id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
22	Represent bitmaps as arrays of tuples	Ben Lippmeier		"Representing bitmaps as a 3D array isn't ideal because there's no way to perform a map over all the pixels.

With this representation
   {{{Array DIM3 Word8}}}

Suppose we want to convert the image to greyscale in a single operation. We'd really need a function like:

   {{{map1 :: (Array DIM1 a -> Array DIM1 a) -> Array DIM3 a -> Array DIM3 a }}}

However, that doesn't work because we can't guarantee that the worker function always returns an array of the same length as the original. Because of this we can't guarantee that the result is rectangular.

If instead we had represented bitmaps as

   {{{Array DIM2 (Word8, Word8, Word8}}}

Then we could use the original map function and there'd be no problem.
"	enhancement	new	normal		algorithms	2.0.0.3