opencv-python的格式转换 RGB与BGR互转

opencv读取图片的默认像素排列是BGR，和很多其他软件不一致，需要转换。

opencv rgb转bgr 或  bgr转rgb

rgb = (cv_img * 255).astype(np.uint8)
bgr = cv2.cvtColor(rgb, cv2.COLOR_RGB2BGR) 
#cv2.COLOR_RGB2BGR rgb转bgr
#cv2.COLOR_BGR2RGB bgr转rgb
cv2.imwrite(sub_path + '/' + str(step) + '.jpg', bgr)

BGR to RGB

OpenCV image to Matplotlib

rgb = bgr[...,::-1]

RGB to BGR

Matplotlib image to OpenCV

bgr = rgb[...,::-1]

RGB to GBR

gbr = rgb[...,[2,0,1]]