Excersise Set 1


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Excersise Set 1

I have placed the Templates here as well to help you with the excersises below.

To open a picture and display it on the screen: Template1
To open a picture, display it on the screen, do something to each pixel, show results: Template2

Here are some pictures I used in class. You can right click on them with your mouse to save them on your computer. I suggest you use them as starters, but then try using your own. Remember, these are .jpg images.

color_strip (1px x 6px)	color_lines (10px x 6px)	color_stripes(100px x 120px)	color_flag(180px x 120px)

Here are some problems to try on your own. Don't look at my answers until you have tried your own solution at least twice.

1) Write a function named midGreen that has a picture’s name hardcoded as the variable file; shows the picture in the show box; changes the entire green channel of the picture to equal 128; and repaints the picture. Answer 3.1

2) Write a function named noRed that has the user enter a picture’s name on function call; shows the picture in the show box; changes the entire red channel of the picture to equal 0; and repaints the picture. Answer 3.2

3) Write a function named allBlue that loads a picture from pickAFile ; shows the picture in the picture tool; changes the entire blue channel of the picture to equal 255; and repaints the picture. Answer 3.3

4) Write a function named halfGreen that loads a picture from pickAFile ; shows the picture in the picture tool; changes each pixels green value to half of what it was and repaints the picture. Answer 3.4

5) Write a function named quarterRed that has a picture’s name hardcoded as the variable file; shows the picture in the show box; changes each pixels red value to a quarter of what it was; and repaints the picture. Answer 3.5

6) Write a function named redBlue that has the user enter a picture’s name on function call; shows the picture in the show box; changes the red value of each pixel to equal its blue value; and repaints the picture. Answer 3.6

7) Write a function named blueHalfGreen that has the user enter a picture’s name on function call; shows the picture in the show box; changes the blue value of each pixel to equal half its Green value; and repaints the picture. Answer 3.7

8) Write a function named makeNegative that loads a picture from pickAFile ; shows the picture in the picture tool; changes the color of each pixel to its negative; and repaints the picture. Answer 3.8

9) Write a function named makeBandW that loads a picture from pickAFile ; shows the picture in the picture tool; changes the color picture to black and white; and repaints the picture. Answer 3.9

10) Try making up some functions of your own.

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Spring 2007 materials last edited on 21 August 2007 at 10:44 pm by user-1121vkp.dsl.mindspring.com