1) Just use Data.Word.Word8 instead of the second Int in your type sig
for IOArray
2) Use getElems to get a [Word8]
3) Data.ByteString.pack converts a [Word8] into a ByteString

Michael

I am currently using a list of tuples - [(Int,Int,Int)] to represent an image buffer. You can see it in the�getImageByteString

function at https://github.com/ckkashyap/Chitra/blob/master/RFB/Encoding.hs

Looks like this is pretty slow, and hence I am exploring Arrays.

I wonder if working with [Word8] will also suffer from performance hit?

Regards,

Kashyap