OpalPlanet wrote:
> Is there any way to take the color of a certain area of an image (jpeg, png,
> etc.) and find out its values in rgb?

As an alternative to Warp's suggestion, you may want to try using
eval_pigment. It doesn't require you to make the pigment into a function
beforehand, but you must still pre-declare it. Here's an example:

#include "functions.inc" // Required. Include this or transforms.inc

#declare img=     // our image to test
  pigment{
   image_map{
    //sys"fish.bmp"
    tga"gold_nugget.tga"
   }
  translate -(x+y)/2   // center the image
  scale<1.33,1,1>*10   // scale the centered image
}

#declare test_color=
  eval_pigment(
   img,     // the pigment we are testing
   <0,0,0>  // The point in 3d space to test at.
            // It will test AFTER the above transformations
  );

sphere{0,.5  // a sphere to show tested color
  pigment{
   test_color                                       // this is legal
   //rgb test_color                                 // so is this
   //rgb <test_color.x, test_color.y, test_color.z> // this also works
  }
  finish{ambient 1}
}

plane{z,.5 // plane to show entire pigment
  pigment{img}
  finish{ambient 1}
}

I hope this is helpful~

~Sam

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