Difference between revisions of "CSC220 Lab 2 2010"
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* use '''wget''' (see [[CSC220 Lab 1 2010|Lab 1]]) to retrieve all three images into your account. Use a for-loop! Something like this is a good start: | * use '''wget''' (see [[CSC220 Lab 1 2010|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: | * 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? | * Can you tell what these three pictures have in common? | ||
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* Overlay the 220 road sign image on top of the car: | * 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. | * 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). | * 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
Page under construction!
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).
