Elizabeth Longnecker

ILLUSTRATIVE EXAMPLES

;;; 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

WRAPPING PROCEDURES

(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?)))

(gimp-airbrush-default drawable num-strokes strokes)

;;; 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

WRAPPING PROCEDURES

(define color-select  (lambda (image color threshold)    (gimp-by-color-select (image-get-layer image)                          color                          threshold                          0                          FALSE                          FALSE                          0                          FALSE)))

(gimp-by-color-select drawable color threshold operation antialias feather feather-radius sample-merged)

;;; Procedure:

;;; create-frame

;;; Parameters:

;;; image, an image

;;; width, a real number

;;; Purpose:

;;; to create a frame around

;;; an image of width

;;; thickness

;;; Preconditions:

;;; Produces:

MANUAL ACTIONS

(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)))

ARTISTIC EXAMPLES

Ninety parallel sinusoids with linearly increasing period, Noll 1967

Computer composition with lines, Noll 1964

ARTISTIC EXAMPLES

Schotter, Nees 1968-70

ARTISTIC EXAMPLES

Infinity, Maeda 1993

• 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

GENETIC ART

1. Randomly choose a node in the donator chromosome

2. Randomly choose a node in the receiver chromosome

3. Delete everything at and below the receiver tree

4. Delete everything at and above the donator tree

5. Combine the DNA to create a new tree

(Baluja, Jochem, Pomerleau, 1994)

GENETIC ART

GENETIC ART

Two parent chromosome structures

Five potential children

(Baluja, Jochem, Pomerleau, 1994)

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

REFERENCES