Digital BW, The Print

Hello!

I am preparing workflow for QTR ink partitioning and linearization 
using X-Rite Pulse spectro. Main problem was to write a program that 
reads strips without color headers and TIDs -- I don't have color inks 
in my printer. I prepared strip targets with 21 and 51 patches that I 
could read in one or two sweeps, instead of doing spot measurements. 
This program then could insert measured L data right to QTR 
linearization table, saving a lot of time.
Next step is to modify ink separation image and convert it to series of 
strips compatible with Pulse. I cannot figure out, how to add patches 
to that image that will be printed 50% gray, is it possible?

Thanks,
Sergei