3.3 Yr 10 Data representation: revision

What is Image Resolution?

• The number of pixels per inch

• how a picture appears on the screen

• How clear a picture is

How many colours do we get from 2 bits

• 2 colours

• 4 colours

• 8 colours

• 24 colours

What does colour depth mean?

• It refers to the number of bits used to represent the colour.

• It refers to how deep the colours go

• it refers to the number of bytes in the colours

What Metadata is stored with an Image File?

• image size, bit depth (colour type), date/time, location, camera type, camera settings

• Sampling rate, bit depth, metadata

• Colour, resolution, who took the picture

The colour of a pixel can be stored as a _______ number

• Unicode

• Hex

• Binary

• ASCII

Each pixel is displayed using a combination of what three colours?

• Blue, green and purple

• Red, grey and white

• Red, green and blue

• White, red and blue

Convert 7A Hexadecimal to Binary.

• 01111010

• 01111000

• 01110100

• 01110010

Convert 11001001 to Denary.

• 199

• 200

• 201

• 202

Convert 9C to Denary.

• 155

• 156

• 157

• 158

The type of compression which removes some of the data from a file in order to reduce its size.

• Lossy

• Lossless