Mark Shubin wrote: > And how do you ensure that the multiple mixers track perfectly, so > hue > and saturation don't change in mid-dissolve? I suppose general analog good practices apply, with periodic injection of calibration signals and adjustment of potentiometers. Peter mentions some nightmarish procedures to that effect so at least they seem to have existed. I would suggest inserting amplitude-calibrated pulses in the color components at the beginning of the processing chain and using them at the end to correct any imbalance that might have occurred on the way, before removing them. After a color correction step, the calibrated pulses would have to be re-inserted, as their ratio would be modified. Possibly automatic correction could have been performed based on those pulses. ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.