John Kozak
data Pixel a = Pixel !a !a !a deriving Show
I use ImageMagick to load the image, then build an Array of Pixel Floats. Building the array takes 45 seconds on a 2.5Ghz P4 with code compiled -O2, which seems slow to me - are my expectations unrealistic? I've tried various UNPACK things which didn't make much difference.
Are you using UArrays? If you're going to read the whole image anyway, they will probably be faster than the normal arrays. Also, I read somewhere that operations are often specialized for Double but not Float - since you talk about image loading rather than processing, it may be worth it to use Floats to save space, even if Doubles could be faster. -kzm -- If I haven't seen further, it is by standing in the footprints of giants