How do transparent background of png image in opencv?

8

yes, we can :}

>>> help(cv2.copyTo)
Help on built-in function copyTo:

copyTo(...)
    copyTo(src, mask[, dst]) -> dst
    .   @brief  This is an overloaded member function, provided for convenience (python)
    .   Copies the matrix to another one.
    .   When the operation mask is specified, if the Mat::create call shown above reallocates the matrix, the newly allocated matrix is initialized with all zeros before copying the data.
    .   @param src source matrix.
    .   @param dst Destination matrix. If it does not have a proper size or type before the operation, it is
    .   reallocated.
    .   @param mask Operation mask of the same size as \*this. Its non-zero elements indicate which matrix
    .   elements need to be copied. The mask has to be of type CV_8U and can have 1 or multiple channels.
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