 The original ZX Spectrum has a screen resolution of 256×192 pixels.Colour information is overlaid onto this as a grid of 8×8 pixel regions known as attribute blocks; within each attribute block, only two colours may be used out of a palette of 8 (black, blue, red, magenta, green, cyan, yellow and white).Additionally, the entire attribute block may be designated as 'bright', resulting in a total of 15 possible colours (because both bright and dark black is the same colour #000000).