This program has been created by a professional landscape photographer for other photographers. It can calculate HDR exposure difference, noise reduction, and multi-pass up sampling, common techniques used by the pros to produce professional-caliber photographs.
High Dynamic Range (HDR) Photography is becoming increasingly popular. Exposure bracketing, a technique frequently employed by the HDR Photographer, involves varying the shutter speed (and less commonly, aperture and ISO) in successive exposures of the same scene. This program is especially useful because it calculates the difference in exposure values (E.V. or stops) between two such captures, even if the ISO, aperture, and shutter speeds wildly differ between exposures. This value may then be utilized to either verify or supplant that calculated by HDR programs such as Photomatix or HDR Efex Pro at the start of the HDR workflow.
This app retails for $0.99 and you can download it here
But that’s not all this program does. It can also calculate how much you need to resize (downsample) a particular image to drastically reduce the amount of random photographic noise by a specified number of stops. All you need to do is specify the desired number of stops of noise reduction, and the program calculates the resized image’s linear dimensions (length/width) as a percentage of the original image’s.
To those of you who routinely upsample your images (perhaps to display in a gallery or on a billboard), the Multi-Pass Upsampling calculator of program will prove especially useful. It can calculate the number of passes necessary to enlarge an image in small, arbitrary, user-specified increments until the final enlarged size is attained. Upsizing an image in multiple, iterative steps rather than a single one yields higher micro-contrast and greater detail than would be accomplished through more traditional means such as single-pass bicubic upsampling. In fact, the results of this technique are almost on par with those achieved by resizing using fractal resizing.