how to get the number of channels from an image, in OpenCV 2?

Question

The answers at Can I determine the number of channels in cv::Mat Opencv answer this question for OpenCV 1: you use the Mat.channels() method of the image.

Answer 1

I'm kind of late but there is another simple way out there:

Use image.ndim Source, will give your right number of channels as below:

if image.ndim == 2:

    channels = 1 #single (grayscale)

if image.ndim == 3:

    channels = image.shape[-1]

Since a image is a nothing but a numpy array. Checkout OpenCV docs here: docs