colorm.go
func (c *ColorM) Concat(other ColorM) {
	c.impl = c.impl.Concat(other.impl)
}
func (c *ColorM) Concat(other ColorM) {
	c.impl = c.impl.Concat(other.impl)
}
func ( c * ColorM ) Concat ( other ColorM ) { c . impl = c . impl . Concat ( other . impl ) }
// Concat multiplies a color matrix with the other color matrix.
// This is same as muptiplying the matrix other and the matrix c in this order.
Concat multiplies a color matrix with the other color matrix . This is same as muptiplying the matrix other and the matrix c in this order .