The application has been designed and developed for the latest touch screen smartphones. Nokia N8 and iPhone 4 are its primary target devices, but it is also compatible with all other Symbian^3 devices: Nokia E7, Nokia C7, Nokia C6-01, etc, together with previous generation N97 and N97 Mini.
HDR Photo Camera works by capturing three successive frames at different exposure levels (bracketing). Then it uses the exposure fusion technique to select relevant elements and combine these frames resulting in an HDR image.
"The idea of using several exposures to fix a too-extreme range of luminance was pioneered as early as the 1850s by Gustave Le Gray to render seascapes showing both the sky and the sea. Such rendering was impossible at the time using standard techniques, the luminosity range being too extreme. Le Gray used one negative for the sky, and another one with a longer exposure for the sea, and combined the two in a single picture in positive."