Brianc wrote:You're right (again) Cathy. I was getting mixed up with the terms. In fact the term we used was just "bars" (I never heard them referred to as "Academy bars"), These were used a lot as a general purpose test signal (hence my confusion with pulse cross). The line-up signal, of course, was sawtooth. - "Sawtooth and tone on OS1".
It's a mistake to assume that nearly everyone has gone down the flat panel path - I know plenty of ordinary people with CRT sets still; the occasional watchers of TV like myself who see absolutely no reason to buy one of these oversized, abysmal-sounding monstrosities.
Katie Bush wrote:Definitely second that (e)motion.....
Brianc wrote: In my broadcasting days, the transmitted signal had to be gamma corrected by stretching the blacks to compensate for the triode-like transfer characteristic of the CRT.
I totally agree, Cathy. The point that I was making when I brought up the question of gamma was that the linear stairstep Frank is generating would not indicate of how good or not the grey scale tracking is between dark and bright scenes because of the 2.5 gamma of the CRT. Were gamma correction be applied, then a light meter would be needed to measure the linearity of the brightness steps so a bit pointless, really!Cathovisor wrote:For test and diagnostic purposes, we want a linear signal as currently supplied from Frank's generator - a gamma corrected signal is completely unnecessary. Certainly all test signals I've ever encountered in broadcast are linear, except when a linear sawtooth/staircase is injected into the input of a camera head amp so you can observe the transfer characteristic when gamma correction is applied.
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