A Raw converter for Mac OS X, supporting almost all available digital Raw formats made for photographers by a photographer-software engineer with unmeasurable amount of help and tutoring from my friend, professional photographer Iliah Borg.

Think of RPP as of a development machine in terms of film photography - first you have to develop your roll right, then do whatever you want with it. So this is NOT a full featured photo processing package, you will need Photoshop or some other tool to apply sharpness, cropping and so on, but you may use RPP for some carefully chosen operations:

4-channel white balance

This is probably the most important operation in Raw processing and it has to be applied at very early stages. RPP supports various ways of working with white balance - automatic detection, “as shot” (taken from camera), custom white balance from neutral areas and color tone adjustments on “cold - warm” scale.

Exposure compensation

Another very sensitive step, should use high precision math to preserve shadows and highlights and it is almost impossible to make it properly during post-processing in Photoshop.

Saturation

Very tricky operation, because it has to account for specifics in human's color perception and traditionally it's implemented with very crude methods. I'm trying to keep up with Color Science and using a lot more sophisticated approach.

Brightness and contrast

These represent my and Iliah's Borg attempts to create tone curve adjustments based on actual film density measurements in different development modes. After all you finally should be able to obtain that dearly-looking film-like tonality in your pictures.

Interpolation

RPP supports 3 methods at the moment. AHD, VNG and Half - all modified versions of Dave Coffin's implementations in dcraw. Actually Half is not interpolation - this is a half resolution recombination when four single-colored pixels (RGBG) combined to one RGB, very fast, color accurate, but at price of lost resolution.