge detection using php ??? -- PHP Windows Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php

[PHP-WIN] alpha png to gif with transparent

IT seem to be impossible as the alpha png is 24 bit and gif can only be 256 color.. however, is there any alternative which at least make the generated transparent gif look good? this is my code.. but itdin work