lib/prince.php
public function setPDFOutputIntent($pdfOutputIntent, $convertColors = false)
    {
        $this->pdfOutputIntent = $pdfOutputIntent;
        $this->convertColors = $convertColors;
    }
public function setPDFOutputIntent($pdfOutputIntent, $convertColors = false)
    {
        $this->pdfOutputIntent = $pdfOutputIntent;
        $this->convertColors = $convertColors;
    }
$pdfOutputIntent is the ICC profile to be used.