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Safe colours for HDTV broadcast

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Jan VorkSafe colours for HDTV broadcast
by on Mar 21, 2013 at 9:26:14 am

Hi,

For 8bit PAL, RGB values from 16-235 are safe for broadcast.
Does anyone know these values for 16bit HD?

There are some standards:
ITU-R Recommendation BT.709-5
R103-2000

but both seem to live in the analog domain, talking about microvolts and ranges from -1% to 105%.

What I would like to have and spread is the digital safe values for 16bit (full range = 0 - 32768).

Thanks a lot!
Jan Vork
(Jaydude)

http://www.jaydude.nl


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Dave LaRondeRe: Safe colours for HDTV broadcast
by on Mar 21, 2013 at 3:35:04 pm

[Jan Vork] "For 8bit PAL, RGB values from 16-235 are safe for broadcast.
Does anyone know these values for 16bit HD?"


I've always multiplied the value by 256. Thus, 235*256=60160 and 16*256=4096.

Having said that, most editing applications automatically fix illegal video levels. How about color saturation? That's a different story, and you have to watch your step. If in doubt, you can always nest the comp in a temporary comp, then apply Color Finesse to the layer: you'll find a waveform monitor & vectorscope in it.

Dave LaRonde
Former Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Jan VorkRe: Safe colours for HDTV broadcast
by on Mar 21, 2013 at 4:01:35 pm

Thanks for your solution, Dave!

I was wondering if there are other values around. I can imagine that digital HD is somewhat more tolerant than analog PAL...

Found this clipping indicator solution:
http://joshuamosley.com/tutorials/AfterEffectsColorSafeHD/

It's for SD, but seems to work for HD as well.
Still not very satisfying. I want values to put in an Adjustmentlayer, or an AE-plug that works for HD.

What about AE's color settings? When I set my profile to 709, the output is visually less extreme, but the 'clipping indicator' still tells that the whites are illigal...

Why is this such a mystery?

http://www.jaydude.nl


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