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    Question about Alpha Masks (Photoshop)

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    sketchup
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    • leedeeteeL Offline
      leedeetee
      last edited by

      Does anyone know what I'm doing wrong?

      I open up my render in Photoshop
      I open up my alpha mask in Photoshop
      I insert a layer mask onto my render
      I alt click onto the layer mask and paste the alpha mask into it
      I right click onto the chain and apply the alpha mask
      Then, for some reason, my render seems to have reduced in opacity.

      Any ideas? I have attached a screenshot.

      Cheers!


      oddsu.jpg

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      • tademaT Offline
        tadema
        last edited by

        Hello Lee,
        Place your alpha mask above your image ( file place ), right click to place it. Select/Colour Range (and with the ink dropper select black) Activate your image and delete.
        John

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        • leedeeteeL Offline
          leedeetee
          last edited by

          Thanks John, that's a really neat workaround.

          It is odd though. I've just used exactly the same method as I did originally to mask out some vegetation, and it's worked fine.

          I don't like things I don't understand!

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          • Alan FraserA Offline
            Alan Fraser
            last edited by

            It may be that the partial transparency value in the window material has led to a partial transparency in the mask in those window areas, when using your original method. It shouldn't do, but that's what appears to have happened. I can't see the checkerboard background showing through the concrete shell.
            It's usually fairly easy to firm-up such partially transparent layers in PS...just duplicate them a few times then merge them.

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            • leedeeteeL Offline
              leedeetee
              last edited by

              Ah Alan, thanks very much for the reply. That seems to be it. Very succint explanation too, many thanks.

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