Filterpedia is an open source iPad app from Simon Gladman that allows you to explore different Core Image filter testing the filters on an image to help make sure you pick the right one.
Filterpedia provides an interface allowing you to go through different Filters, and also allows you to adjust the different parameters related to those filters.
The different Core Image filters are available along with a number of custom images.
Here is an image from the readme showing Filterpedia in use:
You can find Filterpedia on Github here.
A nice tool for those working with Core Image filters.
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