I have a Samsung Galaxy S4. Is there a way in Android or an app that can take raw photos? I.e. have the raw camera data to process in a program like Photoshop. I am using Android 4.2.2.
NO, there is no public API that allows developers to create camera apps that takes raw photos. Based on what I've read in dpreview.com, implementation would have to be at driver level, and specific to each device.
Also, raw files taken by camera phones would also look nasty.
Now it's possible to take raw photos on some Lollipop devices, like Nexus 6 and 5, among others.
Why is this possible? Because Lollipop includes a lot of new APIs to work with the camera (Camera APIs v2), so any developer today can use them and take the most of the device camera.
Note: Raw capture only works on paid version.