(PECL haru >= 0.0.1)
Set the image mask
bool HaruImage::setMaskImage ( object $mask_image )
Sets the image used as image-mask. It must be 1bit gray-scale color image.
Parameters:
mask_image
A valid HaruImage instance.
Returns:
Returns TRUE
on success.
Exception:
Throws a HaruException on error.
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