Digital images

What is a pixel?

• A being of some sort. A bit like a fairy, but not.

• An individual element in a bitmap image

• Either a 1 or a 0

how many bits in a byte?

• 2

• 4

• 8

• 16

How many values can be represented with 1 bit?

• 1

• 2

• 4

• 256

Which best describes the relationship between bits per pixels and colours?

• The number of bits of per pixel is not relevant to the colours

• The number of bits per pixel links directly to how many colours the pixel can represent

• The number of pixels per bit is always 16 (including 0)

How many bits are needed to represent 8 colours?

• 1

• 2

• 3

• 4

• 16

What is the smallest number a byte (8 bit binary sequence) can represent?

• 0

• 1

• 255

• 256

What is the largest number a byte can represent?

• 255

• 256

How many different values (colours) can a byte represent?

• 255

• 256

An 8 bit sequence can represent 256 colours

• True

• False

Bit depth/colour depth refers to the amount of bits per pixel. Which of these is correct?

• The more bits per pixel, the more colours can be represented e.g. 24 bit will represent more than 16 bit

• Colour depth is how deep your paint tin is.