# exam1

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```					MUMD-290: Exam 1            Name:_____________________________________

1. Computers use base-_____ , which is also known as the ___________ numbering system.

2. Fill in the blanks with “bit(s)” or “byte(s)”: Eight _________ equals one _________.

3. A pixel that can have only one of two possible color values requires _____ bit(s) to store the
color information.

4. Assume the following data is a black and white 4 X 7 bitmap image (1-bit color depth) with 0
being black and 1 being white:

11111 10001 10111 10001 10111 10001 11111

What is the image? (Hint: it’s a capital letter) ____

5. If you use a byte to store the grayscale information of each pixel in a grayscale image, how many
gray levels are possible for each pixel? _________

6. Which of the following sizes is the largest?
A. 1 GB
B. 20,000 KB
C. 2000 MB
D. 2 KB

7. High quality digital photographs are using a few bytes, KB, MB, or GB. ____

8. Convert the following binary numbers to decimal. Remember that starting from right to left; each
bit represents a power of two, i.e., 1, 2, 4, 8, 16, etc.

9. Convert the following decimal numbers into binary.

10. The pixel dimensions of an image, i.e., 2400 X 1200, represents

a) The images quantization level
b) The images sampling rate

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11. The color depth of an image, i.e, 8-bit or 256 colors, represents

a) The images quantization level
b) The images sampling rate

12. Even though the GIF image format uses lossless compression, explain why GIF images “appear”
to lose quality when you compare them to the original photograph?

13. The cones of our eyes detect a continuous signal, so in principle we can detect infinitesimally
small changes in color even though our brains might not be able to “tell” the difference.

a) True
b) False

14. Digital images can store a continuous signal, so in principle we can store all the colors that the
human eye can detect.

a) True
b) False

15. A digital signal is like a real number, i.e, 1.6282342349…, we can store values of infinite
precision.

a) True
b) False

16. An old fashioned record is analog because in principle the etching of the record’s surface can
store infinitely many values. i.e., there are an infinite number of intermediate depths between the
top of the record surface and the deepest etch marking.

a) True
b) False

18. Which of the following factors will increase the file size of a digital image? (circle one)

A. capturing the image at a higher resolution
B. increasing the color depth (bits per pixel)
C. both A and B will increase the file size

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19.

20. A digital image captured at a higher resolution. (circle all correct responses)

A. has more details than the same image stored at a lower resolution
B. represents more colors than the same image stored at a lower resolution
C. has greater bit depth than the same image stored at a lower resolution
D. has a larger file size than the same image stored at a lower resolution
E. has more total pixels than the same image stored at a lower resolution

21. Images composed of individual pixels which represent spatial sampling are typically called.
(circle all correct responses)

A. Vector
B. Raster
D. Bitmap
E. Splines

22. Are fonts typically stored as _____________.

23. The main advantage(s) of vector graphics over bitmapped images is (are) ? (circle all correct
responses)

A. scalability or resolution independence of images
B. ease of editing the image content pixel by pixel
C. more compact files compared to bitmapped images

24. Describe in your own words what “scalability or resolution indepence” means? Hint: Remember
the different between scaling/increasing fonts vs. a bitmap image of a font.

25. Generally speaking, how does the file size change if the total number of pixels of an image is
doubled?

26. Generally speaking, how does the file size change if the bit depth of an image is increased from
8-bit to 24-bit?

27. Sometimes when you magnify a picture on your computer screen, lines that should be straight
lines appear to be jagged. This effect is called? (circle one)

A. anti-aliasing
B. aliasing
C. dithering
D. indexing

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28. The term “pixel” is contracted from the words _____________ ______________.

29. A pixel is a point sample, not a little square, i.e., it could be drawn as a circle or dot

a) True
b) False

30. An 8-bit color depth allows ______________ colors.

31. A 24-bit color depth allows ______________ colors.

32. Which file extensions indicate graphics/image we studied in lab?

BMP            DOC         JPEG          TXT           PNG           GIF
JPG            PPTX        TIFF          PPT           XLS

33. What are the RGB values for highest saturation of yellow? ___ ___ ____

Hint: The RGB of the highest saturation of red is 255, 0, 0

34. What are the RGB values for highest saturation of purple? ___ ___ ____

35. The RGB scheme is used when specify colors for printing?

a) True
b) False

36. What does CYMK stand for?

C________
Y________
M________
K________

37. What are the pixel dimensions of a 12” X 9” picture samples at 600dpi? ________ X _________

38. Describe in your own words the difference between Hue and Saturation?

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