Either way the r3d reader set to linear will clamp at 1.0, set to half linear float will go beyond 1.0. I don't pretend to know what the red sdk is doing under the hood. Half linear float option does not exist under redcinex.
-deke On Tue, Dec 20, 2011 at 13:45, Randy Little <[email protected]> wrote: > clamped to 1.0 or raw data mapped to values between 0-1.0 with 3 > places of precision. But I am pretty sure the d/a in every camera is > integer and mapping data into integer space for its raw file. > http://www.rslittle.com > > > > > On Tue, Dec 20, 2011 at 13:37, Howard Jones <[email protected]> > wrote: > > 1.0 is half float/float even if not clamped ;) > > for Ron's question (if I read it right) > > > > Half float or 16 bit float is a less accurate version of 32 bit float. > > AFAIK The float being the floating point part of the number. you dont > save > > 123.45678 you save 12345678 with a bit(?) for the position of the > floating > > point. > > The difference between 16bit (half float) and 32 bit (float) is that with > > 16bit the length of that number gets truncated at a lesser degree of > > accuracy compared to 32bit. > > You could have 10 or 8bit float if you wanted, just not much point for > what > > we do. Similarly you could have 32bit non-float if you really wanted, but > > again no point in our game afaic - as far as I care ;) > > > > Linear is linear, but again you could put any gamma or other curve in > there > > if you wanted. > > > > http://en.wikipedia.org/wiki/Half-precision_floating-point_format > > > > Howard > > > > ________________________________ > > From: "[email protected]" <[email protected]> > > > > To: Nuke user discussion <[email protected]> > > Sent: Tuesday, 20 December 2011, 20:24 > > Subject: Re: [Nuke-users] Redcine-X VS Nuke > > > > 1.0 is half float if it encoded half float and clamp to 1.0 > > > > Sent from myTouch 4G > > > > ----- Reply message ----- > > From: "Deke Kincaid" <[email protected]> > > To: "Nuke user discussion" <[email protected]> > > Subject: [Nuke-users] Redcine-X VS Nuke > > Date: Tue, Dec 20, 2011 12:13 > > > > > > Last I knew RedcineX only outputs EXR to "linear" which caps out at 1.0, > not > > half linear float. > > > > -deke > > > > On Tue, Dec 20, 2011 at 04:29, Simon Björk <[email protected]> > wrote: > > > > I might be misunderstanding you, but why the srgb2lin conversion? > RedcineX > > only outputs linear exrs so as far as I know you shouldn't use any > > colorspace convertions in Nuke if you chose that path. You can test this > if > > you try different gamma curves in RedcineX and render to EXR. They should > > all look identical. > > > > Regarding my earlier post about half float linear gamma setting in Nuke > > should match a rendered exr from RedcineX, I just tested this and it > doesn't > > seem to work. I'm pretty sure this worked earlier, but I might be wrong. > The > > "linear gamma curve" in Nukes R3D importer is an old one and shouldn't be > > used. Not sure why it's still there. > > > > This whole R3D in other applications often causes problems. Same in After > > Effects. I find that the most reliable solution (still unreliable) is to > > output from RedcineX. > > > > /Simon > > > > > > > > 2011/12/20 Deke Kincaid <[email protected]> > > > > I forgot to mention that It all depends what file format your > outputting. If > > your outputting to dpx or tiff then set the decode colorspace/gamma curve > > the same as RedcineX but in the write node set the colorspace to > "linear". > > While working with the R3d though, the viewer will look different from > > RedcineX unless you set it to linear. After reading back in the > dpx/tiff, > > then you can set the viewer back to srgb and it will look correct. > > > > If your outputting to Exr from RedcineX then you need add a colorspace > node > > with in:sRGB and out:Linear (Read node settings all should match > RedcineX). > > While this is technically incorrect but it will give you the equivalent > of > > burning the grade into the EXR. > > > > People here are mentioning using Half Linear Float which does properly > > linearize the curve form the chip when going to EXR. You would need to > > extract a lut between the linear R3d and your director's color to use as > a > > viewer lut and use that in the write node. > > > > -deke > > > > > > On Tue, Dec 20, 2011 at 00:15, Ron Ganbar <[email protected]> wrote: > > > > Thanks for this Deke. > > The settings are all the same, but looking at the Nuke Viewer set to > sRGB, I > > see a very washed out image - what I would normally consider a Cineon > > looking image. Looking at the Redcine-X viewer it looks correct. > > Any ideas? > > > > > > Ron Ganbar > > email: [email protected] > > tel: +44 (0)7968 007 309 [UK] > > +972 (0)54 255 9765 [Israel] > > url: http://ronganbar.wordpress.com/ > > > > > > > > On 20 December 2011 09:48, Deke Kincaid <[email protected]> wrote: > > > > First, try hitting the "Metadata" button in the read node. That should > make > > it grab the right color settings. If not you can match the same settings > in > > Nuke as the one he has in RedcineX (they should all be named the same). > > > > Also make sure your using Nuke 6.3v5 because it includes RedGamma2 and > > RedColor2 which is missing from versions before that (older SDK). > > > > -deke > > > > On Mon, Dec 19, 2011 at 23:34, Ron Ganbar <[email protected]> wrote: > > > > Hi all, > > I don't have a lot of experience with converting R3D files, but I so far > did > > it with Nuke and was pretty happy with the result. > > However, a director, who is technically minded, just told me that when he > > takes something into Redcine-X and without changing the color at all he > gets > > something he likes. I did the same thing, and indeed the image looks > nice. > > When I do the same thing in Nuke I get a very washed image. What's the > > output colorspace of the Nuke R3D read node? How can I get the same kind > of > > output from Nuke's Read node to Redcine-X's output? > > > > Thanks, > > Ron Ganbar > > email: [email protected] > > tel: +44 (0)7968 007 309 [UK] > > +972 (0)54 255 9765 [Israel] > > url: http://ronganbar.wordpress.com/ > > > > > > _______________________________________________ > > 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 > > > > > > > > > > -- > > -------------------------------- > > Stiller Studios > > Lidingö/Sweden > > > > Simon Björk > > Stiller Studios > > +46 (0)8 555 23 560 > > Ekholmsnäsvägen 40, S-181 41 Lidingö > > [email protected] > > www.stillerstudios.se > > > > find us: > > > http://www.eniro.se/query?search_word=stiller+studios&geo_area=liding%F6&what=all > > > > > > > > _______________________________________________ > > 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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