produce fireflies

[radiance]

Hi guys,

If you render an image at 4x the size, eg you will have 16x as much pixels (4x4),
you will, with 1 pixel sample, have the same noise level as 16 pixelsamples in the original resolution.

So it won't take 16x as long to render.
Rendertime is the same, you just need to render 16x less pixelsamples, then downscale and you'll have the same noise level, but a much nicer result.

Radiance

[nickliang]

This is also a method, But it is not the most popular method.
Perhaps the early release of b2.3 is the best solution.