> this sounds like a bug I noticed a while ago: with using alpha-channel 
the color-clipping seems to be done entirely differently.  However, 
> this bug seems to be solved in POV-Ray 3.6.1

on second thought... the mosaic-preview looks ok, but the final render 
doesn't :(

example-scene:

    camera {location -z look_at 0}
    light_source {<500,500,-500> rgb 1}
    sphere {0,.2 pigment {red 1} finish {specular 1 diffuse 1}}


ini-settings:

    +sp8 +ep4 +ua


Tested in MegaPOV 1.1 and POV-Ray 3.6.1, under Windows XP SP1, Athlon XP 
2500+ 1GB RAM


cu!
-- 
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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