It seems POV-Ray has problems reading ppm-files it has generated itself.

- Run the first scene, then use the result in the second scene below.

- With any value of the +fp commandline-switch between 0 and 13 for the 
first scene,  rendering the second scene results is an error:

  File: D:\Ingo\SceneTest\test2.pov  Line: 47
    image_map {

      ppm "test1.ppm" <----ERROR

  Parse Error: Unsupported number of colors (0) in PPM image.


- If the value for +fp is in the range 14-16, an image is rendered but the 
result is garbled.

- Doing the same with png's gives a perfect result.

====================================
// test1.pov
// +w500 +h500 +fp(0-13)(14-16)
#version 3.5;
global_settings {assumed_gamma 1.0}
camera {
  orthographic
  location -z
  look_at 0
  right x*image_width/image_height
  angle 90
}
box {
  <-1,-1,0><1,1,1>
  pigment {
    gradient y
    translate <0,0.5,0>
    scale 2
  }
  finish {ambient 1}
}

=====================================

// test2.pov
// +w500 +h500
#version 3.5;
global_settings {assumed_gamma 1.0}
camera {
  orthographic
  location -z
  look_at 0
  right x*image_width/image_height
  angle 90
}
box {
  <-1,-1,0><1,1,1>
  pigment {
    image_map {
      ppm "test1.ppm"
      interpolate 2
      once
    }
    translate <-0.5,-0.5,0> 
    scale 2
  }
  finish {ambient 1}
} 
======================================

POV-Ray 3.5.icl.win32, Win2000, Athlon 1800+, 1.5 GB

Ingo

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