3.3.6 Representing images (AQA GCSE Comp Sci)

A bitmap image is:

• An image made up of pixels

• An image made up of vectors

• A type of audio file

• A type of text file

A pixel is:

• A unit of digital image

• A type of printer

• A kind of software

• A programming language

Image size in the context of a bitmap refers to:

• The number of pixels in the image, typically measured in width x height (e.g., 800x600 pixels)

• The file size of the image in kilobytes or megabytes

• The number of colors used in the image

• The physical dimensions of the image when printed

Colour depth in the context of a bitmap refers to:

• The number of bits used to represent the colour of a single pixel

• The number of pixels in the image

• The size of the image in kilobytes

• The resolution of the image

If a bitmap has a colour depth of 1 bit, how many different colours can each pixel display?

• 2

• 4

• 8

• 16

If a bitmap has a colour depth of 8 bits, how many different colours can each pixel display?

• 256

• 128

• 16

• 512

How many different colours can a 24-bit colour depth represent?

• 16,777,216

• 65,536

• 256,000

• 1,048,576

Increasing the number of pixels in a bitmap image affects its file size in which way?

• It increases the file size

• It decreases the file size

• It does not affect the file size

• It makes the file size unpredictable

Increasing the colour depth of a bitmap image affects its file size in which of the following ways?

• It increases the file size

• It decreases the file size

• It does not affect the file size

• It makes the file size unpredictable

If you increase the width and height of an image from 10x10 pixels to 20x20 pixels (with the same colour depth), how would its file size change?

• It would become 2 times larger

• It would become 4 times larger

• It would become 8 times larger

• It would stay the same