Comparison To EGA
Although the IBM PC Enhanced Graphics Adapter (EGA) standard offers a fixed 64 color space, it only allows 16 simultaneous colors (16 out of 64), and then only in the relatively slow and barely accelerated high-res (640x350) mode. Hi-res also required a dedicated EGA monitor - the lower resolutions (320x200 + 640x200, same as CGA) use 16 fixed colours, identical to those of the CGA master palette, for compatibility with digitally connected older monitors.
EHB exceeds this by allowing 32 colors out of 4096 plus their half-bright counterparts (32 + 32 out of 4096), at 320x200 thru 360x576, on a standard composite-video monitor. It can also display at 640x400 thru 720x576 using any 16 colours out of 4096 on a composite (i.e. analogue CGA-spec) monitor with the same Agnus/Copper graphics acceleration facilities as in low res.
Read more about this topic: Amiga Halfbrite Mode
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