Data Representation - Images

Most graphic formats create many colours from:

• Red, green, blue.
• Red, pink, yellow.
• Red, white, blue.
• Black, white, green.

A bitmap image is made up of

• Pixels
• Colours
• Sounds
• Samples
• Characters

Increasing the colour depth means…

• A bigger range of colours can be used for each pixel
• More pixels are in the image.
• More colours are in the image.
• Darker colours

How many colours can be used for each pixel if the colour depth is 4 bit?

• 4 colours
• 5 colours
• 15 colours
• 16 colours

How many colours can be used for each pixel if the colour depth is 8 bit?

• 8 colours
• 9 colours
• 255 colours
• 256 colours

Additional Information about the image file is stored as

• Metadata
• Properties
• File summary
• Pixels

The number of pixels per inch in an image is known as the

• Dimensions
• Colour depth
• Resolution
• Megapixels

The binary code for each pixel is used to determine

• Which colour will be displayed
• How big the image is
• What shape the image is
• How many pixels will be in the image

How could you reduce the file size of an image?

• Reduce the numbr of colours used per pixel (colour depth)
• Reduce the dimensions of the image.
• Compress the file using a lossy compression file type.
• All of these

Define the term "Resolution"

• The number of bits used per pixel (BPP).
• The number of colours used in an image.
• The number of pixels per inch (PPI).
• The total number of pixels in an image.