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WOOF_Image :: convolute( Array $matrix, Arguments $attr = array(), Float $offset = 0 )
- WOOF_Image A new image object representing the image with filter applied.
Applies a convolution filter to the image, using the imageconvolution PHP function. This function is lower level than most will need, this class includes a lot the more useful convolutions which call into this method.
A 3×3 array matrix, as passed to imageconvolution.
Arguments $attr = array()
An arguments string or array which supports the following parameters:
- extension – the output extension to use, which also defines the output file type. This can be either “png”, “gif”, “jpeg”, or “jpg”, and if not set, the source image type will be used. default – not set
- alpha – whether to save alpha information for PNGs – default true
- prefix – a prefix to prepend to the cached output file name – default ”
- suffix – a suffix to append to the end of the cached output file name – default ”
- maxlength – the maximum length the output file name (sans-extension) can be before it will be replaced with the original filename followed by an md5 hash of all of the manipulations thus far. default – 72
Note that the maxlength param can be important as chaining multiple filters or resizes together can result in very long file names for the cached images.
Float $offset = 0
A float offset, as passed to imageconvolution