"Fixing" might not be the right word. Depends on your goals I imagine. Sure, Ultrapixels is a a marketing buzzword. Even though they're larger than what other phones have been using, they're still not comparable to what's in a full frame camera. And even if they were, all the other parts that make up the camera aren't.
Also, no jpeg image is ever going to be perfectly like the original scene anyway. I wish for a phone camera that outputs raw sensor data files. Then you could open the file in a good raw software package on a good, calibrated system and see what the output looks like before it gets processed all to ****. I mean your graphics system still has to map values to your monitor, but at least that's only one level of interpretation.
I wouldn't wish for phone cameras to ever be as good as a real camera though. Who would want to carry that product around in their pocket all the time? Any of them nowdays is way better than the attempts of just a decade ago, and are perfectly adequate for capturing digital memories to share with our friends and family through the internet.
I personally favor the higher resolution, because I'm often taking shots of hvac equipment data plates, electrical panel breakers, etc. with my goal being the ability to zoom in and read the small print on my monitor back at the office. Don't care about image quality other than that in this case. My S2 is barely adequate in this regard, so the S4's 13mp is sounding good to me. Keeps me from having to lug a real camera to the job site. But when I want to take a better picture at my son's hockey award cereminy or anything else I would hang on a wall, or take good jobsite photos that might end up in our next brochure, I'm taking a better camera, choosing a lense, getting the settings right, etc.
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