NTSC Limits
Wayne,
<<Well, yes and no.>>
PMFJI, but I wanted to thank you for writing in such detail about this
subject. I've attempted to understand the relationship between the primary
colors so my graqhics won't be too hot, but it's so confusing. Your help is
greatly appreciated!
I have two (2) questions.
1. If one doesn't have a WF monitor is there a formula to determine when a
color is too hot?
2. My biggest problems come when the background image in CG or the backdrop
image in LW is too hot. How do I reduce the chroma/luma on backdrop images?
Example: Right now I'm working on a series of CG pages. I've seen to it
(partly thanks to your comments here), that the color values of all the fonts
and graphic elements are below 100 ire on my WF montitor. But, my background,
which is a still shot of black draping with jewelry, is at nearly 110 ire
(actually it's the jewerly in the shot that is so hot). Short of running this
image through, say ImageFX to reduce the signal, is there a way to do this in
the Toaster?
Oh, and another thing I've been meaning to ask you concerns the Toaster's
output. I send NTSC colorbars, from my Grass Valley sync/color bar generator to
my Sony monitors and Leader WF/Vectorscopes for recalibrating. Once everything
is set and on the proper marks I send the colorbars the Toaster itself
generates. When I do this the WF readout drops about 5 ire, and all the
vectorscope readings drop out of the RGB boxs slightly. The luma stays where it
is. Just the chroma moves.
Why? Is this normal for the Toaster, or is my board in need of repair? I can
bring the vectorscope marks back into their boxes with the Gain knob. Is this
advisable, or necessary?
Thanks again for all this free info. I think this would make an excellent, and
useful article. Based on the number of responses in this forum to this thread,
I'd say I'm not the only person that's perplexed by colors that run to hot for
NTSC.
Take care,
Michael,CyberGrafx.3D