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    How to Use Alpha Channel

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    • W
      WizardOfOz last edited by

      I have searched the forum and the manual but can't find an answer to this simple question.....how do you get Isadora to use a PNG file's alpha for transparency? If i plug a Picture Player into a Projector (or 3D Particle) and set the projector blend to Transparency the PNG is not displayed with it's alpha i.e the transparency is renders as black.


      Thanks

      Tom

      bonemap 1 Reply Last reply Reply Quote 0
      • bonemap
        bonemap Izzy Guru @WizardOfOz last edited by

        @wizardofoz

        Hi Tom,

        Is this Mac or pc?

        I would be going back to Photoshop and ensuring that the image is being exported without additional layers being combined and that the transparency is fully resolved in the export/save as dialogue.

        Best wishes

        Bonemap 

        http://bonemap.com | Australia
        Izzy STD 4.2 | USB 3.6 | + Beta
        MBP 16” 2019 2.4 GHz Intel i9 64GB AMD Radeon Pro 5500 8 GB 4TB SSD | 14.5 Sonoma
        Mac Studio 2023 M2 Ultra 128GB | OSX 15.3 Sequoia
        A range of deployable older Macs

        W 1 Reply Last reply Reply Quote 0
        • W
          WizardOfOz last edited by

          Hi Bonemap,

          If I "Save as" to PNG from Photoshop Isadora does not see the transparency, the image has only one layer. If I export a PNG from After Effects it does see the transparency. 

          Tom

          1 Reply Last reply Reply Quote 0
          • W
            WizardOfOz @bonemap last edited by

            @bonemap said:

            @wizardofoz

            Hi Tom,
            Is this Mac or pc?
            I would be going back to Photoshop and ensuring that the image is being exported without additional layers being combined and that the transparency is fully resolved in the export/save as dialogue.
            Best wishes
            Bonemap 

             this is Mac 10.13.6 & Izzy 2.6.1

            1 Reply Last reply Reply Quote 0
            • W
              WizardOfOz last edited by

              OK, not sure whats going on....it wasn't working, then working and now not working again. Using the same files!


              I am doing some systematic tests and will re-post results.

              Tom

              1 Reply Last reply Reply Quote 0
              • bonemap
                bonemap Izzy Guru last edited by

                Hi Tom,

                I have just done a quick test with an PNG 'save as' from Photoshop: It all looks OK in this simple patch using Isadora 2.6.1.

                What other effects/actors are you using inline with the PicturePlayer?

                best wishes

                Bonemap

                http://bonemap.com | Australia
                Izzy STD 4.2 | USB 3.6 | + Beta
                MBP 16” 2019 2.4 GHz Intel i9 64GB AMD Radeon Pro 5500 8 GB 4TB SSD | 14.5 Sonoma
                Mac Studio 2023 M2 Ultra 128GB | OSX 15.3 Sequoia
                A range of deployable older Macs

                1 Reply Last reply Reply Quote 0
                • W
                  WizardOfOz last edited by

                  After a few hours testing the transparency issue is linked to the media image size, the Isadora Video Preference "Default Resolution" & "When Combining Video" is set to "Scale to Default Resolution". I have added a link to a Zip containing the Izzy file, source picture files, two screen grabs of the results and one of my Video Preference settings. This also seems to effect transparency elsewhere like the 3D Particle actor.

                  1. With Default Resolution at 1920x1080 and "Scale to Default Resolution" = 1920x1080 PSD has transparency and the 1280x720 does not.

                  2. With Default Resolution at 1280x720 and "Scale to Default Resolution" = 1280x720 PSD has transparency and the 1920x1080 does not.

                  3. Changing "When Combining Video" to either "Scale to Largest Image" or "Scale to Smallest Image" the issue goes away.

                  I still can't account for my previous experience of the transparency working and then not working simply after replacing a Picture Player in the Izzy file and nothing else. So the issue might only be displayed intermittently.

                  DOWNLOAD FILES

                  Tom

                  1 Reply Last reply Reply Quote 1
                  • Woland
                    Woland Tech Staff last edited by

                    @wizardofoz said:

                    After a few hours testing the transparency issue is linked to the media image size, the Isadora Video Preference "Default Resolution" & "When Combining Video" is set to "Scale to Default Resolution". I have added a link to a Zip containing the Izzy file, source picture files, two screen grabs of the results and one of my Video Preference settings. This also seems to effect transparency elsewhere like the 3D Particle actor.1. With Default Resolution at 1920x1080 and "Scale to Default Resolution" = 1920x1080 PSD has transparency and the 1280x720 does not.2. With Default Resolution at 1280x720 and "Scale to Default Resolution" = 1280x720 PSD has transparency and the 1920x1080 does not.3. Changing "When Combining Video" to either "Scale to Largest Image" or "Scale to Smallest Image" the issue goes away.I still can't account for my previous experience of the transparency working and then not working simply after replacing a Picture Player in the Izzy file and nothing else. So the issue might only be displayed intermittently.DOWNLOAD FILESTom

                     Please create a support ticket using the link in my signature.

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                    • W
                      WizardOfOz last edited by Michel

                      I have logged a ticket.


                      Cheers

                      Tom

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