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