照片转换素描图的python代码实现

from PIL import Image, ImageFilter, ImageOps

img = Image.open('/tmp/ruoyi.jpg')  


def Formula(a, b, alpha):

    return min(int(a*255/(256-b*alpha)), 255)

def ruoyi(img, blur=25, alpha=1.0):

    img1 = img.convert('L')      

    img2 = img1.copy()

    img2 = ImageOps.invert(img2)

    for i in range(blur):      

        img2 = img2.filter(ImageFilter.BLUR)

    width, height = img1.size

    for x in range(width):

        for y in range(height):

            a = img1.getpixel((x, y))

            b = img2.getpixel((x, y))

            img1.putpixel((x, y), Formula(a, b, alpha))

    img1.show()


ruoyi(img)