I normally shoot with a couple of Nikon dSLRs, but occasionally take the odd snap with my iphone6. No matter how I edit, either on the phone or by emailing the image and editing in Photoshop CS6 with Nik plugins, I seem to have a lot of noise and poor image sharpness/definition, at least when compared to other images I see posted on the net. Certainly the quality would not be good enough for a 10"x8" print, or on a PC screen. What trick am I missing?
A couple of days ago I took the attached image with my iphone as I did not have my dSLR with me. Image taken in to the light of a low setting sun, using IPhone 6 and "RAW" by 500px app, exported at full size by email in to PS CS6, increased from 72dpi to 300dpi and processed with additional help from NIK plug-ins, Silver Efex in particular. I tried removing noise with NIK Dfine2. results are ok at small scale, but when I tried to zoom in to view at actual pixel size (- see the close-up of the central part of the image), I noticed that a lot of the noise is in a regular square grid form over the entire image.... which is surely not a result of my editing effects, or is it?
Does anyone have suggestions as to what this effect is caused by, and how I can eliminate it please?