Topic 4: Graphic

Question 1

definition of graphic

Answer 1

digital representation of non-text information

Question 2

functions of graphic

Answer 2

• background
• informational content
• navigational controls for multimedia products

Question 3

two types of graphic

Answer 3

• bitmap
• vector

Question 4

define bitmap

Answer 4

• raster graphics or pixelized graphic
• combination blocks of different colors (pixel) to represent an image
• specific location and color value

Question 5

characteristics of bitmap

Answer 5

• represent subtle gradation of shades and color by blending pixels
• resolution-dependent
• difficult to increase or decrease size without sacrificing quality

Question 6

what is interpolation

Answer 6

decrease size - throw away pixels

increase size - create new pixels by estimating color values based on surrounding pixel

Question 7

define vector

Answer 7

• made up of lines and curves by mathematical objects called vector
• store each objects as formula

Question 8

characteristics of vector

Answer 8

• resolution-independent
• scaled to any size and printed at any resolution without losing detail

Question 9

functions of vectors

Answer 9

• logos
• font
• charts and graphs

Question 10

advantages of vector

Answer 10

small file sized - store only instructions not the data of pixel

reusability - easily resized, recolored and reshaped

not restricted to a rectangular shape - placed over objects below will show through

Question 11

disadvantages of vector

Answer 11

• no standard vector-based file formats

Question 12

3 types of resolution

Answer 12

• color
• image
• display

Question 13

define color resolution

Answer 13

• refer to number of color one pixel can represent, in bits

Question 14

define image resolution

Answer 14

• measures the dimension of an overall image
• in width and height

Question 15

define display resolution

Answer 15

• number of pixels can be displayed on computer screen

Question 16

common display resolution

Answer 16

• 800x600
• 640x480

Question 17

formula of display resolution

Answer 17

width x height x (color depth/8)

Question 18

relationship between resolution and performance

Answer 18

• higher the resolution
• higher memory usage
• larger file size
• slower performance

Question 19

file format of graphic

Answer 19

• jpeg
• png
• gif
• tiff
• bmp

Question 20

bmp

Answer 20

• no transparency
• no compression
• no animation
• platform independent

Question 21

gif

Answer 21

• transparence portion
• animation possible
• maximum 256 color
• no color information lost

Question 22

jpg

Answer 22

• no animation
• no transparency
• compression available
• maximum 16.7 million

Question 23

png

Answer 23

• transparence portion
• more than 16.7 million
• no color information lost
• no animation
• well compression

Question 24

tiff

Answer 24

• very high compression capability