More tinkering around with the light/radiosity/focal blur.

A very simple image, with the following light.

light_source {
    <-0.5, 4.5, -0.5>
    color 0.1
    area_light <1, 0, 0>, <0, 0, 1>, 2, 2
    adaptive 1
    jitter
    fade_distance 12.0
    fade_power 3.0
    looks_like { sphere { <0.5,0,0.5>,0.5 } texture { pigment { color rgb
1.0 } finish { ambient 1.0 reflection 0.6 } } }
  }

Note the speckled zones around the shadows? What causes this and how can it
be eliminated? It shows up on the TGA as well as this JPG.

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