Apr 7, 2014
Jojo as of 1.3.3 supports php imagefilter both on uploaded images and on request via url.
Filters can be applied to any uploaded image by including filters in the options for that upload field (using Edit Fielddata)
Add filters to the option, one per line, in the order they are to be executed, each filter comma separated with any arguments.
This permanently alters the uploaded image.
Filters to be used are added through Admin > Options > Images: Image Filters
Each filter has a (url-firendly) name (a-z, lowercase, no spaces): followed by a semicolon-separated list of the filters to be applied when the name is used, in order of execution.
Any image called through Jojo's image handler can then be filtered by adding the filter name after the size
Currently only resized images (i.e. not default) can be filtered.
Jpgs are now also auto sharpened after resizing. The amount of sharpening can be controlled through the Image Sharpening Option.
For a list of available filters and their arguments see
Jojo also includes a custom filter IMG_FILTER_DUOTONE which works similarly to grayscale + colorise, but preserves luminosity.