Change specific RGB color pixels to another color, in image file

Question

I would like to change a single color with Python.

If a fast solution with PIL exists, I would prefer this solution.

At the moment, I use

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Answer 1

This solution uses glob to edit all pngs in a folder, removing a color and swapping it out with another, but uses RGBA.

import glob
from PIL import Image

old_color = 255, 0, 255, 255
new_color = 0, 0, 0, 0

for path in glob.glob("*.png"):
    if "__out" in path:
        print "skipping on", path
        continue

    print "working on", path

    im = Image.open(path)
    im = im.convert("RGBA")
    width, height = im.size
    colortuples = im.getcolors()

    pix = im.load()
    for x in xrange(0, width):
        for y in xrange(0, height):
            if pix[x,y] == old_color:
                im.putpixel((x, y), new_color)

    im.save(path+"__out.png")

It's a modification of https://stackoverflow.com/a/6483549/541208