When I use PIL.ImageGrab.grab() on my Windows 10 PC, I get exactly the RGB colors I expect. For example, (255, 0, 0) for red. On my Mac, PIL.ImageGrab.grab() returns a PIL.PngImagePlugin.PngImageFile which has unexpected RGBA values, e.g. (235, 50, 22, 255) for red. That converts, as expected with an A value of 255, to (235, 50, 22).
Can anyone explain how to get the true RGBA/RGB color values on a Mac?
My test program:
from pynput import mouse
from PIL import ImageGrab
class MouseHandler:
def on_mouse_click(self, x, y, button, pressed):
if pressed:
image_rgba = ImageGrab.grab()
image_rgb = image_rgba.convert('RGB')
print(f'{x, y} -> rgba={image_rgba.getpixel((x, y))} rgb={image_rgb.getpixel((x, y))}')
if __name__ == "__main__":
handler = MouseHandler();
with mouse.Listener(on_click=handler.on_mouse_click) as ml:
ml.join()
My test color source: the red and blue blocks on https://www.w3schools.com/html/html_colors_rgb.asp
My test program's output on my Mac, clicking on the red block, then the blue block:
(1234.27734375, 782.59765625) -> rgba=(235, 50, 22, 255) rgb=(235, 50, 22)
(1752.3125, 796.7890625) -> rgba=(28, 0, 255, 255) rgb=(28, 0, 255)
I was expecting (255, 0, 0) and (0, 0, 255).
I'm running this test on a 2021 MacBook Pro running MacOS 13.4.1, with Python 3.11 and Pillow 10.0.0.
(P.S., I've also tried using mss, and get the same results.)
