linear to log space

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  • #201468
    Dubiduu
    Participant

    Hi all,

    This is my first time working in lin-log workflow.
    Im working on full CG movie, 3D guys send the render result in gamma 1.0.

    Im using cinespace to profile my monitor.
    After profiling, I create the LUT to apply in Toxik.
    Do I have to apply the LUT everytime I create a new comp? or is there any automatic way?

    After compositing, I have to export to DPX Cineon. Should I apply ‘log’ tool or not?

    I really appreciate if there’s any explanation about this workflow (gamma, linear, log things). It’s quite confusing though…

    Thanks alot.

    Leo

    #215022
    Tobin
    Participant

    sorry, i can´t help you in toxik, but there is a nice tutorial for combustion regarding this topic:

    http://www.creativecow.net/show.php?page=/articles/bell_alan/bit_depth/index.html

    maybe this is helpful,

    timor

    #215025
    Tanner Wickware
    Participant
    Dubiduu wrote:
    Do I have to apply the LUT everytime I create a new comp? or is there any automatic way?

    If I understand correctly what you are trying to achieve, what you should do is to have the LUT tool used as a “display modifier” in your Player view. Drag the LUT tool from the East gate, go over the Player, open the Gate UI by pressing the middle mouse button, and drop the LUT tool into the “Display” tab in your Player options. By doing this, the LUT tool will be applied to anything displayed in the Player.

    Quote:
    After compositing, I have to export to DPX Cineon. Should I apply ‘log’ tool or not?

    You do not need to apply the LUT tool per se. Instead, you should set the “Format Options” in your Publish project settings (I am going from memory, the labels might be slightly different) to set a color conversion to be done when publishing in DPX format.

    Hope this helps.

    Regads,

    Charles

    I really appreciate if there’s any explanation about this workflow (gamma, linear, log things). It’s quite confusing though…

    Thanks alot.

    Leo[/quote]

    #215023
    Larry
    Participant

    Place to start:

    http://miafx.com/wiki/tiki-index.php?page_ref_id=307

    Maybe this could help.

    #215020
    chris
    Participant

    if you are doing a full CG film, there is no real reason to work in LOG. i’d render to 16bit linear (like PNG, for example) or floating point EXR.

    log is kinda an analog thingy.

    //gD

    #215024
    dennis
    Participant

    Thanks for the link! it helps a lot 🙂
    Also thanks for all the tips guys..

    #215026
    filipp
    Participant

    Hi,
    I’ve got an update on lin2log workflow. It’s been discussed on the aera (http://area.autodesk.com/index.php/forums/viewthread/20197/) and I think it is very interesting.
    To sum up, the “Log” tool in Toxik 2009 SP1 is not doing what’s expected and has a different result than the “Lin2Log” from both nuke and shake. A good workaround has been pulled of by Mark Rasmussen, so in case you need to convert Linear data to Log space, I encourage you to read this thread.
    Autodesk has been informed of this issue and should work on the solution.

    cheers,
    antoine.

    #215021
    chris
    Participant

    toxik has 1D and 3D luts that can do all kinds of color space conversions, but to reiterate, if you are doing all CG, there is no reason to be rendering out of your 3D app and working in log colorspace in any compositing applicaiton.

    stay linear.

    //garyD

    #215027
    Anonymous
    Inactive

    Sorry to bump an old thread, but we are more and more working with 3dsmax composite in our compositing team, and working on wide gamut monitors (they are calibrated with spyder3 but to icc standard) we get oversaturated colors. I know how to apply lut file to only the viewer, as output files are ok, but how can I create/generate this lut file to match my monitor gamut ? Does I need any specific software ? Will it work with dtp94 or spyder3 or i1 display2 ?

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