CSC151.02 2013F, Class 38: Another Image Model: Iterating Over Positions

Overview

Preliminaries

Exam 2 returned. I've sent out an answer key.
Reminder: I get so much email that sometimes I miss some, and often I file it automatically without reading it. If you need me to read your email
- Give it a clear title that indicates that I should read it. "Homework" and "Exam" suggest to me that you are submitting work.
- Remind me if I haven't responded in a day or two.
- And remind me again if I still haven't responded.
This Friday we will be moving our class to ARH 302 (3rd floor lecture hall) to hear Hilary Mason '00. Class starts at 12:45.
- We won't have a quiz this week.
Upcoming extra credit opportunities:
- Town Hall, Wednesday, November 13, noon or 7:30 p.m.
- Learning from Alumni, Thursday, 2:15: Atul Gupta, Trustee
- CS Extra, Thursday, 4:30: Hilary Mason '00
- Informal chat with Hilary Mason, 8-9 pm
- CS Table, Friday, HCI
- Career Connections with Hilary Mason '00, CLS, Friday, 4:15-6:30 (I don't know how Career Connections work)
- Football, Saturday, noon
- Swim meet Saturday, noon. Beth swims at 3pm
- Basketball, Friday and Sunday
- Digital Commons talk Monday, November 19, 7:00 p.m. or so
- Andrew Sherburne '01 movie, Monday, November 25, 7:00 ARH 302
- "Data Sovereignty: The Challenge of Geolocating Data in the Cloud", November 25, 4:15 JRC 101
- Tuesday, November 20, 4:15 p.m., JRC 209 a gaming event with the game [d0x3d!]

Form

(image-compute (lambda (x y) *formula-to-compute-color*) *width* *height*)

Simple color blend

(image-compute (lambda (x y) (rgb-new x 0 x)) 255 255)

Colors are numbers. Who needs to be sensible?

(image-compute (lambda (x y) (+ (* x x x) (* 3 y x y))) 255 255)

How are RGB numbers computed? Something similar to

(+ (* 256 256 red) (* 256 green) blue)

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Sections: [Assignments] [EBoards] [Examples] [Handouts] [Labs] [Outlines] [Partners] [Readings]

Reference: [Setup] - [Functions A-Z] [Functions By Topic] - [Racket] [Scheme Report (R5RS)] [R6RS] [TSPL4]

Related Courses: [Davis (2013F)] [Rebelsky (2010F)] [Weinman (2012F)]

Misc: [SamR] [Glimmer Labs] [CS@Grinnell] [Grinnell] [Issue Tracker (Course)]

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