To my surprise I just uncovered something myself (using POV-Win 3.1e).
Try rendering this simple thing with and without a comma inbetween the
rgb colors in this checker pattern:

//BEGIN

#version 3.1

global_settings {assumed_gamma 1.0}
// ----------------------------------------
camera {
  location  <0.0, 0.5, -4.0>
  direction 1.5*z
  right     4/3*x
  look_at   <0.0, 0.0,  0.0>
}

sky_sphere {
  pigment {
    gradient y
    color_map { [0.0 color blue 0.6] [1.0 color rgb 1] }
  }
}

light_source {
  0*x // light's position (translated below)
  color rgb 1  // light's color
  translate <-30, 30, -30>
}
// ----------------------------------------
plane { y, -1 pigment {rgb <0.7,0.5,0.3>}}

#declare MyColor1=rgb<1,.5,.25>
#declare MyColor2=rgb<.25,.5,1>

sphere { 0, 1
 pigment {checker rgb 1, rgb 0} //remove comma, add comma to correct
  finish{specular 1} }

//END


Ken wrote:
> 
> Peter Popov wrote:
> >
> > Can anyone please explain why this:
> >
> > density { checker }
> >
> > and this
> >
> > density { checker rgb <1,0,0>, rgb <0,0,0> }
> >
> > give errors, while this:
> >
> > density { checker density { rgb <1,0,0> }, density { rgb <0,0,0> } }
> >
> > works just fine?
> >
> > Here's the whole scene:
> 
> That is the correct behaviour as detailed in the docs. It is the exact
> same syntax necessary to use color list patterns in a texture statement.
> There is one very short 2 line mention of this in the docs that is a bit
> hard to find. The second example you provided is the correct way of
> specifying color list patterns in media.
> 
> P.S. About a month ago I posted a study of this in povray.binaries.images.
> It provides example images and the source code showing how to use the three
> different color list patterns in a media statement.
> 
> --
> Ken Tyler
> 
> mailto://tylereng@pacbell.net

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