What happens if you do pdlog in red settings and then use a colorspace node to do loglin. Read node loglin does weird things. Colorspace node seems to work better. On Apr 29, 2014 11:43 AM, "Neil Rögnvaldr Scholes" <[email protected]> wrote:
> 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 >>> Head of VFX pipeline / VFX Supervisor >>> >>> >>> Türkenstr. 89, 80799 München / >>> Phone +49 89 3809-1096 >>> >>> EMail [email protected] >>> >>> Visit us on Facebook!________________________________ >>> >>> >>> ARRI Film & TV Services GmbH >>> Sitz: München Registergericht: Amtsgericht München >>> Handelsregisternummer: HRB 69396 >>> Geschäftsführer: Helge Jürgens, Josef Reidinger >>> _______________________________________________ >>> Nuke-users mailing list >>> [email protected], http://forums.thefoundry.co.uk/ >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> >>> _______________________________________________ >>> Nuke-users mailing list >>> [email protected], http://forums.thefoundry.co.uk/ >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> >> >> > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >
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