I'm guessing Tahl doesn't have the spi-vfx config set in the project's
lut settings?!
If that is set to nuke-default you get the values he posted.
On 10/9/12 12:11 PM, Schneider, Abraham wrote:
Doing exactly what you propose, I'll get a perfect 0.18 for the 445
swatch when using the OCIO LogConvert node and 0.17965 when using OCIO
colorspace with in set to 'lg10' and out set to 'lnf'. Same behaviour
as the normal (not OCIO) Ploglin node.
Maybe you have something setup wrong?
Here my testscript. The constant is the picked color of the Marcie 445
swatch:
#!
/Applications/Nuke6.3v8/NukeX6.3v8.app/../Nuke6.3v8.app/Contents/MacOS/Nuke6.3v8
-nx
Root {
inputs 0
name /Users/abraham/Desktop/ocio_test.nk
first_frame 0
lock_range true
format "2048 1556 0 0 2048 1556 1 2K_Super_35(full-ap)"
proxy_type scale
proxy_format "1024 778 0 0 1024 778 1 1K_Super_35(full-ap)"
luts {linear {}
sRGB {}
rec709 {}
Cineon {}
Gamma1.8 {}
Gamma2.2 {}
Panalog {}
REDLog {}
ViperLog {}
AlexaV3LogC {}
PLogLin {}
SLog {}
REDSpace {}
AlexaV2LogC {"((t > 0.1312920 ? (pow(10.0, (t - 0.3910068) /
0.2471896) + 0.6229143) / 182.20240 : (t + 0.5651548) / 178.2469)
- 0.003907204) * 36 "}}
defaultViewerLUT "OCIO LUTs"
OCIO_config spi-vfx
}
Constant {
inputs 0
channels rgb
color {0.4349952638 0.4349952638 0.4349952638 0}
name Constant1
xpos 173
ypos -142
}
set N16427a60 [stack 0]
OCIOColorSpace {
in_colorspace {{4} ln/lnf ln/lnh ln/ln16 lg/lg16 lg/lg10 lg/lgf
gn/gn10 vd/vd16 vd/vd10 vd/vd8 hd/hd10 dt/dt16 cp/cpf nc/nc8
nc/nc10 nc/nc16 nc/ncf srgb/srgb8 p3dci/p3dci8}
name OCIOColorSpace1
xpos 173
ypos -11
}
push $N16427a60
PLogLin {
name PLogLin1
xpos 293
ypos -9
}
push $N16427a60
OCIOLogConvert {
name OCIOLogConvert1
xpos 55
ypos -8
}
Viewer {
frame_increment 8
viewerProcess "Raw (sRGB)"
input_process false
name Viewer1
xpos 179
ypos 58
}
Read {
inputs 0
file "/Users/abraham/Dropbox/Vortrag Nuernberg/marcie_log.dpx"
format "1024 778 0 0 1024 778 1 1K_Super_35(full-ap)"
origset true
colorspace linear
raw true
timecode 00:00:00:00
name Read1
xpos -20
ypos -152
}
Am 09.10.2012 um 00:47 schrieb Tahl Niran:
Hoping someone who has some experience with OCIO, espeically at Sony,
can clarify this for me. I have been taking a look at the Sony OCIO
docs and it all seems pretty clear, I notice that in spi-vfx they
are equating 445 (lg10 value) with 0.18 (inf, inh value) which is
great and I like.
What I want to know is, are Sony pre-treating any of the the Film Log
files (for example lg10) or using some specific scanning correction
not common to the rest of us ? If I just take a nominal dpx log file
for example, Marcie. Read that in as Raw Data, then apply an OCIO Log
Convert. Then her 445 swatch is not returning a..... 18 more like
.1493. Same if I use an OCIO to Colorspace
or have I missed something ?
*Abraham Schneider*
Head of VFX pipeline / VFX Supervisor
ARRI Film & TV Services GmbH
Tuerkenstr. 89
D-80799 Muenchen / Germany
Phone +49 89 3809-1269
EMail [email protected]
www.arri.de/filmtv
<http://www.facebook.com/pages/ARRI-FIlm-TV/117731121606986?ref=sgm> Click
here
<http://www.facebook.com/pages/ARRI-FIlm-TV/117731121606986?ref=sgm>
to visit us on Facebook!
-----------------------
Tahl Niran
www.tahlniran.com <http://www.tahlniran.com>
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