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is it possible to set a numerical value for the aspect ratio of a projector's input?



  • I occasionally have a little bit of trouble avoiding image distortion when working with nonstandard screen ratios. Is there a way to numerically set the aspect ratio of the input to avoid this?

    Thanks


  • Tech Staff

    Scaler actor + Crop actor + FFGLPanSpinZoom might be your friends on this one. I'm not sure what you mean by "an input", could you elaborate a bit more? An input of what?

    Best wishes,

    Woland



  • I usually try to make all of my source content the same resolution as in the preferences of the Izzy file, and then - if i need to use different projectors i use Izzymap to tweak the ratio.


  • Tech Staff

    I understand things better with pictures than I do with written/verbal descriptions, so just for other folks like me, here's pictures of what @dbini was talking about.

    Isadora Preferences

    IzzyMap



  • @dbini said:

    I usually try to make all of my source content the same resolution as in the preferences of the Izzy file, and then - if i need to use different projectors i use Izzymap to tweak the ratio.

     Nice reply! But it got me thinking about what should these numbers be if one is using a TH2Go? Should the prefs be set to the 1/3 division of the TH2Go? And in Izzy Map, output should be the total TH2Go or the 1/3 ratio?

    Struggling but enjoying it,

    John


  • Tech Staff

    @jjhp3 said:

    Should the prefs be set to the 1/3 division of the TH2Go? And in Izzy Map, output should be the total TH2Go or the 1/3 ratio?

     The new features in Isadora 3 are quite handy for demonstrating this. 



    A 3x1 5760x1080 Stage made out of three 1920x1080 displays with no overlap (ideal for three TV Screens lined up next to each other) in Isadora 3:


    In Isadora 2, the Stage Preferences would look like this:


    In Isadora 2 the IzzyMap Settings would look like this:

    Splitting one 5760x1080 image across three 1920x1080 Stages in Isadora 2 would work like this:




    A 3x1 4992x1080 Stage made out of three 1920x1080 displays with a 20% overlap (ideal for making a blend with three projectors)  in Isadora 3:


    In Isadora 2, the Stage Preferences would look like this:

    In Isadora 2 the IzzyMap Settings would look like this:


    Splitting one 4922x1080 image across three 1920x1080 Stages in Isadora 2 with a 20% blend would require the use of an Edge Blend Mask for each Stage and would look like this:



    One 1920x1080 display split into thirds to make three 640x1080 Stages in Isadora 3:



    In Isadora 2, you'd set up the Isadora Preferences in the Stage Tab to look like this:

    And I believe the IzzyMap in Isadora 2 would be setup like this for each stage:



    Screenshots and example file for 2.6.1 can be found here: DROPBOX LINK

    This site is extremely helpful for making custom-sized test pattern images (for when you're blending multiple projectors): http://www.vioso.com/softegde_...

    Best wishes,

    Woland


    PS: I think I did the math right, but please anyone feel free to correct me if I'm wrong.

    In Isadora 2, using the Chopper actors to split one 5760x1080 image across three 1920x1080 Stages, with NO overlap, you need to cut it into thirds.

    • All the Chopper actors have "horz size" 33.33 and "vert size" 100 to make them chop the 5760x1080 image into three 1920x1080 pieces.
    • Left Third = Stage 1 = Chopper actor is set to -33 for horz pos (to put it to the left edge)
    • Middle Third = Stage 2 = Chopper actor is set to 0 for horz pos (to put it in the middle)
    • Right Third = Stage 3 = Chopper actor is set to 33 for horz pos (to put it to the right edge)

    In Isadora 2, using the Chopper actors to split one 4992x1080 image across three 1920x1080 Stages, with 20% overlap, you need to cut it into thirds and account for the 20% overlap.

    • Originally, with no overlap, all the Chopper actors have "horz size" 33.33 and "vert size" 100 to make them chop the 5760x1080 image into three 1920x1080 pieces.
      • To account for the 20% overlap, we need to increase the "horz size" by 20%.
      • 20% of 33.33 is roughly 6.66, so for the overlap all the Chopper actors need to be set to 39.99 for "horz size"
    • Left Third = Stage 1 = Chopper actor is set to -39.99 for horz pos (to put it to the left edge)
    • Middle Third = Stage 2 = Chopper actor is set to 0 for horz pos (to put it in the middle)
    • Right Third = Stage 3 = Chopper actor is set to 39.99 for horz pos (to put it to the right edge)