Possible missing "PA" check

[Yay295]

Pillow/src/PIL/PyAccess.py

Lines 59 to 62 in 5a087cc

	# Keep pointer to im object to prevent dereferencing.
	self._im = img.im
	if self._im.mode == "P":
	self._palette = img.palette

This code saves a reference to the image palette, but only for "P" mode images. I think it should probably check for "PA" here too. This saved palette is used later in this class, but again only for "P", not "PA".

Pillow/src/PIL/PyAccess.py

Lines 91 to 97 in 5a087cc

	if (
	self._im.mode == "P"
	and isinstance(color, (list, tuple))
	and len(color) in [3, 4]
	):
	# RGB or RGBA value for a P image
	color = self._palette.getcolor(color, self._img)

I haven't checked if this palette reference is used outside of this class, though it is supposed to be private so hopefully not.

[radarhere]

The code you're discussing was added in #3519 - "Allow RGB and RGBA values for P image putpixel". In code, what that allowed was

from PIL import Image
im = Image.new("P", (1, 1))
im.putpixel((0, 0), (255, 0, 0))

So you are requesting that this also work for PA.

from PIL import Image
im = Image.new("PA", (1, 1))
im.putpixel((0, 0), (255, 0, 0))

I've created PR #6504 for this.