在Python中将图像处理为深褐色色调

Question

我需要帮助来弄清楚如何将图像转换为深褐色。这是我目前所拥有的…但它只会将所有东西都改成黑色和白色，再加上一点点棕色。我不知道我做错了什么：（

import image

def convertSepia(input_image):
    grayscale_image = image.EmptyImage(input_image.getWidth(), input_image.getHeight())

    for col in range(input_image.getWidth()):
        for row in range(input_image.getHeight()):
            p = input_image.getPixel(col, row)

            R = p.getRed()
            G = p.getGreen()
            B = p.getBlue()

            newR = (R * 0.393 + G * 0.769 + B * 0.189)
            newG = (R * 0.349 + G * 0.686 + B * 0.168)
            newB = (R * 0.272 + G * 0.534 + B * 0.131)

            newpixel = image.Pixel(newR, newG, newB)
            grayscale_image.setPixel(col, row, newpixel)

    sepia_image = image.EmptyImage(input_image.getWidth(), input_image.getHeight())
    for col in range(input_image.getWidth()):
        for row in range(input_image.getHeight()):
            p = grayscale_image.getPixel(col, row)
            red = p.getRed()
            if red > 140:
                val = (R * 0.393 + G * 0.769 + B * 0.189)
            else:
                val = 0
            green = p.getGreen()
            if green > 140:
                val = (R * 0.349 + G * 0.686 + B * 0.168)
            else:
                val = 0
            blue = p.getBlue()
            if blue > 140:
                val = (R * 0.272 + G * 0.534 + B * 0.131)
            else:
                val = 0

            newpixel = image.Pixel(val, val, val)
            sepia_image.setPixel(col, row, newpixel)
    return sepia_image


win = image.ImageWin() img = image.Image("luther.jpg")

sepia_img = convertSepia(img) sepia_img.draw(win)

win.exitonclick()

还有什么建议可以从这里出发吗？谢谢：）

Answer 1

只需操纵像素值，就可以将图像转换为棕褐色。下面是代码（免责声明：摘自this文章。）

from PIL import Image

def sepia(image_path:str)->Image:
    img = Image.open(image_path)
    width, height = img.size

    pixels = img.load() # create the pixel map

    for py in range(height):
        for px in range(width):
            r, g, b = img.getpixel((px, py))

            tr = int(0.393 * r + 0.769 * g + 0.189 * b)
            tg = int(0.349 * r + 0.686 * g + 0.168 * b)
            tb = int(0.272 * r + 0.534 * g + 0.131 * b)

            if tr > 255:
                tr = 255

            if tg > 255:
                tg = 255

            if tb > 255:
                tb = 255

            pixels[px, py] = (tr,tg,tb)

    return img

原始图像

深褐色图像