func (c *ColorM) SetElement(i, j int, element float64) {
	c.impl = c.impl.SetElement(i, j, float32(element))
}
func (c *ColorM) SetElement(i, j int, element float64) {
	c.impl = c.impl.SetElement(i, j, float32(element))
}
func ( c * ColorM ) SetElement ( i , j int , element float64 ) { c . impl = c . impl . SetElement ( i , j , float32 ( element ) ) }
// SetElement sets an element at (i, j).
SetElement sets an element at ( i j ) .