Python OpenCV：如何将YCbCr转换回RGB？

Question

In OpenCV (Python), to convert RGB to YCbCr we use:

imgYCC = cv2.cvtColor(img, cv2.COLOR_BGR2YCR_CB)

What if i want to come back to RGB?

Answer 1

Check the docs for color conversions . You can see all of the available color conversion codes here: Conversion Color Codes .

For the colorspaces available, you can generally transform both ways--- COLOR_BGR2YCrCb (ie BGR-to-YCrCb) and COLOR_YCrCb2BGR (ie YCrCb-to-BGR). Also, OpenCV uses BGR ordering, not RGB ordering. Regardless, to answer the specific question at hand, simply convert back using the opposite order of the colorspaces:

img_bgr = cv2.cvtColor(imgYCC, cv2.COLOR_YCrCb2BGR)

Note: cv2.COLOR_YCrCb2BGR is equivalent to cv2.COLOR_YCR_CB2BGR , I just find the first variant easier to read. Since these transformations (on uint8 images especially), there's some rounding going on so you won't necessarily get the exact same image going back and fourth. But you shouldn't be more than like 1 off at a few of the locations.