Mosiac http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0009775.html

This piece is a paint-by-number kit that allows the owner to paint a portrait of me with my cat Mingus. The kit includes a pre-marked canvas, a brush, and eight colors of paint. I was interested in whether collectors would choose to paint the canvas or leave it in it's original state. Would it have an impact on the value (aesthetic or monetary). If the image was colored in, who would be the author of the piece -- the painter, me, or both of us? Despite the apparent rigidity of the paint-by-number medium, the artist does have some control over the final image. The paint may be applied in different thicknesses and the lines between colors can be painted over or left intact. The artist's skill with a brush also plays a large role. Different people's versions of the painting are, in fact, quite different.

Remember Descartes and that “Cartesian” space we talked about? This is it… it has two axes that are not linearly dependent. Where they meet is 0,0 (aka the origin) and any location in this 2D space can be referred to by means of coordinates –one number  on each axis.

Mac Paint, Bill Atkinson. Out with Mac in 1984.
brush metaphor” gave non CS folk a way of thinking about creation of marks in raster-based programs—a way to define pixel values. Gives users a way to control pixel definitions with hand-eye coord similar to some traditional arts (different from image processing…)

Transparency (see-thoroughness_ of parts of brush stroke key for creating these effects

DEMO also shows use of raster inspection tool and re-coloring area by changing pixel numerical definitions

Ref scanning applet

To add to the confusion…

Photoshop not the end all be all—new research, advances all the time

Aside from variations on blur and sharpen—try to get interesting effects that look like embossing or distort the image.

Filter “profile” as visualization of kernel weights