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  • Compositing in photoshop - help

    Hi

    For different reasons I need to do my compositing in photoshop instead of the Vray frame buffer. We need to be able to paint masks, and other people who dont have Vray may need to open the photoshop files and edit them.
    The final image I need to produce is a PNG file with alpha channel.

    I have rendered the elements as EXR. The lighting element is the lowest layer in photoshop, set to normal. On top of that is global illumination, specular, reflection and refraction. All set to Add.

    In my C4D scene I have a floor plane to get AO shadows on the ground. This is done by having the material on the plane as a black material with a vray dirt map in the refraction channel.

    When I have a white layer at the bottom of my layer stack in photoshop the ground AO and the glass transparency seem to look correct. If I hide or delete that layer the shadow and glass alpha look much too dark. So after I convert the file to either 16 or 8 bit and save as a PNG with alpha the of the ground AO and glass come out too dark.

    Any suggestions on how to solve this?​
  • Answer selected by aleksandar.kasabov at 30-03-2023, 07:54 AM.

    Hello kimmo_hernborg,

    Upon further investigation it seems like the render elements include alpha, generated from a shadow catcher. This has been reported in our internal bug-tracking system (bug ID: VC4D-1761). This also affects your setup. Keep in mind that your workflow for getting those shadows is not optimal and we don't recommend using it. You can use a shadow catcher instead.

    We will let you know once we have an update on this issue. Thanks.

    Comment


    • #2
      Hello kimmo_hernborg,

      We will have a look into this and will get back to you soon. Thanks.
      Aleksandar Kasabov
      chaos.com

      Comment


      • #3
        Hello kimmo_hernborg,

        Could you please share your scene with us so we can investigate it further? Make sure to include all assets for it (go to File> Save Project with Assets). You can send it to us by opening a support ticket via our contact form. Please make sure to add a link to this forum thread in the body of the ticket. Thank you.
        Aleksandar Kasabov
        chaos.com

        Comment


        • #4
          Hello kimmo_hernborg,

          Upon further investigation it seems like the render elements include alpha, generated from a shadow catcher. This has been reported in our internal bug-tracking system (bug ID: VC4D-1761). This also affects your setup. Keep in mind that your workflow for getting those shadows is not optimal and we don't recommend using it. You can use a shadow catcher instead.

          We will let you know once we have an update on this issue. Thanks.
          Aleksandar Kasabov
          chaos.com

          Comment

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