What does this filter do? I've tried out and it stays the same, and
some filter become unavailable.
could someone please tell me?
> thank you
>> What does this filter do? I've tried out and it stays the same, and
>> some filter become unavailable.
>> could someone please tell me?
>> thank you
> NTSC Colors modifies any vivid reds and blues in an RGB or Lab image
>so those colors don't bleed into others when it's transferred to video.
>I believe it's technically against the law to transmit certain colors
>over the air, though I doubt the FCC would come to arrest you down if
It's not really color that is the issue per se, but rather its *brightness*
level. Luminance levels in NTSC are measured in IRE (Institute of Radio
Engineers) levels, which basically represents the voltage level of the signal.
For various boring and arcane technical reasons, a "legal" NTSC signal
(translated, "a video signal that makes TV broadcasters and high-priced
equipment happy) cannot exceed 100 IRE without making certain broadcasting
equipment complain or go haywire.
Basically, its similar to a color gamut in print. So if you create graphics for
broadcast, you shouldnt use highly saturated colors, such as a "255, 255, 255"
white or yellow. Not only can there be problems with exceeding 100 IRE, but the
edges of certain color combinations/saturations can "shimmer" like mad (known as
"dot crawl") on TV.
If you have ever seen a cheap commercial for a used-car dealership where the
audio "buzzes" whenever a title or graphic appears on screen, this is usually
indicative of "illegal" video levels, which ends up interfering with the audio
I suppose that it /may/ actually be illegal to broadcast these colors, but the
FCC doesnt bother enforcing it these days, what with the ubiquity of cable
television, which i would guess is far less problematic now than back when TV
came to your house as-God-intended-it-to-be, i.e. through the airwaves.
___________________________________________________________________________Quote:> I've never put this filter to use (and probably never will), but
>it's pretty lame, from what I've heard. If you modify your image after
>running this filter, you could very well have to run it again if the
>colors have been affected.
> It's not even a real filter, for that matter. It should probably be
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