I haven't used it myself, but check out the get-argb-pixels method of bitmaps:
http://docs.racket-lang.org/gui/bitmap_.html?q=bitmap%25#%28meth._%28%28%28lib._mred/main..rkt%29._bitmap~25%29._get-argb-pixels%29%29 Carl Eastlund On Sun, Nov 21, 2010 at 8:50 AM, 김태윤 <kty1...@gmail.com> wrote: > hello~ > I want to convert image to vector or array or list for mask or alpha > operating > can I ask you how to convert image or bitmap to operatable data? > thanks in advanced _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users