Ha - this is interesting i don't know the answer but i do know a good
DP who hates RED for exactly it inability to retain highlights.
Neil Rögnvaldr Scholes
www.neilscholes.com
On 29/04/14 16:33, Schneider, Abraham wrote:
Thanks!
I assumed all this. Just wanted to make sure there is no mistake in doing one
specific way.
My main question is: is it true that RED cameras can only deliver/capture
highlights that are way darker then what the Alexa does? So in my example, a
maximum value of around 4 from the RED would be more than 3 stops less than the
Alexa with it's value of 54 (linear floating values measured in Nuke).
So the provocative question would be: is RED really that much worse than the
Alexa?
Abraham
Am 29.04.2014 um 17:10 schrieb Simon Björk:
Some info on Red footage an it's curves:
- Half Float Linear is the correct linear curve. The one that says Linear is
scaled/offset to be between 0-1.
- RedLogFilm is a Cineon curve. By applying a standard log2lin operation, the
result is identical to Half Float Linear.
- Both Half Float Linear and a linearized RedLogFilm will produce values below
zero. You can avoid this by converting to PLogLin instead, or just bring up the
values with a standard Add node.
- Rendering RedlogFilm or linear EXRs from RedCineX will produce identical
result as importing the R3D directly in Nuke.
- By rendering out an ACES file from RedCineX you will get a larger color
gammut, but you will not get any more information in the black/white point.
To sum up:
If the values are clipped when using Half Float Linear in Nuke, you will not
get any more information by applying different settings or going to a different
application.
Best regards,
Simon
2014-04-29 16:20 GMT+02:00 Schneider, Abraham <[email protected]>:
Hi there!
As we're more used to Alexa footage here, I just wanted to ask about RED, as I
have some footage here that let's me wonder about the capabilities of the RED
camera:
I have some shots with fire, sun, lamps, etc. in my images. Shot with EPIC-X.
When importing them into Nuke and linearizing them, I always see that these
bright highlights are clipping at around a value of 3 to 4 (depending on the
channel).
This happens, no matter how I treat the footage:
- importing the original R3D file in Nuke and use "half float linear" as gamma
space and 'linear' as the Read colorspace
- importing the original R3D file in Nuke and use "RedlogFilm" as gamma space
and 'cineon' (or PlogLin) as the Read colorspace
- converting the R3D in RedCine X Pro to DPX with RedlogFilm and importing with
'cineon' or 'PlogLin'
- converting the R3D in RedCine X Pro to EXR with ACES and importing with
'linear'
Having similar takes shot with the Alexa as AlexaLogC, bright highlights will
clip at a value of 54!
I don't want to start a 'war' Alexa vs. RED, but just wanted to know if this
really is 'normal', so the RED will not deliver higher values, or if there is
something wrong/strange is going on here.
Thanks for your help,
Abraham
Abraham Schneider
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