[Python知识库][截屏]Python截屏深度解析

前言

上篇文章讲了python mss截屏，这一篇来讲讲各种方式的优劣(以最高画质)
本文测试均在Windows10x64上进行
分辨率2160x1440

介绍

先说，没用pyqt(没用过)和pywin32尽量支持全平台(win,linux,mac)

PIL.ImageGrab(win&mac)

应该大部分人用过或知道

from PIL import ImageGrab,Image
def grab_pil():
    im = ImageGrab.grab()
    im.save("pil.jpg",quality=95)

6倍清晰

pyautogui(win&linux&mac)

应该也有不少人知道，实际上pyautogui的screenshot是调用pyscreeze的

import pyautogui
def grab_pag():
    im = pyautogui.screenshot()
    im.save("pag.jpg",quality=95)

返回PIL.Image，6倍清晰

MSS·1 内存中转换PIL

def grab_mss_pil():
    with mss.mss() as m:
        im = m.grab(m.monitors[0])
        img = Image.new("RGB",im.size)
        img.frombytes(im.rgb)
        img.save("mss-pil.jpg",quality=95)

MSS·2 文件转换PIL

import os
def grab_mss_pil2():
    with mss.mss() as m:
        im = m.grab(m.monitors[0])
        mss.tools.to_png(im.rgb,im.size,6,"temp.png")
        img = Image.open("temp.png")
        img.save("mss-pil-2.jpg",quality=95)
        os.remove("temp.png")

MSS·3 内存转换Pygame

import pygame as pg
def grab_mss_pg():
    with mss.mss() as m:
        im = m.grab(m.monitors[0])
        s = pg.image.fromstring(im.rgb,im.size,"RGB")
        pg.image.save(s,"mss-pg.jpg")

对比

t = time.time()
grab_pil()
print("PIL",time.time() - t)

t = time.time()
grab_pag()
print("PAG",time.time() - t)

t = time.time()
grab_mss_pil()
print("MSS1",time.time() - t)

t = time.time()
grab_mss_pil2()
print("MSS2",time.time() - t)

pg.init()
t = time.time()
grab_mss_pg()
print("MSS->PG",time.time() - t)

结果

第一次
PIL 0.1140146255493164
PAG 0.09567046165466309
MSS1 0.1569356918334961
MSS2 0.47719478607177734
MSS->PG 0.5200934410095215

第二次
PIL 0.13492321968078613
PAG 0.10294556617736816
MSS1 0.14389920234680176
MSS2 0.940852165222168
MSS->PG 0.5586795806884766

第三次
PIL 0.10824346542358398
PAG 0.09102106094360352
MSS1 0.15020394325256348
MSS2 0.46080827713012695
MSS->PG 0.46437573432922363

结论

• 当运行东西少时pyautogui快(为什么)
• PIL很稳定在0.1s左右
• 内存MSS比较稳定,1.5s左右
• 文件MSS最慢且不稳定
• MSS转换pg慢，0.5s左右

神奇的是，mss.mss().shot()方法居然约0.2s，比转PIL还慢!

本文发于CSDN 于2021/12/25 19:24