OCR GCSE - Bitmap images

What is a pixel?

• A small dot of colour

• 1 or 0

• Colours on a screen

• The number of bits used to represent the colour

A bitmap image is made up of

• Pixels

• Colours

• Sounds

• Samples

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

Reducing the amount of colours in the image will

• Reduce the quality of the image.
• Reduce the amount of binary needed for each pixel.
• Make the file size larger
• Remove pixels from the image.

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

Increasing the resolution of an image means that

• More pixels will be used to make up the image
• More colours will be used to make up the image
• The image size will be bigger

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