Linear combination of color channels.
Computes a linear combination of channels of image X given a matrix
of coefficients M and optionally adding a constant value to
each output channel. X is an image of size [m, n, p, …],
M is a multiplication matrix of size [q, p] and C is a
vector of constants of length q. Y is a matrix of size
[m, n, q, …] with q output channels. q is in the range [1, p].
Y is of the same type as X, unless output_type is specified.
Package: image