concat method
Implementation
void concat(ColorTransform second) {
multipliers[0] = multipliers[0] * second.multipliers[0];
multipliers[1] = multipliers[1] * second.multipliers[1];
multipliers[2] = multipliers[2] * second.multipliers[2];
multipliers[3] = multipliers[3] * second.multipliers[3];
offsets[0] = offsets[0] + second.offsets[0];
offsets[1] = offsets[1] + second.offsets[1];
offsets[2] = offsets[2] + second.offsets[2];
offsets[3] = offsets[3] + second.offsets[3];
}