Same Android project on how to implement an image filter in C using the Android NDK.
Use the slider to select a brightness value that will be bounded from 1-10 and then click on the button to apply the brightness filter.
I wrote about this at: http://ruckus.tumblr.com/post/18055652108/writing-a-basic-image-filter-in-android-using-ndk
Screenshots from before and after:
