Add image filtering feature to ImageHelper [5.3.0-B1]
There is a nice function imagefilter (see http://php.net/manual/en/function.imagefilter.php), that allow to apply various transformations to a given image. They include, but not limited to:
grayscale
inversion
gaussian blur
pixelate
etc.
Why not we allow ImageHelper to benefit from this amazing function.
P.S.
This is improved version of idea, proposed in How about more cool things for Image helper? discussion.
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