Allow User to choose size of randomly-created images

[bamojam]

[glentregoning]

As a suggestion, perhaps we could make this at sizes that equate to the megapixel ratings of the cameras on the various devices (i.e 4, 4S, 5C, 5S)?

Although it would also be good to make smaller images too so number of images can be stress tested

[bamojam]

Hmm, it seems more than megapixels is at play. http://www.anandtech.com/show/7329/some-thoughts-about-the-iphone-5s-camera-improvements has the average image size having surprisingly little variation from the 4 through the 5S.

The app currently does sizes randomly from 2.1-2.5mb.

I think I'll also include a much smaller size (0.5mb?) for the case when high quantity is needed regardless of realistic size or not.