I got float RGB values, but PIL method 'putpixel' doesn't accept float type numbers

Question

I am using putpixel method from PIL module. It seems that it expects that r,g,b values are integers. I am trying to draw a mandelbrot set and the formula I'm using to calculate color returns float type numbers. TypeError: integer argument expected, got float

Answer 1

If your values are already scaled to 0-255, try:

im.putpixel((x, y), tuple(int(c) for c in pixel))

If they're scaled 0-1, you just need to add a multiply:

im.putpixel((x, y), tuple(int(c*255.999 for c in pixel))

PS the preferred way of doing pixel level access is with the load function:

pix = im.load()
pix[x, y] = tuple(...)