Both solutions add 0.5, the difference is where in the process it happens. | Hacker News

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		yxhuvud 17 hours ago \| parent \| context \| favorite \| on: Should you normalize RGB values by 255 or 256? Both solutions add 0.5, the difference is where in the process it happens.

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account42 1 hour ago [–]

They don't - trunc(result * 255 + 0.5) is just round(result * 255), i.e. error is on average 0 whereas trunc(result * 256) has an average bias of -0.5.

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