Discarding alpha channel from images stored as Numpy arrays

问题

I load images with numpy/scikit. I know that all images are 200x200 pixels.

When the images are loaded, I notice some have an alpha channel, and therefore have shape (200, 200, 4) instead of (200, 200, 3) which I expect.

Is there a way to delete that last value, discarding the alpha channel and get all images to a nice (200, 200, 3) shape?

回答1:

Just slice the array to get the first three entries of the last dimension:

image_without_alpha = image[:,:,:3]

来源：https://stackoverflow.com/questions/35902302/discarding-alpha-channel-from-images-stored-as-numpy-arrays