ABSTRACT
Mult i -screen W e have just ment ioned the relatively humble slide projector, w h i c h , when audiovisuals coupled up i n a bank of two, four, six or more , under computer cont ro l , is
capable of presenting a host o f new visual effects. T h e computer controls slide changes, fading, d issolving, forward and return r a n d o m access and whatever else is required, enabl ing one to p rogram rap id cascades of slide changes that may simulate a m o v i n g image, may vibrate from one predominant co lour to another at any desired frequency, or indeed to the rhy thm and tones o f a par t icular tune, may present a slide out of sequence, or offer r a n d o m access l ib ra ry facilities, and so on . T h e p r o g r a m m i n g of such a show is a specialist and t ime-consuming task, but the results are often wel l wor th it . O n c e a par t icular s l ide-mix effect has been p rog rammed , it can , of course, be transferred to videotape through a telecine cha in , so that mul t ip le copies or repeat presentations may be easily managed without the compl ica t ion of always setting up a bank of computer-control led projectors. T h e mult i -project ion systems now available may we l l , i n the l ong r u n , be destined to work as special effects generators for video presentations, rather than regular projection systems. H o w e v e r , they have opened up a new d imens ion of creativity i n the use of still images for dynamic displays.
