另一個基于@user2667409答案的解決方案，
它使用每個元素1位來表示掩碼，并将最終結果導出為JPEG格式。import numpy
from PIL import Image, ImageDraw
# read image as RGB (without alpha)
img = Image.open("crop.jpg").convert("RGB")
# convert to numpy (for convenience)
img_array = numpy.asarray(img)
# create mask
polygon = [(444,203),(623,243),(691,177),(581,26),(482,42)]
# create new image ("1-bit pixels, black and white", (width, height), "default color")
mask_img = Image.new('1', (img_array.shape[1], img_array.shape[0]), 0)
ImageDraw.Draw(mask_img).polygon(polygon, outline=1, fill=1)
mask = numpy.array(mask_img)
# assemble new image (uint8: 0-255)
new_img_array = numpy.empty(img_array.shape, dtype='uint8')
# copy color values (RGB)
new_img_array[:,:,:3] = img_array[:,:,:3]
# filtering image by mask
new_img_array[:,:,0] = new_img_array[:,:,0] * mask
new_img_array[:,:,1] = new_img_array[:,:,1] * mask
new_img_array[:,:,2] = new_img_array[:,:,2] * mask
# back to Image from numpy
newIm = Image.fromarray(new_img_array, "RGB")
newIm.save("out.jpg")