You're developing a killer module for the Object Collection, and you
discover an oversight in one of your macros.  You repair the oversight,
but it needs testing, so you write a test scene.  The colors are not right.

You rack your brain over the macro.  You stare at #debug output and GIMP
samples.  You convert back and forth between linear and sRGB.  You
compare the macro with a successful proof-of-concept you wrote two
months earlier.  You start to wonder if you have some grave
misunderstanding of how POV-Ray works.  You divide by the finish diffuse
to see if that's interfering, but the numbers still don't match up.  You
run a case using just gray scales, and discover that the diffuse value
/couldn't/ be the problem.  Everything checks out in the SDL, but the
image is still wrong!

After several hours of this, you discover that the bug is in test scene
itself!

Oy, vey.

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