python图像处理

1、图片尺寸修改
from PIL import Image

def resizeImage(image_in, image_out):
    """
    修改jpg 图片尺寸到 200kb 左右
    """
    width = 1600
    img = Image.open(image_in)
    w, h = img.size
    # print(w, h)
    height = 1600 * h // w
    # print(height)
    out = img.resize((width, height), Image.ANTIALIAS)  # resize image with high-quality
    out.save(image_out)


def test1():
    import ocr
    rpa.win32.win_activate("金蝶")
    sleep(2)
    x1, y1 = rpa.win32.pos("应收单底部金额1_img")
    x2, y2 = rpa.win32.pos("应收单底部金额2_img")
    img_in = r"D:\img_in.png"
    img_out = r"D:\img_out.png"
    import pyautogui
    pyautogui.FAILSAFE = False
    pyautogui.screenshot(imageFilename=img_in, region=(x1, y1, int(x2) - int(x1), int(y2) - int(y1)))
    resizeImage(img_in, img_out)
    #默认aliyun ocr获取结果，access_key_id及access_key_secret替换成自己的
    text = ocr.text(img_out, app_code='129fe845778e40a69fdf84c09b601be8')
    

2、图片二值话，把有颜色的图片变成黑白图片

from PIL import  Image

def convert_Binary_image(filepath, newfilepath):
    # 自定义灰度界限，大于这个值为黑色，小于这个值为白色
    threshold = 200
    img = Image.open(filepath)
    # 灰度化
    img_gray = img.convert("L")
    img_binary = img_gray.point(lambda x: 0 if x < threshold else 255)
    img_binary.show()
    img_binary.save(newfilepath)
    return  img_binary

convert_Binary_image(r"D:\img_in.png", r"D:\imag_in.png")