title: how do I substitute one colour for another, in every object, of an eps file?
body: <p>I have a vector image that I need to edit and I have inkscape.
  What I want to do is to substitute one set of coulours of the palette by another. For example, my image has a palette with several tones of orange, green and blue. What do I have to do if I want to substitute the orange part of the palette with another color?</p>