graphics and media

Question 1

when is the test date?

Answer 1

oct 21

Question 2

details

Answer 2

30min
open book
answer 47 questions MC
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Question 3

what is a pixel?

Answer 3

a pixel is a picture element

- the smallest unit of information about a picture

Question 4

what are primary colours?

Answer 4

red green blue (RGB, standard)

Question 5

what number does every pixel extend to

Answer 5

every pixel has a 24-bpp depth/ extends by 24-bpp number

Question 6

what does #0A1CF3 mean?

Answer 6

0A for Red, 1C for green, F3 for blue, or the HTML color

Question 7

what is the resolution of an image/display?

Answer 7

the total number of pixels represented

- typically horizontal (width) x vertical (height) number of pixels

Question 8

what is the size of a full HD TV resolution?

Answer 8

1920pixels width, 1080 pixels height

Question 9

today, how much can a digital camera capture?

Answer 9

16M(4000x4000) pixels of 24-bpp RGB (16M) colors

Question 10

what is pixel density?

Answer 10

deifines the physical size of each pixel

- a TV has 100 ppi; an iPhone 5 has 326 ppi

Question 11

what is pixel density (pixel-per-inch or ppi) ?

Answer 11

defines the physical size of each pixel

- a TV has 100 ppi; an iPhone 5 has 326 ppi

Question 12

how does ppi affect the display affect the image/text

Answer 12

the higher the ppi fo a display, the sharper the image/text

Question 13

what is meta-data inside an image file?

Answer 13

the data about the image itself

Question 14

what does the amplitude refer to?

Answer 14

the larger the change in air pressure, the LOUDER the sound

Question 15

what does the frequency refer to?

Answer 15

the faster the change in air pressure, the HIGHER PITCH the sound

Question 16

what are bit-mapped fonts?

Answer 16

early fonts that are fix-sized and not easily scalable

Question 17

what are outline fonts?

Answer 17

they are scalable and are display resolution independent

Question 18

what is a postscript?

Answer 18

a technology invented by Adobe used by laser printers and GUI for printing or displaying outline fonts

Question 19

what benefit does having scalable outline fonts bring?

Answer 19

thanks to scalable outline fonts, texts on our displays and printers are looking much better

Question 20

what are common media formats?

Answer 20

• WAV, MP3 and AAC are audio formats
• GIF, PNG and JPEG are image formats
• WMV, MP4 and AVCHD are video formats

Question 21

give 3 examples of common audio formats

Answer 21

WAV, MP3 and AAC

Question 22

give 3 examples of common image formats

Answer 22

GIF, PNG and JPEG

Question 23

give 3 examples of common video formats

Answer 23

WMV, MP4 and AVCHD

Question 24

how are binary numbers represented?

Answer 24

inside a computer, all data are represented in binary, including numbers. A binary digit (or a bit) consists of two values: 0 and 1
- any number can be represented in binary

Question 25

what is ASCII (American Standard Code for Information Interchange)?

Answer 25

uses 7-bits to encode all standard keyboard characters

Question 26

what is UTF-8 (aka Unicode)?

Answer 26

an extension of ASCII using multi-bytes to encode all international character sets, including ASCII, Chinese, etc.

Question 27

what does plain text mean?

Answer 27

that the character encoding is either ASCII or UTF-8

• HTML files are all plain text files using UTF-8 encoding
• a plain text cannot specify font family, size or bold etc.

Question 28

what does colour-depth (bpp) affect?

Answer 28

the overall texture/details of an image

Question 29

what is a motion picture?

Answer 29

a collection of pictures made to look like a video by capturing and playing images at a fixed number of frames per second.

Question 30

what is data compression?

Answer 30

a technology to “squeeze” data to take up less space

Question 31

what is lossless and lossy data compression?

Answer 31

lossless: preserves all data integrity
lossy: keeps as much “details” as possible

Question 32

what is a common format for lossless data compression?

Answer 32

ZIP

- supported by windows and OS X by default

Question 33

what is apple lossless?

Answer 33

a lossless compressed audio format; PNG and TIFF are a lossless compressed image format

Question 34

explain vector graphics

Answer 34

a vector graphic model is scalable, thus zoomable. Today, many computers models are using 3D vector graphics. Hence, you can rotate the model and view from different angles. They are synthesized by computer internally, not pictures of the real world