Difference between revisions of "CSC220 Lab 2 2010"
(→Creating Images) |
(→Part 1) |
||
Line 21: | Line 21: | ||
display 220a.jpg | display 220a.jpg | ||
+ | |||
+ | * Can you tell what these three pictures have in common? | ||
+ | |||
+ | * Overlay the 220 road sign image on top of the car: | ||
+ | |||
+ | composite -geometry +10+10 220a.jpg 220c.jpg 220ac.jpg | ||
+ | |||
+ | * Display 220ac.jpg to see the result. The +10+10 part of the command specify that the top-left corner of the first image (road sign) should be 10 pixels left and 10 pixels down from the second image (car). The result is a new file called 220ac.jpg. | ||
+ | |||
+ | * Using the same approach overlay image 220b.jpg on 220ac.jpg, and offset it by 850 pixels left, and 10 down (or pick your own coordinates; this is not important for this lab). |
Revision as of 10:46, 14 September 2010
Creating Images
- This part of the lab uses a very nice and powerful program that is often bundled in the various Linux distribution (Fedora, Ubuntu, Suse, etc): ImageMagick. It is a collection of different programs that allow for very clever and powerful image manipulations.
Part 1
- There are 3 images in the 220a public_html folder, called 220a.jpg, 220b.jpg, and 220c.jpg. You can see them by opening this URL: http://cs.smith.edu/~220a/
- use wget (see Lab 1) to retrieve all three images into your account. Use a for-loop! Something like this is a good start:
for i in a b c ; do echo $i echo 220${i} done
- verify that you got the images by displaying them with the display command (also part of imagemagick). Example:
display 220a.jpg
- Can you tell what these three pictures have in common?
- Overlay the 220 road sign image on top of the car:
composite -geometry +10+10 220a.jpg 220c.jpg 220ac.jpg
- Display 220ac.jpg to see the result. The +10+10 part of the command specify that the top-left corner of the first image (road sign) should be 10 pixels left and 10 pixels down from the second image (car). The result is a new file called 220ac.jpg.
- Using the same approach overlay image 220b.jpg on 220ac.jpg, and offset it by 850 pixels left, and 10 down (or pick your own coordinates; this is not important for this lab).