small nodes I've buidup as a workflow improvement. InvColor splitrgb2rgb splitrgb2scalar
none of them is really needed, but you will save a certain amount of nodes / space using them

rgb2rgb:
takes an incommig vector and split it to thre different vectors each having only one value filled
RGB outputs  R,0,0 / 0,G,0 / 0,0,B

rgb2scalar
takes an incomming vector and splits it into 3 different scalar outputs

InvColor:
takes an color and inverts its values (1.0,1,0,1.0 outputs 0.0,0.0,0.0) the second node output is same as first but clamps output values lower than 0.0 (wich would result in illegal color values)