Get an image from a matrix of signed integers

[giordano]

@phlavenk

The problem is, the image values are meaningful for the range of <0, max_type_value> or <0,1> for floating point images

Why does a Matrix{Gray{AsbtractFloat}} with values outside [0,1] work?

I thought that Fixed type would have taken care of mapping the signed integers to numbers that can be digested by Images.jl, just like Normed for unsigned integers.

@phlavenk

So you have to at least convert to UInt.

How to map signed integers to unsigned integers? Yesterday I came up with a method to do this (just add typemax(Int) + 1), but doesn’t work with Int64.