(57) A display system is described that allows the rapid display of colour images on screen,
and removes the need for extensive image pre-processing prior to display on screen.
A universal palette is utilised, divided into several sub-palettes, each one containing
data pertaining to shades of different, individual colours. For example, in a palette
with an 8 bit address, 64 shades each of red, green, blue and grey could be stored.
Source colour data are supplied to logic which selects a particular colour component's
data, and this data is then utilised to address the sub-palette containing data pertaining
to shades of that particular colour. For example, red source data are utilised to
address the section of the palette (sub-palette), containing data yielding red colour
shades. Pixels are grouped on screen to form a macro-pixel, each pixel of the macro-pixel
being devoted to one particular colour shade. The eye then acts to merge these colour
pixels on screen to form the composite colour of the macro-pixel. In an alternative
embodiment, all of the source colour data are used to address the palette. Overall
contouring of the image on screen is removed without the need for extensive image
pre-processing, thus allowing the rapid display of guality images on screen.
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