Well, here's how I've been using it for the past several years:

//  Sized image Map - 1 unit thick box
#declare XSize = 40;
#declare ImageMap = pigment {image_map {jpeg "TestGear.jpg" once} };
#declare Resolution = max_extent (ImageMap) + <0, 0, 1>;


#declare ImageMappedBox =
 box {0, 1
  texture {
   pigment {ImageMap}
  }
  translate <-0.5, -0.5, -0.5>
  scale Resolution*(1/Resolution.x)*XSize
  //translate y*(Resolution.y / Resolution.x)*XSize/2
 }


Note that there are only  x and y non-zero-values to the max_extent, so that's
what the addition of the vector in defining Resolution is for (to avoid warnings
when using scale.

That last translation is to move the box from origin-centered to having it's
base at y=0.

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