$color = new \ImagickPixel('rgba(90%, 20%, 20%, 0.75)');

        echo "Alpha value is " . $color->getColorValue(\Imagick::COLOR_ALPHA) . "
";
        echo "" . "
";
        echo "Red value is " . $color->getColorValue(\Imagick::COLOR_RED) . "
";
        echo "Green value is " . $color->getColorValue(\Imagick::COLOR_GREEN) . "
";
        echo "Blue value is " . $color->getColorValue(\Imagick::COLOR_BLUE) . "
";
        echo "" . "
";
        echo "Cyan value is " . $color->getColorValue(\Imagick::COLOR_CYAN) . "
";
        echo "Magenta value is " . $color->getColorValue(\Imagick::COLOR_MAGENTA) . "
";
        echo "Yellow value is " . $color->getColorValue(\Imagick::COLOR_YELLOW) . "
";
        echo "Black value is " . $color->getColorValue(\Imagick::COLOR_BLACK) . "
";