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: "randyslit...@gmail.com" <randyslit...@gmail.com>
>To: Nuke user discussion <nuke-users@support.thefoundry.co.uk>
>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" <dekekinc...@gmail.com>
>To: "Nuke user discussion" <nuke-users@support.thefoundry.co.uk>
>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 <si...@stillerstudios.se> 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 <dekekinc...@gmail.com>
>>
>>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 <ron...@gmail.com> 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: ron...@gmail.com
>>>>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 <dekekinc...@gmail.com> 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 <ron...@gmail.com> 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: ron...@gmail.com
>>>>>>tel: +44 (0)7968 007 309 [UK]
>>>>>> +972 (0)54 255 9765 [Israel]
>>>>>>url: http://ronganbar.wordpress.com/
>>>>>>
>>>>>>_______________________________________________
>>>>>>Nuke-users mailing list
>>>>>>Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/
>>>>>>http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>>>>>>
>>>>>
>>>>>_______________________________________________
>>>>>Nuke-users mailing list
>>>>>Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/
>>>>>http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>>>>>
>>>>
>>>>_______________________________________________
>>>>Nuke-users mailing list
>>>>Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/
>>>>http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>>>>
>>>
>>>_______________________________________________
>>>Nuke-users mailing list
>>>Nuke-users@support.thefoundry.co.uk, 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
>>si...@stillerstudios.se
>>www.stillerstudios.se
>>
>>find us:
>>http://www.eniro.se/query?search_word=stiller+studios&geo_area=liding%F6&what=all
>>
>>
>>
>>_______________________________________________
>>Nuke-users mailing list
>>Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/
>>http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>>
>
>_______________________________________________
>Nuke-users mailing list
>Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/
>http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>
>
_______________________________________________
Nuke-users mailing list
Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/
http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
