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@sdkfz181tiger
Last active Oct 17, 2022
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Pillow基礎_06_画像のマスク
# coding: utf-8
"""
画像のマスク
"""
import numpy as np
from PIL import Image
# 例1
def sample01():
# Image
img_back = Image.open("./images/img_back.png")
img_front = Image.open("./images/img_front_black.png")
# Crop
img_bbox = img_front.getbbox()
img_crop = img_front.crop(img_bbox)
img_gray = img_crop.convert("L") # RGB -> L
arr_gray = img_gray.tobytes() # Image -> Bytes
arr_mono = [255 if b > 30 else 0 for b in arr_gray] # Gray -> Mono
img_mono = Image.frombytes(img_gray.mode, img_gray.size, bytes(arr_mono))
img_mono.save("img_crop_mono.png")
# Paste(L画像を使う場合)
img_back.paste(img_crop, box=(0, 0), mask=img_mono)
img_back.save("img_crop_black_dst.png")
sample01()
# 例2
def sample02():
# Image
img_back = Image.open("./images/img_back.png")
img_front = Image.open("./images/img_front_alpha.png")
# Crop
img_bbox = img_front.getbbox()
img_crop = img_front.crop(img_bbox)
img_crop.save("img_crop_crop.png")
# Paste(RGBA画像を使う場合)
img_back.paste(img_crop, box=(0, 0), mask=img_crop)
img_back.save("img_crop_alpha_dst.png")
sample02()
# 例3
def sample03():
# Image
img_back = Image.open("./images/img_back.png")
img_front = Image.open("./images/img_front_alpha.png")
# Composite
img_dst = Image.composite(img_back, img_front, mask=img_front)
img_dst.save("img_composite_dst.png")
sample03()
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