Ok, I registered it perfectly, FINALLY. The original image used consisted of horizontal blocks or Red, Green, Blue, purple and yellow, with black lines in between.
The well-reproduced image shows very good red, excellent blue and good yellow and purple. The green, however, is a bit light. In order to keep the screen neutral grey, I had to reduce the saturation of the green slightly. This results in a sligtly light green on the viewed image.
Also, the film's emulsion side and the mask's printed side must face each other; if they don't the space in between causes the colors to vary according to viewing angle.
I was able to nab a shot with a digit@l camera, and I'll upload it here later on today; the computer with the camera drivers is out of commission, and the drivers CD has gone to places unknown ...