Image Representation
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• Question 1
30 seconds
Q. (Fill in the blank to complete the sentence) Tiny squares called ..... are the building blocks of all digital images.
elements
squares
pixars
pixels
• Question 2
30 seconds
Q. The digital picture shown has been zoomed in and appears now to be very 'blocky'. What is the correct term for this?
Poor resolution
Digitisation
Pixelation
Granularity
• Question 3
30 seconds
Q. Colour depth is the term used to describe .....
N.B. The term 'bit' means a binary digit e.g. '1' or '0'
how many colours have been used to make the picture
how many colours there in each pixel
none of these
the number of bits used to indicate the colour of a single pixel
• Question 4
30 seconds
Q. Which one of the following answers best describe a limitation of this system
Only a few colours can be displayed
The system could not be used for simple computer games
Only 1 colour can be displayed
Only 2 colors can be displayed
• Question 5
30 seconds
Q. How many colours is the bottom picture showing given that it is using 4 bit colour depth?
16 colours
4 colours
256 colours
5 colours
• Question 6
30 seconds
Q. What will happen to the computer file size as the colour depth is increased?
The file size will get smaller
There will be no change in file size
The file size will get bigger
None of these
• Question 7
30 seconds
Q. Resolution means
how fast can the file be sent
how much detail in an image. higher resolution means more image detail
exactly
change picture so it looks wrong
• Question 8
30 seconds
Q. Colour depth means
the difference in brightness between objects or regions

the relationship between picture width and its height.
the overall lightness or darkness
the number of bits used for each colour of a single pixel.
• Question 9
30 seconds
Q. When we have a 'one-bit' colour, which are the only two binary numbers that are possibilities?
00 and 11
000 and 111
0 and 1
0000 and 1111
• Question 10
30 seconds
Q. How many combinations are there for a '2 bit' colour?
8
4
16
32
• Question 11
30 seconds
Q. Which 'bit' image would give the best picture quality?
24
4
8
2
• Question 12
30 seconds
Q. When you 'compress' a file, what happens?