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Multichannel EXR: Corrections are not saved to render elements

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  • Multichannel EXR: Corrections are not saved to render elements

    Hey guys,
    I found another issue with Multichannel EXR that is driving me nuts. In the VFB, we apply several corrections to the image, like exposure, white balance etc to get a better match to the reference plate.
    When saving the EXR as seperate channels, those corrections are saved to the render elements as well.
    When saving to Multichannel EXR, the corrections are only applied to the RGB, the render elements are saved without corrections.

    Please find attached to screenshots.

    Left side, RGB element from seperate EXR, right side RGB from Multichannel EXR. Both look identical.

    Click image for larger version

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    Left side, lighting element from seperate EXR, right side lighting from Multichannel EXR. Right side is missing the corrections made in the VFB.

    Click image for larger version

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    So, how can this discrepancy be avoided? Of course, the checkbox to save the corrections are set for both ways to save, please see settings here.

    Click image for larger version

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    Click image for larger version

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    https://www.behance.net/Oliver_Kossatz

  • #2
    Well, the options' names are such for a reason. You could export the Color Corrections as a .LUT (VFB > RMB on the Display Correction layer > Save All CC to LUT) and apply it later.
    Aleksandar Hadzhiev | chaos.com
    Chaos Support Representative | contact us

    Comment


    • #3
      Originally posted by hermit.crab View Post
      Well, the options' names are such for a reason. You could export the Color Corrections as a .LUT (VFB > RMB on the Display Correction layer > Save All CC to LUT) and apply it later.
      Which is useless in Photoshop.
      There's no other way to bake in the corrections, just like the seperate channels option?
      https://www.behance.net/Oliver_Kossatz

      Comment


      • #4
        Originally posted by kosso_olli View Post
        Which is useless in Photoshop.
        What do you mean? PS has a Color Lookup layer adjustment that acceps .cube files.

        Originally posted by kosso_olli View Post
        There's no other way to bake in the corrections, just like the seperate channels option?
        Not that I know of.

        Aleksandar Hadzhiev | chaos.com
        Chaos Support Representative | contact us

        Comment


        • #5
          Originally posted by hermit.crab View Post
          What do you mean? PS has a Color Lookup layer adjustment that acceps .cube files.
          Yes, but it will look different.

          https://www.behance.net/Oliver_Kossatz

          Comment


          • #6
            if you are careful about what gets saved to a LUT from VFB it can work between VRay and Photoshop. not all the adjustment layers are saved to lut. all you get is a very simple 0-1 range cube lut.

            your options are Reinhard compression or some kind of log encoding (log would be custom curves in VFB and .csp lut is PS) before other VFB colour corrections (that would be saved to a lut).


            edit:
            ----
            Last edited by piotrus3333; 05-09-2024, 06:47 AM.
            Marcin Piotrowski
            youtube

            Comment


            • #7
              making custom curve adjustment:
              when you save .vfbl file from VFB with curves adjustment layer included, you can edit the points. you can make points linear first, input just "point centre" and than smooth it automatically.
              looks like this:

              "class": "chaos.cc.curves",
              "properties": {
              "version": 1,
              "name": "mP_AgX_KrakenLog",
              "enable": true,
              "expand": false,
              "expandable": true,
              "blend_mode": 0,
              "opacity": 1.0,
              "show_preview": true,
              "curve_graph": {
              "version": 1,
              "Master": {
              "points": [{
              "point_type": 0,
              "point_center": [0.0001347560901194811, 0.0000720880925655365]
              }, {
              "point_type": 3,
              "point_center": [0.00029164133593440056, 0.044006794691085818],
              "left_vector": [-0.00005229508315096609, -0.014576690271496773],
              "right_vector": [0.00002810347177728545, 0.007833539508283139]
              }, {
              "point_type": 3,
              "point_center": [0.0003759517567232251, 0.06674453616142273],
              "left_vector": [-0.000028103473596274854, -0.007100209128111601],
              "right_vector": [0.0001734105171635747, 0.04381134361028671]
              }, {
              "point_type": 3,
              "point_center": [0.0008961833082139492, 0.1424470841884613],
              "left_vector": [-0.0001734105171635747, -0.014875858090817929],
              "right_vector": [0.00047536217607557774, 0.040778495371341708]
              }, {
              "point_type": 3,
              "point_center": [0.0023222698364406826, 0.22634030878543855],
              "left_vector": [-0.00047536217607557774, -0.018413471058011056],
              "right_vector": [0.00047443489893339574, 0.018377553671598436]​..................​
              Marcin Piotrowski
              youtube

              Comment

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