comp sci chapter one

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15 Terms

1
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how many bits are in a byte

8

2
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what does resolution mean

number of pixels per inch

3
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what is colour depth

the number of colours displayed in an image

4
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more colours means what?

There will be more bits per pixel

5
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how does a ADC work

we sample the analog sound, measure and record the amplitude, which is then stored as a binary number, After a certain time interval, this is repeated 

6
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 what happens when the sample rate is increased 

more binary numbers need to be stored and the file size is larger. But it provides better quality 

7
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what happens when sample rate is decreased 

the file size is smaller bc less bits stored, sound quality decreases 

8
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what's lossy compression 

when a file is decompressed it's not identical to the original, some data has been lost

9
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what's lossless compression

when a file is decompressed, it's identical to the original.

10
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when is lossy compression used 

with sound or image files

11
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when is lossless compression used 

for text files, when all data is essential and cannot be lost 

12
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what are vector graphics made up of 

geographical shapes

13
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what are bitmaps made up of 

pixels

14
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which is more realistic: bitmaps or vector graphics?

bitmaps- as vector graphics have a limit on the number of geometrical shapes 

15
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