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Old 12 September 2015, 21:38   #1
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Join Date: Sep 2011
Location: Cardiff, UK
Posts: 200
Query about Extra Half-Brite (EHB)

So OCS/ECS Amigas had this mode which on principle takes the 32 colours of the first five bitplanes and with the extra bits of the sixth bitplane, halves the brightness if the bit is set.

What I've always wondered about is if the halved brightnesses were tied into the 4096 colours of the first 32, or unique accurate shades in their own right. What I mean is, say if a colour register with R01 G02 B03 is used in an image, would the EHB equivalent be R0.5, G01 and B1.5 or would it be the closest colours to be compatible with the 16 levels of RGB that this chipset could produce?
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