D20c Basic Graphics Objectives
                           Review Questions

Answers are at the bottom of this document

1. What is the basic unit of storage on any computer?


2. What is a pixel?


3. What is meant by the term "resolution" in computer displays?


4. What is the most common way of measuring resolution 
   on computer displays? 


5. What is meant by the term "pitch" in computer displays?


6. What is meant by the term "bit mapping"?


7. How are colors represented in computer files?


8. What is meant by the term "color depth"?


9. If an image is stored using a certain number of bits 
   per pixel, how many colors can be represented? 
   	1 bit	___ colors 
   	2	___ 
   	4	___ 
   	8	___ 
   	16	___ 
   	24	___ 


10. In addition to bit mapping, how else are graphics 
    stored in computers? 


11. What is the fundamental trade-off involved in 
    representing quality images on a computer? 







ANSWERS
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1. a "bit" or "binary digit"

2. The smallest picture element or dot displayed by a computer.


3. The amount of detail or accuracy in a display; high 
   resolution displays can represent fine details, and low 
   resolution display represent only coarse details. 


4. dots per inch (dpi)


5. the size of a pixel, usually measured in fractions 
   of millimeters 


6. a way of putting images in computer storage by 
   assigning one or more bits to represent a pixel in the 
   image 


7. by mapping multiple bits to a pixel, and assigning 
   certian bits to represent the strength of each of the 
   primary colors in that pixel 


8. the number of colors in an image that can be 
   represented in the computer; color depth depends on the 
   number of bits mapped to each pixel. 


9. 	1 bit	2 colors
	2	4
	4	16
	8	256
	16	65,536 (65K or approximately 65 thousand)
	24	16,777,216 (16M or approximately 16 million)


10. using vectors, rather like connecting the dots


11. the better the quality the larger the file and the 
    longer it takes to download