A couple of weeks ago, we at Igalia got a number of plugins published in the Nokia Store: Enlarge & Shrink, Gallery Tilt Shift plugin, and Facerecognition Reset Plugin. We had them ready for some time already, but still it was very difficult to pass the Nokia Store Quality Assurance: there is a list of valid directories where a Debian package can install its files, and they had missed the ones for Gallery plugins. So, in order to finally get over that problem, my friend and colleague Andrés had to "fight" with the Store QA people quite a bit: don't forget to thank him for this!
Although I developed only the Tilt Shift one, I will briefly introduce you the other two as well
The Enlarge & Shrink plugin is an add-on to the built-in Gallery application. You can use it to apply a radial distortion to a picture, so they look like enlarge and shrink effects (also known as punch or pinch).
The Face Recognition Reset plugin also behaves as an add-on, but doesn't work on individual images. Instead, it forces the deletion or un/protection of the facerecognition database, something that you might need if for whatever reason the database gets corrupted.
And finally, the Tilt Shift plugin lets you make a picture look as a miniature, by applying the following transformations:
- Blurring the image using a Gaussian Blur filter
- Keep an area of the image focused (either vertically or horizontally)
- Combine both parts of the image using a Gaussian filter (so the focus is lost gradually from the focused area to the rest of the image)
- Increase the saturation, so the colors seems those of a miniature
There is a problem, however. Gallery uses Quill, and Quill was designed to use tiles in order to minimize the memory footprint and work happily in mobile devices. That tiling mechanism finally proved to be less flexible than it should, so for those edit operations where you can't rely only on the local information in the tile... things won't work.
You can still use these plugins for small images. Gallery doesn't do tiling on images of 512x512px or smaller, so that is what is currently supported. Another option is writing a complete new application to get this miniature effect (either using Quill with a different tiling configuration or not using it at all). You can check the full explanation at the GitHub page of the project.
Take a look at all applications published by Igalia at the Nokia Store.