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the depth indicate to count of channel of image (3 = RGB, 1 = Gray) and the type indicate to type of each pixel of image. for example for derivatives of image you need 16bit instead of 8bit.

the The depth indicate to count of channel of image (3 = RGB, 1 = Gray) and the type indicate to type of each pixel of image. for example for derivatives of image you need 16bit instead of 8bit.8bit. The channel indicate to count of channel of image (3 = RGB, 1 = Gray)