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Illustrative Examples

Illustrative Examples. Elizabeth Longnecker. Wrapping Procedures. ( gimp-airbrush-default drawable num-strokes strokes).

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Illustrative Examples

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  1. Illustrative Examples Elizabeth Longnecker

  2. Wrapping Procedures (gimp-airbrush-default drawable num-strokes strokes) • ;;; Procedure:;;; image-airbrush-line!;;; Parameters:;;; image, an image;;; pressure, a real;;;   col1, a real;;;   row1, a real;;;   col2, a real;;;   row2, a real;;; Preconditions:;;;   0 <= pressure <= 100;;; Purpose:;;;   Draw a line with set airbrush pressure and ;;; the current foreground color, ;;;   beginning at (col1,row1) and ending at (col2, ;;; row2).;;; Produces:;;;   image, the original image (define _image-airbrush-line!  (lambda (image pressure col1 row1 col2 row2)    (gimp-airbrush (image-get-layer image)                   pressure                           4                           (vector col1 row1 col2 row2))    (cond ((context-immediate-updates?) (context-update-displays!)))    image))(define image-airbrush-line!  (guard-proc 'image-airbrush-line!              _image-airbrush-line!              (list 'image 'real 'real 'real 'real 'real)              (list image? real? real? real? real? real?)))

  3. Wrapping Procedures (gimp-by-color-select drawable color threshold operation antialias feather feather-radius sample-merged) (define color-select  (lambda (image color threshold)    (gimp-by-color-select (image-get-layer image)                          color                          threshold                          0                          FALSE                          FALSE                          0                          FALSE))) ;;; Procedure;;; color-select;;; Purpose;;; wrapped form of gimp-by-color-select;;; Defaults:;;; operation: 0 (CHANNEL-OP-ADD);;; antialias: FALSE;;; feather: FALSE;;; feather-radius: 0 ;;; sample-merged: FALSE;;; Parameters;;; image - an image;;; color - color to select;;; threshold - how far an rgb value can be off from specified color;;; Pre-Conditions;;; image is not NULL;;; Post-Conditions;;; color is selected;;; Produces;;; image with certain range of color selected

  4. Manual Actions • ;;; Procedure: • ;;; create-frame • ;;; Parameters: • ;;; image, an image • ;;; width, a real number • ;;; Purpose: • ;;; to create a frame around • ;;; an image of width • ;;; thickness • ;;; Preconditions: • ;;; Produces: (define create-frame (lambda (image width) (image-select-rectangle! image 0 0 image-width width) (image-fill-selection! image) (image-select-rectangle! image 0 0 width image-height) (image-fill-selection! image) (image-select-rectangle! image 0 (- image-height width) image-width width) (image-fill-selection! image) (image-select-rectangle! image (- image-width width) width image-height) (image-fill-selection! image)))

  5. Artistic Examples Ninety parallel sinusoids with linearly increasing period, Noll 1967 Computer composition with lines, Noll 1964

  6. Artistic Examples Schotter, Nees 1968-70

  7. Artistic Examples Infinity, Maeda 1993

  8. Genetic Art • What is it? • AI concept, artificial evolution • Combine “genetic algorithms with computer graphics” (Baluja, Jochem, Pomerleau, 1994, p.326) • With the user’s guidance, create natural selection • Idea that if the user chooses the most aesthetic images, these traits will carry on to the children • Start with simple images and combine them to make complex, interesting images

  9. Genetic Art • Randomly choose a node in the donator chromosome • Randomly choose a node in the receiver chromosome • Delete everything at and below the receiver tree • Delete everything at and above the donator tree • Combine the DNA to create a new tree • (Baluja, Jochem, Pomerleau, 1994)

  10. Genetic Art Two parent chromosome structures Five potential children (Baluja, Jochem, Pomerleau, 1994)

  11. References • Baluja, Shumeet, Jochem, Todd, and Pomerleau, Dean. (1994). Simulating user's preferences: towards automated artificial evolution for computer generated images. Connection Science, 6(2 & 3), Retrieved from http://citeseerx.ist.psu.edu doi: 10.1.1.12.8580 • Nees, Georg. (Artist). (1968-70). Schotter. [Web]. Retrieved from http://amethyst.vam.ac.uk/images/image/58619-popup.html • Noll, A. Michael. (Artist). (1964). Computer composition with lines. [Web]. Retrieved from http://www.citi.columbia.edu/amnoll/CompArtExamples.html • Noll, A. Michael. (Artist). (1967). Ninety parallel sinusoids with linearly increasing period. [Web]. Retrieved from http://www.citi.columbia.edu/amnoll/CompArtExamples.html

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