import numpy as np
import cv2 as cv
#glay画像を読み込む
src = cv.imread("./30-a-1.jpg", 0)
# 変換
src_RGB = cv.cvtColor(src, cv.COLOR_GRAY2BGR)
cv.imwrite('./30-a-1_RGB.jpg',src_RGB)

#cv2 .imshow("input", src)
#cv2 .imshow("output", src_RGB)
#cv2 .waitKey(0)
#cv2 .destroyAllWindows()