python 3.x - How can I take out an object from an image to remove the background?

Question

I have a uint8 image and a mask of it (float32).

The mask has ones where the object I want to keep is, and zeros for the background.

I want to make a new image that shows the real colored object instead of the ones, and keep the background zeros.

I tried to multiply both images but it says that the mask has 3 dimensions and the colored image 4 dimensions.

question from:https://stackoverflow.com/questions/65875845/how-can-i-take-out-an-object-from-an-image-to-remove-the-background