My previous favorite two-exposure HDR photo app, TrueHDR, gave me a bit of frustration in Germany. The output wasn’t saved at full resolution, and the grain/noise was a lot more noticeable on the iPhone 4’s retina display.So I’m trying out Pro HDR ($1.99). Works the same way (take one bright and one dark exposure, merge them), but claims to save full resolution (3MP or 5MP), and has some nice sliders to adjust saturation, warmth, etc. before you save (the HDR process sometimes does funky things to color). Just did this test shot on my back porch. So far, so good. The sky and the flower pots are both exposed pretty well. I think I’ve found something that improves upon TrueHDR, and another tool in my iPhone photography arsenal.