Hello - I need to make separation negatives from a 4x5 color transparency with my enlarger. I took the transparency to a pro lab, and asked them to measure the density range. I was given three numbers: r=1.84, g=1.99 and b=1.77. The exposure scale of the "paper" the negatives will be printed on is 1.65. Does this mean I need to make three masks, one for each negative so that each one fits the exposure scale of the paper? I've never done this before, but this is what seems to make sense. This is for a color assembly printing process, but if I were doing RA-4, which of the three density ranges would be the mask be made for? Thanks in advance. Eric.