CompuServe Thread

#Addendum: Luma/Chroma

2 messages in this thread
#111614From: Nicholas A. PatrinMay 21, 1995 6:37 PM
Chuck, after posting my prior note regarding luma level, chroma level and phase problems, I did the following: In Flyer: loaded the ColorBars file into the Proj window and played it: the amplitudes are a bit better than in the clip I had recorded, but the phase shift is still about 8 degrees CCW from spec. Quit Flyer, went into Old Toaster: Original Toaster color bars are a LOT closer to target phase. Net: the Flyer outputs colors that are shifted about 8 degrees from spec, for both the ColorBars file and the clip I recorded. There is about an 8-9 IRE loss in recorded luma amplitudes (grey, white). Is AutoCalibrate supposed to deal with such shortfalls? Why is it hanging up? (4.03, Original Toaster, A2000, 25MHz accelerator). Regards………..Nick
#111678From: Wayne ColeMay 22, 1995 2:21 AM
Nick, I have a set-up very similar to yours. I have A2000. T2000. GVP COmob '030 33 mhz accel. First, do the aircap adjustment on the T2000 to get the ERR1 voltage to -2.1. With that set-up I've been able to get my bars tape to match the Flyer bars to the point where its almost impossible to tell where the line in the "split screen" is when I do a half-TBar on the vertical single blind (or whatever it is called). Now, I do use a Y/C transcoding TBC both in and out of hte Flyer. If you like, I can hook the Toaster/Flyer direct to the WF/VS and see if I see the same level and phase shifts you are getting. wmc – via Autopilot!