Key Words: Graphics, Characters and Sound

Image made of pixels.

• bitmap

• pixel

• resolution

• metadata

The number of bits used to store the colour of each pixel in an image file.

• colour depth

• sample size

• sampling frequency or rate

• bit rate

Extra data stored in an image file so that the image can be recreated on screen.

• pixel

• bitmap

• metadata

• sample size

A single coloured square block in an image called a picture element.

• Unicode

• pixel

• bitmap

• character set

The concentration of pixels in an image.

• colour depth

• bit rate

• resolution

• sample size

A character set that uses 7 bits to represent each character and has a total of 128 characters that can be represented.

• extended ASCII

• ASCII

• Unicode

• character set

The set of characters that a computer can recognise and print.

• character set

• set of characters

• character

• carrot

A character set that uses 8 bits to represent each character and has a total of 256 characters that can be represented.

• ASCII

• Unicode

• sample set

• extended ASCII

A character set that uses 16 bits to represent each character. 65,536 characters can be represented.

• ASCII

• Extended ASCII

• sample set

• Unicode

Samples are made at regular intervals and joined together to make this new digital wave.

• approximated sound wave

• analogue sound wave

• give us a wave

• digital wave