Two questions about numbers

[bakert]

(1)

Hexgradient = Image.new('L', (1, RGB_MAX_0))

Shouldn't that be (0, RGB_MAX_0)? 0-255. I'm not totally sure what this does but it seems like 1 and 256 go together and 0 and 255 go together. Not 1 and 255.

(2)

#map the gradient
for x in range(QUARTER):
    Hexgradient.putpixel((0, x), RGB_MAX_0)
for x in range(QUARTER):
    Hexgradient.putpixel((0, QUARTER + x), RGB_MAX_0 - x)
for x in range(HALF):
    Hexgradient.putpixel((0, BAD_HALF + x), BAD_THREE_QUARTERS - int(1.5 * x))

# create a horizontal gradient...
gradient = Image.new('L', (RGB_MAX_0, 1))

#map the gradient
for x in range(HALF):
    gradient.putpixel((x, 0), int(1.5 * x))
for x in range(QUARTER):
    gradient.putpixel((BAD_HALF + x, 0), BAD_THREE_QUARTERS + x)
for x in range(QUARTER):
    gradient.putpixel((BAD_THREE_QUARTERS + x, 0), RGB_MAX_0 - 1)

I called these constants BAD_HALF and BAD_THREE_QUARTERS because they're very close to that proportion of the relevant RGB_MAX but they aren't precisely. I wonder if they should be precisely or if they've been very finely judged by eye.