(PECL haru >= 0.0.1)
Set the color mask of the image
bool HaruImage::setColorMask ( int $rmin, int $rmax, int $gmin, int $gmax, int $bmin, int $bmax )
Defines the transparent color of the image using the RGB range values. The color within the range is displayed as a transparent color. The color space of the image must be RGB.
Parameters:
rmin
The lower limit of red. Mu