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rec.709 vs rec.709 gamma 2.4 vs rec.709 gamma 2.2

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Laura Fernandez
rec.709 vs rec.709 gamma 2.4 vs rec.709 gamma 2.2
on Nov 18, 2016 at 8:30:23 am

Hello everybody.

Which is the difference between just REC.709 and REC.709 Gamma 2.4 and REC.709 Gamma 2.2 ???



thanks


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Joseph Owens
Re: rec.709 vs rec.709 gamma 2.4 vs rec.709 gamma 2.2
on Nov 18, 2016 at 6:09:31 pm

2.2 is the old standard which referenced phosphor CRT displays.

2.4 is the new standard which is now in widespread use.

jPo, CSI

"I always pass on free advice -- its never of any use to me" Oscar Wilde.


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Marc Wielage
Re: rec.709 vs rec.709 gamma 2.4 vs rec.709 gamma 2.2
on Nov 19, 2016 at 3:48:02 am

And then there's BT1886, which is a little bit of both. This is more complex question than you might think.

The thought behind BT1886 is pretty sound. I know of post houses around LA who are aligning the mid-tones and whites to 2.4, but the low-end to 2.2. Spectracal covers it pretty well:

http://www.spectracal.com/Documents/White%20Papers/BT.1886.pdf


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