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Bruce Brown

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    http://www.mentalmedia.com.au

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    Male
  • Location
    Sydney, Australia

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  1. I know its quite a long time since the last posting here but for what its worth... We create 'line up slides' for each show that are specially designed for each installation. The 'slide' temanology comes from when we were doing this with slide projectors but the principal remains the same. In most cases they include concentric circles and various parallel lines in 1-3 pixel widths (depending on the projector resolution) that are then converged to create perfect alignment. They can be white on black or black on white but its generally easier to read the overlap if the lines are white. Most of our work is for permanent installation so the 'line-up slide' images are loaded on a non edge blended layer before or after the show timeline start or end points. Once we have done the mechanical line up of the projectors and made geometrical adjustments the house technician is able to maintain the alignment. A special maintenance mode cue in the control system jumps to the spot on the timeline and allows the house technicain to manually adjust projector alignment when required. A short lesson in the principals of projector alignment and the provision of easily read and used line up images ensures most of our productions look as good as day one most of the time.
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