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PDF has a powerful capabilities for colors representation. Zend_Pdf module supports Gray Scale, RGB and CMYK color spaces. Any of them can be used in any place, where Zend_Pdf_Color object is required. Zend_Pdf_Color_GrayScale, Zend_Pdf_Color_Rgb and Zend_Pdf_Color_Cmyk classes provide this functionality:

// $grayLevel (float number). 0.0 (black) - 1.0 (white)
$color1 = new Zend_Pdf_Color_GrayScale($grayLevel);

// $r, $g, $b (float numbers). 0.0 (min intensity) - 1.0 (max intensity)
$color2 = new Zend_Pdf_Color_Rgb($r$g$b);

// $c, $m, $y, $k (float numbers). 0.0 (min intensity) - 1.0 (max intensity)
$color3 = new Zend_Pdf_Color_Cmyk($c$m$y$k);

HTML style colors are also provided with Zend_Pdf_Color_Html class:

= new Zend_Pdf_Color_Html('#3366FF');
$color2 = new Zend_Pdf_Color_Html('silver');
$color3 = new Zend_Pdf_Color_Html('forestgreen');

Zend Framework