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    [ANSWERED] Question about minimizing projector light bleed

    How To... ?
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    • dbini
      dbini @TiffTiff last edited by

      @tifftiff
      I didn't realise this was so small and close. that's going to concentrate your light source on a small area, so it will be too bright at this distance. check it a few metres from a wall - i bet the grey square disappears, unless you are in a completely dark room, where you may be able to see the edges of the projection a bit.

      John Collingswood
      taikabox.com
      2019 MBPT 2.6GHZ i7 OSX15.3.2 16GB
      plus an old iMac and assorted Mac Minis for installations

      Skulpture T 2 Replies Last reply Reply Quote 1
      • Skulpture
        Skulpture Izzy Guru @dbini last edited by

        Ah yes - if you are very close then things change such as the brightness, focus and general quality, you can find out more here: https://www.projectorcentral.c... 

        Graham Thorne | www.grahamthorne.co.uk
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        T 1 Reply Last reply Reply Quote 0
        • D
          DillTheKraut @TiffTiff last edited by DillTheKraut

          @tifftiff said:

          How can I reduce the leaking light?

           If the issue comes from the residual light as it is very likely, you probably can't. It is a construction related hardware issue. On modern laser projectors you can stepless adjust the light source intensity. Therefor you could balance between picture brightness and backlight (residual light) intensity.
          Conventional light bulbs in old projectors always have the full light power level. You can't lower this with the standard brightness level setting, as this only relates to the video input signals (source) brightness, not the 'backlight' power (Which is kind of the same like the backlight level in some LCD TVs). Though some bigger projectors does have a physical iris for the dynamic brightness feature. On some you can adjust the general light intensity with it.

          As I wrote, if you move to the bigger projection, this issue will be less intense there.

          T 1 Reply Last reply Reply Quote 1
          • dbini
            dbini last edited by

            @tifftiff

             If you still have an issue with the black background showing up when projecting at full size, the EB-G5600 has Eco Mode, which drops the output down to 3600 Lumens, which may help.

            John Collingswood
            taikabox.com
            2019 MBPT 2.6GHZ i7 OSX15.3.2 16GB
            plus an old iMac and assorted Mac Minis for installations

            DusX T 2 Replies Last reply Reply Quote 2
            • DusX
              DusX Tech Staff @dbini last edited by

              Another option, since it seems you may have more light than you require, you could change the projection surface. Likely you are looking at a white surface (wall) for projection, but if you make the wall mid grey, it will consume more of the light.

              Try your projection test on a piece of black construction paper and compare.

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              D T 2 Replies Last reply Reply Quote 2
              • D
                DillTheKraut @DusX last edited by

                @dusx said:

                <p>Another option, since it seems you may have more light than you require, you could change the projection surface. Likely you are looking at a white surface (wall) for projection, but if you make the wall mid grey, it will consume more of the light.</p><p>Try your projection test on a piece of black construction paper and compare.</p>

                 That's a very good suggestion. There are special projection screens which are black on purpose. With a black background, you get a deeper contrast, especially in a surroundings which are not perfectly dark. E.g. with a lot of ambient or even direct light to the screen. A white screen reflects more of the ambient light, which makes the dark part in the projection brighter. With a darker screen you can compensate this. But you might need more power to push the bright parts of the picture.

                1 Reply Last reply Reply Quote 1
                • T
                  TiffTiff @dbini last edited by

                  @dbini thank you! that's the thing, I will be working in a pitch black space and every light 'leakage' is bad. I have added an analog mapping, without subtracted center circle as it's pretty difficult. But it looks already better this way.

                  dbini 1 Reply Last reply Reply Quote 0
                  • T
                    TiffTiff @Skulpture last edited by

                    @skulpture thank you!!!

                    1 Reply Last reply Reply Quote 0
                    • T
                      TiffTiff @DillTheKraut last edited by

                      @dillthekraut thank you! I have added a physical map and will probably use some kind of gobo or iris in the end

                      1 Reply Last reply Reply Quote 0
                      • T
                        TiffTiff @dbini last edited by

                        @dbini thanks! tried eco and it's better!!!

                        1 Reply Last reply Reply Quote 0
                        • T
                          TiffTiff @DusX last edited by

                          @dusx thank you! yes, black background helps a lot

                          1 Reply Last reply Reply Quote 2
                          • dbini
                            dbini @TiffTiff last edited by

                            @tifftiff

                            your physical mask looks good, but you might want to test it over a longer time - as the projector warms up it might soften the glue on the tape, leading to some comedy sagging. 4500 lumens might also warm up the mask quite a lot - be careful you are not creating a fire risk.

                            John Collingswood
                            taikabox.com
                            2019 MBPT 2.6GHZ i7 OSX15.3.2 16GB
                            plus an old iMac and assorted Mac Minis for installations

                            1 Reply Last reply Reply Quote 3
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