Here it is: to Witness the issue of the colored transparency default handling in
POVRAY 3.7 (beta 36)
render the following scene with +UA, one time with the background and another
with the sky_sphere
Depending on the output formats you render to and the application with which you
open the rendered image, here is what happens:


                                 PNG              |               TGA
____________________________________________________________________________
POVwin render window         non colored          |         non colored
under WINXP 32           transparent areas        |      transparent areas
                         with both keywords       |      with both keywords
____________________________________________________________________________
Photoshop                   non colored           |      colored background
                         transparent areas        |      but not sky_sphere
                         with both keywords       |
____________________________________________________________________________
Maya Fsheck              colored background       |      colored background
                         but not sky_sphere       |      but not sky_sphere
____________________________________________________________________________
Blender                  colored background       |      colored background
UV/image editor          but not sky_sphere       |      but not sky_sphere


So it can't be called a blender bug, but actually more of a feature, for which I
would renew a request, to make better exchange between the two softwares. The
same thing for EXR files would also be nice of course!
Thanks for reading.


camera {
  location  <0.0, 0.5, -4.0>
  direction 1.5*z
  right     x*image_width/image_height
  look_at   <0.0, 0.0,  0.0>
}
/*
sky_sphere {
  pigment {
    gradient y
    color_map {
      [0.0 rgbt <0.6,0.7,1.0,1>]
      [0.7 rgbt <0.0,0.1,0.8,1>]
    }
  }
}
*/
background { color rgbt <0.1, 0.3, 0.8, 1> }

light_source {
  <0, 0, 0>            // light's position (translated below)
  color rgb <1, 1, 1>  // light's color
  translate <-30, 30, -30>
}

// ----------------------------------------

plane {
  y, -1
  pigment { color rgb <0.7,0.5,0.3> }
}

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