CSC151 2007S, Class 20: Transforming Colors

Admin:
* CONGRATULATIONS VIDA!!!!!!!!!!!
* I forgot to take the quiz to my mid-career faculty workshop this weekend, 
  and hence have not had a chance to grade it.
* HW5
  * Does anyone who missed class on Friday need a partner?
  * Are there questions?
* My laptop goes in for service today, which is likely to delay some things.
* Office hours cancelled tomorrow a.m. (meeting).
* Reading for tomorrow: Transforming images.
* Quiz!

Overview:
* Computing new colors from old.
* Some basic transformations.
* Transforming pixels and images.

This week: Returning to pixel model of images
* To work with this model:
  * Get and set individual pixels
    (image-set-pixel! image col row color)
    (image-get-pixel image col row)
  * Tedious to work with this model
    * Today: A little tedium is helpful
* Broader: ONce you have an image, transform it

(load "/home/rebelsky/glimmer/gimp-2.4/share/gimp/2.0/scripts/glimmer.scm")