It's nice to see more awareness of HDR (high dynamic range) photography. The iPhone has a built-in HDR mode, and more and more software is supporting the combining of images shot at different ƒ stops, combined to create an image that captures more shadow detail without blowing out the highlights.
HDR Darkroom Pro for OS X is on sale at a rather dramatic introductory price of US $19.99. It's a 75% off savings. Most HDR apps hover around $100 so this app qualifies as a good bargain while it is on sale.
To use the app, you import 3 or more images show at different exposure settings. HDR Pro Darkroom will align the images, and produce a tone-mapped im