Homework #3 - Due in class on Wednesday November 15th.

If you have questions about any parts of this assignment, please come to see me in office hours.

Question #1: Build a Huffman tree given the frequency analysis values below and draw that tree on your answer sheet.

Red	8
Orange	22
Yellow	11
Green	3
Blue	42
Indigo	10
Violet	4

Using this tree, decode the following sequence into colors and write that decoding on your answer sheet.

      11011100000101111110010

Question #2: Take a new picture of a scene with trees in it. Using a program such as GIMP, resave this picture at JPG 50%, JPG 30%, JPG 10%, and GIF. While doing this, do not look at the sizes of the files created. Draw the following table on your answer sheet.

Saved As	Subjective Visual Quality	File Size
Original JPG
JPG 50%
JPG 30%
JPG 10%
GIF

First, look at each picture and on a scale of 1 to 100, fill in the column for "Subjective Visual Quality" in the table. After doing that, look at the sizes of the files created, and fill in the "File Size" column with the number of kilobytes each file. Be sure to use "Size" and not "Size on Disk" for this column. Finally, decide where you feel the "right" level is for saving pictures that you plan to send someone via e-mail knowing that you will be sending them around 26 image files. Justify your selection.

Question #3: Given the image available at http://www.cs.umd.edu/class/fall2006/honr279k/CropThis02.jpg crop the image using four different composition rules as your guide. You may rotate the image if you need to. After cropping, scale it down to either 640x480 or 480x640. For each, print the image (black and white is fine for printing) and trace the guide you used over the image. Of the croppings, select the one you feel is best, and write a one to two paragraph explanation of how you created the cropping, and why you think it is the best of the four.

Question #4: Interview a person who is between the ages of 40 and 55 and has some type of "print" photograph collection. You will interview them on the topic of photography and photographic collections. Ask them things such as how they generally obtained photographs, how they decided when to take a picture of something, how they organize their photographs, and whether they are happy with the way in which their collection is currently organized. You should ask about their current photography, and feel free to ask questions to see how they compare/contrast their experiences with "print" photography to digital photos and collections. Submit a 450-750 word write-up of what your interview revealed.