Overview

• Preliminaries.
  • Admin.
  • Upcoming work.
  • Questions on the exam.
• The big picture: Functions as values.
• Questions on today's topics.
• Lab.

Preliminaries

Admin

• I won't be able to hold a review session this week. I apologize.
• Don't forget that we generally can't see the effects of the pixel operations if the image is already visible.
• Don't forget that we generally can't refer to an image if you've closed it in Gimp.
• Both the graders and I remain a bit behind.
• Extra credit:
  • Thursday extra, Thursday @ 4:30 p.m., Sci. 3821, Red/Black trees.
  • CS Table Friday @ noon: Law, Order, and Computers
  • Royce Wolf Piano, Wednesday, Noon, Sebring-Lewis
  • Opera Iowa: The Elixir of Love, Thursday, 7:30, Roberts

Upcoming Work

• Exam 1 due tonight!
  • Bring printed copies to class tomorrow: Stapled, with your name on every page, signed and dated (if possible), etc.
• Wednesday's reading: Homogeneous Lists
• Lab writeup: Exercises 3 and 7a
  • Subject: CSC 151.02 Writeup 10: Transforming Images (YOUR NAME)

Questions on the Exam

Do the academic honesty statements really need to be a separate page?

No, but it's convenient.

How should we cite?

"I used this procedure which I wrote on this lab with this incredibly helpful and friendly colleague

Do we need to sign the electronic copy?

No.

Should we include the code for the drawings that we're using?

No, if it's included in the exam code we distributed.

Yes, if it's not included in the exam code.

Does a test suite suffice as an example?

Yes.

Do we need to explain the values we chose to test?

No, but a short note may not hurt.

What happens when my military->civilian does everything but 0 and 12?

You should note that you've found the problem.

You'll get partial credit.

And if you have two procedures that each partially get it, I'll look at both.

Should I attach or print drawings?

No.

The Big Picture: Functions as Values

• image-transform is magic. It applies a transformation to every pixel
• Form (image-transform image color-transformation)
• Subtle thing: Procedures are appearing in a different place
  • Traditionally (PROCEDURE INPUT)
  • Now (PROCEDURE ... ANOTHER-PROCEDURE)

Questions

Lab

Things to make our brain hurt. How do you invert redder, for the colors for which you can invert redder?

(define anti-redder (o irgb-complement irgb-redder irgb-complement))