PHP Manual
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(PHP 3 >= 3.0.8, PHP 4, PHP 5 <= 5.0.4)
The cpdf_setrgbcolor_fill() function sets the current rgb color value to fill a path. Returns TRUE on success or FALSE on failure.
Note: The values are expected to be floating point values between 0.0 and 1.0. (i.e black is (0.0, 0.0, 0.0) and white is (1.0, 1.0, 1.0)).
See also cpdf_setrgbcolor_stroke() and cpdf_setrgbcolor().