Image Representation

(Fill in the blank to complete the sentence) Tiny squares called ..... are the building blocks of all digital images.

• elements
• squares
• pixars
• pixels

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

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

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

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

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

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

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.

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

How many combinations are there for a '2 bit' colour?

• 8
• 4
• 16
• 32