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[14:41:52] <bencc1> I'm trying to subtract an image from background with numpy and save back to image and getting an error

[14:41:54] <bencc1> ValueError: operands could not be broadcast together with shapes (1,512,512,3) (512,512)

[14:42:10] <bencc1> what does (1,512,512,3) means?

[14:42:18] <bencc1> and how can I save it?

[14:42:27] <bencc1> Image.fromarray((((img - matte) * 255).astype('uint8')), mode='L').save('full.jpg')