Computers for Imagemaking by David R. Clark

By David R. Clark

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Colour, False Colour and Pseudo-Colour Coloured images are more appealing than monochrome images. Features not readily apparent in a monochrome image become more noticable when they are arbitrarily coloured. There are also a whole class of images for which colour has no meaning, for example the images from a CAT brain scan or body scan. In these cases the data is the relative opacity to X-rays of a particular region in the object. Rather than display these densities as a greyscale, it is sometimes more striking to transform these pixel values into a sequence of colours.

A full d e s c r i p t i o n o f t h i s t y p e o f e q u i p m e n t , b y E d T a j c h m a n , c a n b e f o u n d in C h a p t e r 5. COMPUTATIONAL STRATEGIES In C h a p t e r 3 D e F a n t i a n d S a n d i n u s e a m e m o r a b l e m e t a p h o r ; t h e y t a l k o f t h e ' s o f t w a r e s w a m p ' . M u c h o f t h e p r o b l e m d e r i v e s f r o m t h e fact t h a t s o far, n o - o n e h a s d i s c o v e r e d t h e n a t u r a l langu a g e for i m a g e m a k i n g . C o m p u t a t i o n is in a t r a n s i t i o n p h a s e a t p r e s e n t .

Such a s s u m p t i o n s , t h o u g h usually very useful, can generate serious p r o b l e m s . F o r e x a m p l e , h e l i c o p t e r p i l o t s flying o v e r o a s e s i n d e s e r t s h a v e t o b e c a r e f u l , for t h e d e n s i t y o f t h e veget a t i o n falls o f f r e g u l a r l y w i t h d i s t a n c e a w a y f r o m t h e s o u r c e o f w a t e r : s o h e a p p e a r s t o b e c l i m b i n g w h e n in fact h e is a p p r o a c h i n g t h e g r o u n d . D i s t a n c e s o f s t a r s a r e j u d g e d b y s i m i l a r a s s u m p t i o n s for s e t t i n g t h e scaling c o n s t a n t s , as for v i s i o n .

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