You're suggesting 'RedlogFilm' in the RED settings, right? Doing this and using a separate colorspace to do the Log2Lin gives similar values than using the Read colorspace. My maximum value in the image is lower than 5 compared to the > 54 with an Alexa image.
Am 29.04.2014 um 18:17 schrieb Randy Little: > 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 > _______________________________________________ > 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
