How can I implement live filter on my custom camera renderer?

I'm developing custom camera app currently, and I want to implement live filter on my app. However, it's too difficult to do it.
I did following jobs: overlay transparent image(adjusting with opacity) with imageView on my textureView which renders camera preview. But in fact, this way couldn't work real filter(just adjusting opacity) and also can't save the photo. How can I do? Please help me