import os
import numpy as np
import cv2 as cv

def main():
    # 画像を読み込む
    directory = os.path.dirname(__file__)
    image = cv.imread(os.path.join(directory, "image.jpg"))
    if image is None:
        exit()

    # マトリックス風カラー変換
    # https://twitter.com/iquilezles/status/1440847977560494084
    image = image.astype(np.float32) / 255.0
    image = image ** (3.0 / 2.0, 4.0 / 5.0, 3.0 / 2.0)
    image = (image * 255.0).astype(np.uint8)

    # 画像を表示する
    cv.imshow("matrix color", image)
    cv.waitKey(0)
    cv.destroyAllWindows()

if __name__ == '__main__':
    main()