Re: 10 point IRE question
Just a point of clarification (this is something I’m trying to get more people to understand)… the original post referred to “10 point IRE”… there is no such thing as IRE in digital video. IRE is an analog video concept that describes the relationship between input voltage and output level of each primary or the white level depending on the context. When we are dealing with digital video we cannot (and are not) dealing with IRE in any way. There are some old timers who refust to stop using it, and it even shows up in places where the software or hardware manufacturer should know better than to keep using IRE when it has a specific meaning that does not apply in the world of digital video. What we deal with in digital video is % white and digital levels 0-255 or 16-235.
I understand the original post was made at 3am and am not criticizing the original poster in ANY way – especially when IRE shows up in some of the software we use and even in the Lumagen Radiance processors (Jim P agreed that it should probably be changed but I’m sure it’s not very high on the priority list). The problem is that some day, someone may actually be referring to REAL IRE issues/questions and it will get all messed up if whoever he is communicating with thinks IRE and % white are the same thing. They MIGHT be the same thing, but not necessarily.