By Prof. Dr. Herbert W. Franke (auth.)
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Extra info for Computer Graphics — Computer Art
Matrix Calculus. Arrays of numbers with which calculations can. be carried out similarly to numbers are called matrices. ible to perceive every picture as a matrix. This opens the possibility of carrying out calculations with pictures - adding them (which amounts to a simple overlay), multiplying them, raising them to a higher power, etc. Quite often, unexpected results arise, among others abstractions which leave the original motifs recognizable; frequently the results are purely abstract, but visually pleasing.
Four realizations of a very versa- [> tile program, in which the sign repertoire can befreely selected. Here it consists of three signs distributed over a base grid: "horizontal line element", "vertical line element" and "empty sign". The production procedure occurs in one movement which embraces the entire grid area. From one occupation spot to another it is decided which signs are to be used, based on a probability function dependent on the signs already placed. The result is a distribution with "weighted" chance; the individual signs are packed in different densities in the various areas of the field 43 7 Computer Graphics in Practice While computer graphics initially focussed on program-controlled generation of pictures, various other, far more demanding areas of application have developed.
One of the peculiarities which needs to be taken into consideration is the banding effect, the fact that, by repeating the image output several times per second, band like picture segments of the developed photograph appear to be cut off or underexposed. This is caused by the line-by-line scanning of the electron beam; if the exposure times are too short, only part of the scanned picture is exposed. Therefore it is advisable to expose the screen for not less than one second. The required long exposure times prevent the free-held taking of a picture; use of a tripod is indispensable.