Representing Images (OCR GCSE Computer Science): Flashcards

Smallest unit of an image, representing one colour

Number of bits used to represent each pixel

$2$ colours

$4$ colours

$16$ colours

$256$ colours

Number of pixels in an image

Dots per inch (DPI)

Additional information stored about the image

Higher image quality but larger file size

Lower image quality but smaller file size

Size $=$ Resolution $×$ Colour Depth (in bits)

$1$ byte $= 8$ bits

$1$ MB $= 1{,}000{,}000$ bytes