Projections

Projections of images with light.

Types of Projectors

Shadow projectors:
Shadows from large slide in front of point source Usually no lens or reflector
    Linnebach projector
    Cinebach projector

Lens projectors: Lekos & Gobos Slide Projectors Scenery Projectors

Digital Projectors
Allow the use of computers to generate, store, and run projections.

Grew out of both cinema and business presentation software.
   Requires:
   --Digital projector and computer
   --Computer files;  PICT, BMP, PCX, WMF, JPG, GIF etc.
   --Scripting and presentation software
     •Macintosh: Macromedia Director
     •Windows: Powerpoint or Director

Calculating Image size:
     i/o = I/O
	where i= size of slide image
		o= distance slide to lens
		I= size of image on screen
		O= distance lens to screen

Lighting Considerations with Projections

Two types of Screens:
Front Projection
     Often easier to get long enough throw
     Images can be created and used "right way around"
     Screens are easier and cheaper to create.
     Needs a powerful projector
BUT:  More sensitive to ambient light

Rear Projection
     Available throw distance usually shorter
     Images must be projected "backwards"
          (projectors may do that for you)
     RP screens more expensive than FP screens
     RP screens more efficient generally
     Less sensitive to ambient light

IN EITHER CASE:
Important to Reduce or compensate for Keystoning
Must keep ambient light off screens and images
     Risk having big, flat dull white surface in back
     when projections are not in use.

JUMBOTRON:  Uses LED panels to create large TV screen.
Much like a very large LCD computer screen in concept
Most suitable for large arena  shows rather than theatre setting because of the 
     support and equipment required.

Design considerations:
•Projections must be integrated into show
•ALL other elements , esp. lighting and scenery, must be done in way to permit and support projections
•You must allow time to do them properly. 
     Gather images 
     Prepare them for projecting Set-up equipment 
     Allow sufficient tuning time
•Another option:  multiple projectors, each doing a portion of image, not whole thing.
An Example: BEAST ON THE MOON
	* Prepare originals and create "cast"
	* Prepare script
	* Create projector file

©2000, Mick Alderson