The exam will be open-book/open-notes. I will ask for all answers to be in your own words and will want it to be obvious that you are not just rewording things, so write your answers with that goal in mind.

You may use your notes, the files you have saved in your class account, and the course web page and resources to which it directly links. You may not use a search engine to seek out other resources during the exam.

Example Question Types

At least one of these will appear on the exam. This is not an exhaustive list of possible questions or question types. Some questions might appear in modified form. You should also look at the homework questions as more example questions.


Given three monochromatic images, each representing an image taken with a single filter color in use, build a full-color image. Name that image Exam1-RGB.jpg and upload it to your grace.umd.edu account into the /pub/YOURLOGIN/ folder.


In your own words, explain the most important differences between "Lossless" and "Lossy" compression? Given that the JPG compression technique is "lossy" do you think the benefits outweight the disadvantages of your camera saving pictures in the JPG format? 


Given the following base 2 color values for a pixel in an image:
	- what are the decimal RGB values?
	- generally speaking, what color is this pixel?
	- what would the HSL values for this pixel?
Red:   00110101
Green: 10101010
Blue:  11111111


The following three parts all relate to "hot pixels":
  - define what a "hot pixel" is, and explain how it affects an image
  - describe how to identify which photosite is generating a hot pixel
  - describe one method of reversing a hot pixel's effect in an image

Define the following. Explain what happens when you change the value of each. a. aperture b. shutter speed c. ISO d. Depth of field Explain the relationship (if any) between two pairs of these (eg: what do you need to do to the ISO settings if you change the aperture).


Draw an 8x8 grid section of a CCD sensor that uses the Bayer pattern. Draw the equivalent section of a Foveon sensor. Describe the differences between the two sensors, being sure to include the percentages of each color captured in each of these.


What kind of aperture setting would be best to create a rich bokeh effect. Why is this the case?


At higher ISO settings on a digital camera, "noise" (eg: chromatic aberrations) will typically be

  (a) much more noticeable
  (b) slightly more noticeable
  (c) unaffected 
  (d) slightly less noticeable
  (e) much less noticeable


You have taken a picture of the Grand Canyon and found that the sky has been blown out to white. Is there anything that you can try to do in GIMP to recover some of the visual detail of the sky? What can you do to try to correct this problem when taking the picture the next time?


What is the relationship between the f/stop number and the amount of light reaching the film/sensor? How would you explain how to work with this to a 12 year-old?


Provide one example scenario that demonstrates a clearly ETHICAL manipulation of an image, and one example scenario that demonstrates a clearly UNETHICAL manipulation.





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