Hi, I am trying to extract the image data from various file formats and it appeared that hsmagick would be the right package to use. However, it doesn't actually work or I use it incorrectly. If you have installed hsmagick and change the value of some_png_file to some existing png file, you should see that it crashes at some random pixel. For the particular 256*256 image I had, it crashed on pixel_nr `elem` [54,56,57]. I am open to suggestions for better ways to get a Array (Int,Int) RGB from e.g. a png file. import Graphics.Transform.Magick.Images import Graphics.Transform.Magick.Types import Foreign.Storable import Control.Monad image_file_name_to_2d_array file = do himage <- readImage file let ptr_to_image = image himage himage_ <- peekElemOff ptr_to_image 0 let bounds@(_rows, _cols) = (rows himage_,columns himage_) number_of_pixels = fromIntegral _rows * fromIntegral _cols mapM (\pixel_nr -> do putStrLn ("Pixel: " ++ show pixel_nr) pixel_packet <- liftM background_color_ $ peekElemOff ptr_to_image pixel_nr let red_component = red pixel_packet putStrLn ("Pixel packet: " ++ show red_component) return red_component) [0.. number_of_pixels - 1] some_png_file = "foo.png" t = do initialize_image_library image_file_name_to_2d_array some_png_file initialize_image_library = initializeMagick Best regards, Ron de Bruijn