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@tritical: Regarding interpolation, the ramp example isn't that relevant as the differences between the two methods would be negligible when interpolating between roughly similar brightness levels.
Where this effect shows up strongest is when interpolating between a bright pixel (or several of them) and a much darker one (or several). The effect is that small bright details (e.g. stars in the night sky) become much dimmer and less visible than they should, while small dark details (e.g. speckles of dirt on a white sheet) become more obvious than they should.
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