3 def convert_256(image_array)
4 length = image_array.length
7 out_image_array = Array.new(length).map{ Array.new(length) }
11 if(max < image_array[x][y])
12 max = image_array[x][y]
14 if(min > image_array[x][y])
15 min = image_array[x][y]
20 conversion = 255/(max - min)
23 out_image_array[y][x] = ((image_array[x][y] - min)*conversion).to_i
26 return out_image_array