epslatex problems

[Valentina B. <val...@da...>]

With the following settings:

set term epslatex input blacktext colour

I get the following error messages:

    \GenericError{(gnuplot) \space\space\space\@spaces}{%
      Package color not loaded in conjunction with
      terminal option `colourtext'%
    }{See the gnuplot documentation for explanation.%
    }{Either use 'blacktext' in gnuplot or load the package
      color.sty in LaTeX.}%

and

    \GenericError{(gnuplot) \space\space\space\@spaces}{%
      Package graphicx or graphics not loaded%
    }{See the gnuplot documentation for explanation.%
    }{The gnuplot epslatex terminal needs graphicx.sty or graphics.sty.}%

Why? I am using the "input" mode, so I should not have to specify any 
package for latex....I am surely missing something....

Ciao
Valentina