The HDK docs should explain the format of the prelut:
http://www.sidefx.com/docs/hdk11.0/hdk_io_lut.html
Additionally, OCIO's FileFormatHDL.cpp might be of use to clarify some
things. It is quite heavily commented, and has some test cases at the
end of the file which contain small example LUT's:
https://github.com/imageworks/OpenColorIO/blob/master/src/core/FileFormatHDL.cpp
On 27/06/13 13:42, Dan Rosen wrote:
I don't have an OCIO environment set up. So I'd like to feed in a custom
shaper lut file or simply copy and paste it in. Is there a command line
way to feed a shaper lut file vs setting it in an OCIO environment? I
don't think there is. I"ll send an example of what I've got tomorrow as
I'm not currently in the office. It's just a matter of format in the
shaper lut values.
I'm sure it would benefit me in the log run to set up the OCIO
environment. One small thing is that we have a custom lin2log at our
facility. Do you have a generic Houdini lut, with a lin2log in the pre
lut, that you could share so I could look at the formatting?
Thanks,
Dan
On Wednesday, June 26, 2013, Alex - wrote:
What sort of problem are you having?
We have been using ociobakelut to create houdini.lut files with
working 1D shapers/preluts without any issues.
Your example looks pretty correct.
On Thu, Jun 27, 2013 at 8:57 AM, Dan Rosen <[email protected]
<javascript:_e({}, 'cvml', '[email protected]');>> wrote:
Hello there,
I'm looking for some help to generate Houdini linear LUTs. We
are using ociobakelut a bit and can convert luts to Houdini
format, but the header, specifically the log2lin Pre (LUT) is
proving difficult. If anyone has any insight and or python that
might be useful to share that would be much appreciated.
I know that the header is something like this, but with the
format of the Pre (LUT) part is where I'm getting tripped up.
Version 3
Format any
Type 3D+1D
> From 0 10
To 0 1
Black 0
White 1
Length [cube_size] [prelut_size]
LUT:
Pre {
[val]
[val]
:
[val]
}
3D {
[r] [g] [b
<http://www.sidefx.com/docs/hdk10.0/_r_e___o_g_l_8h.html#0f71581a41fd2264c8944126dabbd010>]
[r] [g] [b
<http://www.sidefx.com/docs/hdk10.0/_r_e___o_g_l_8h.html#0f71581a41fd2264c8944126dabbd010>]
:
[r] [g] [b
<http://www.sidefx.com/docs/hdk10.0/_r_e___o_g_l_8h.html#0f71581a41fd2264c8944126dabbd010>]
}
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rising sun pictures | www.rsp.com.au
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