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    How to make a radial gradient around image or movie?

    How To... ?
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    • T
      tadakan last edited by

      I've been trying to come up with a way to make a radial gradient around a movie in Isadora. It seems like I should be able to do it with some of the QC or CI actors (I'm using v2) but I can't seem to get them to display video.

       Basically, I'm trying to make it so that media within the bounds of the projector doesn't have hard edges. So if there's a way to apply blur to just the edges of a projector... or... suggestions? 
      I was looking at making a gradient mask in photoshop, but I couldn't seem to get that to work right either. I think that's probably the right way to do it, but I'm not sure which masking actors and settings will get the right blending going on.

      OSX 10.11.6 on 15" rMBP from Oct. 2014. 2.5ghz i7 16gb ram.

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      • vanakaru
        vanakaru last edited by

        I would do this with two movie files. On is the movie you want to project and the other is a very short(no more than 1sec long) solid color movie with a transparent part in it. You encode it with alpha channel (millions of color+ or RGB+) into PNG, ProRes or HAP. Then you will mix it in Isadora where the movie with the transparency lays on the top.

        There are some trix to produce this mask without gray/white pixels on the edge. Some years ago there has been lots of talk about this also on Modul8 forum.

        MBP 4.1 & MBP (Retina, Mid 2012) MBP Retina 2017

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        • T
          tadakan last edited by

          awesome, thanks for the hint! That makes sense. I'll see what I can find on the modul8 forum.

          OSX 10.11.6 on 15" rMBP from Oct. 2014. 2.5ghz i7 16gb ram.

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          • vanakaru
            vanakaru last edited by

            Here is a sample how to set it up in Isadora 134a6c-alpha.zip

            MBP 4.1 & MBP (Retina, Mid 2012) MBP Retina 2017

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            • T
              tadakan last edited by

              works beautifully, thanks!

              OSX 10.11.6 on 15" rMBP from Oct. 2014. 2.5ghz i7 16gb ram.

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              • gapworks
                gapworks last edited by

                @ tadakan,

                i always use the shape actor. i can change the shape, size and blur of my mask according to my needs. just take a look at the attached file if this is what you are looking for.

                3aae84-mask.zip

                Running MBP2017 / Ventura Osx 13.6.7 / 16 GB 2133 MHz LPDDR3 / Intel HD Graphics 630 1536 MB / Latest Isadora Version / www.gapworks.at / located in Vienna Austria

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                • dbini
                  dbini last edited by

                  i would use a bit of cardboard and some gaffa.

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

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                  • vanakaru
                    vanakaru last edited by

                    @dbini

                    this is a solid advise. I have done this as well. Specially if I can not afford loosing CPU power to playing transparencies and specially for using blurs(otherwise gapworks sample is the most easy one).
                    Or when layer stacking gets too complicated.

                    MBP 4.1 & MBP (Retina, Mid 2012) MBP Retina 2017

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                    • Maximortal
                      Maximortal last edited by

                      @dbini I prefere aluminum tape, more safe -,-

                      Iro Suraci | Win 10 - Ryzen 3600 - 32GB - nVidia gtx 960 4gb / Win 10 - i5 4210U - 8 GB - R5 M230 | Isadora 3.0.7| Located in Brescia, Italy

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                      • T
                        tadakan last edited by

                        thanks @gapworks! also a great suggestion. I didn't realize that the mask actor would correctly interpret a shape.

                        I made a semi-snarky comment the other day about how Isadora is like a video game with hidden achievements: there is usually a way to do what I imagine doing, and it often involves actors I haven't used, frequently named slightly differently than I would have named them.
                        I was aware of the potential for physical masking, but in this particular scenario it won't work. I want to take the hard edges off of stuff so that I can play multiple pictures and movies on a large screen (roughly 26'wide x 9'tall ~8m x 3m) I'm trying to avoid pre rendering video so that I can flexibly change positioning of stuff when I get to rehearsal.
                        Thanks again everyone! 
                        Tom

                        OSX 10.11.6 on 15" rMBP from Oct. 2014. 2.5ghz i7 16gb ram.

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                        • T
                          tadakan last edited by

                          I just tried both methods with the same video clip behind the mask and on my 15" 2.5ghz i7 MBP with 16gb ram and 750M 2gb the video mask actually seems to be a little bit easier on the resources. One instance is running roughly 30cycles (sometimes more) faster that way than the with the shape actor method. The shape actor method also drops down to about 18fps when I have safari open. It can maintain 29.5-30 when Izz is the only thing running.

                          The difference in GPU vs CPU rendering (forced by shapes and mask actor I think) is enough that I'll probably start out with building my scenes using vanakaru's method. It would be nice if we had a shapes and mask actor that were gpu compatible, being able to edit the mask quickly would certainly be handy.

                          OSX 10.11.6 on 15" rMBP from Oct. 2014. 2.5ghz i7 16gb ram.

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                          • DusX
                            DusX Tech Staff last edited by

                            Not sure if this would be a solution for you but I know that I have seen a vignette FFGL, maybe some searching would turn it up.

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                            • Fred
                              Fred last edited by

                              I used an Iris from a light attached to a metal arm coming off the projector. It was great reliable and the iris is adjustable. This was for a tour with a lot of other things to setup. The arm and iris meant that setting the "circular mask" each show was a 2 minute job.

                              http://www.fredrodrigues.net/
                              https://github.com/fred-dev
                              OSX 13.6.4 (22G513) MBP 2019 16" 2.3 GHz 8-Core i9, Radeon Pro 5500M 8 GB, 32g RAM
                              Windows 10 7700K, GTX 1080ti, 32g RAM, 2tb raided SSD

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