can anyone tell me why this does not work: (the #declare line gets the
yellow overlay)

#declare SourceImage = "F:\apps\POV-Ray for Windows
v3.6\hfields\HF101SizeMaters44.png";

height_field {
  png SourceImage
  translate -0.5
  scale <52,12,52>
  pigment{color rgb <1,1,0> }
}

but this does:

height_field {
  png "F:\apps\POV-Ray for Windows v3.6\hfields\HF101SizeMaters44.png"

  translate -0.5
  scale <52,12,52>
  pigment{color rgb <1,1,0> }
}

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