169 votes
Accepted

What algorithm did Microsoft use to dither colour in early versions of Windows?

Basically, Windows used the basic 16-color CGA palette, which included 4 shades of monochrome, and 12 basic colors (two each of red, green, blue, yellow, purple, and teal), which later formed the ...
phyrfox's user avatar
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43 votes

What algorithm did Microsoft use to dither colour in early versions of Windows?

The other answers already mention that the algorithm is based on an 8×8 Bayer matrix. But that’s not the whole story. Most how-to guides to colour Bayer dithering, like the one cited in @phyrfox’s ...
user3840170's user avatar
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39 votes

What algorithm did Microsoft use to dither colour in early versions of Windows?

As @phyrfox mentions, it is ordered dithering using a Bayer matrix. I recently was trying to find a 16×16 Bayer matrix (256 discrete values) but all the ones I could find were 8×8 max, so I derived ...
Tim R.'s user avatar
  • 507
19 votes

What algorithm did Microsoft use to dither colour in early versions of Windows?

As I recall, the Windows code did have some special cases. If you asked for #C0C0C0 you would of course get solid #C0C0C0. This was a special case; if you asked for #BFBFBF then you would get a ...
Neil's user avatar
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11 votes
Accepted

How does Apple ][gs hardware dithering work?

The Apple IIgs Hardware reference explains it: In 640-pixel mode, color selection is more complicated. The 640 pixels in each horizontal line occupy 160 adjacent bytes of memory, each byte ...
Kelvin Sherlock's user avatar
10 votes

What was the dithering algorithm used in Sierra and LucasArts games?

SCI games support dithering using any pair of EGA colours; each individual scene can use up to four palettes of forty colours (one at a time). When dithering, colours are alternated horizontally and ...
Stephen Kitt's user avatar
9 votes
Accepted

Usage of Windows default 20-color palette

Those were used by the default desktop color scheme, I think starting in Windows 3.1 (it might have debuted in 3.0). The “Sky Blue” color was the default Title Bar color; it’s unmistakable. The ...
Euro Micelli's user avatar
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5 votes

Best 4-color palette for dithering arbitrary images

This seems nominally Retrocomputing, because there were plenty of computers that only offered a 4-color palette - or even just 2-color - at times. However, without reference to an actual production ...
manassehkatz-Moving 2 Codidact's user avatar
1 vote

What was the dithering algorithm used in Sierra and LucasArts games?

Preface, this is not an authorative answer, just from rough memory. As far as I remember, they used different techniques. For most parts it was a modified colour scheme: All Rendering was based on ...
Raffzahn's user avatar
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