什么是色调？

色调，在画面上表现思想、感情所使用的色彩和色彩的浓淡。分为暖色调和冷色调。

from cv2 import destroyAllWindows, imread, imshow, waitKey#创建棕褐色色调
def make_sepia(img, factor: int):pixel_h, pixel_v = img.shape[0], img.shape[1]#创建像素的灰度表示def to_grayscale(blue, green, red):  return 0.2126 * red + 0.587 * green + 0.114 * blue#规范化 R/G/B 值，如果值> 255，则返回 255def normalize(value):return min(value, 255)for i in range(pixel_h):for j in range(pixel_v):greyscale = int(to_grayscale(*img[i][j]))img[i][j] = [normalize(greyscale),normalize(greyscale + factor),normalize(greyscale + 2 * factor),]return imgif __name__ == "__main__":#读取原始图像images = {percentage: imread("image_data/test.jpg", 1) for percentage in (10, 20, 30, 40)}for percentage, img in images.items():make_sepia(img, percentage)for percentage, img in images.items():imshow(f"Original image with sepia (factor: {percentage})", img)waitKey(0)destroyAllWindows()

图像处理前：

图像处理后：