hints & tips // 2008.09.18 08:42:12 [hh]

"Raw Photo Processor": kostenlose RAW-Konvertierungssoftware am Mac

Mit der Mac-only Software "Raw Photo Processor" (kurz RPP) von Andrey Tverdokhleb existiert eine kostenlose Alternative zu teuren RAW-Workflow-Tools am Mac wie etwa "DxO Optics Pro", Apples "Aperture" oder Adobes "Lightroom". Für viele könnte dieses Tool - das auch schon aktuellste Modelle wie Panasonics LX3 oder Nikons D90 unterstüzt - bereits vollauf genügen.

So beschreibt Tverdokhleb auf seiner Web-Site die Features:

"A Raw converter for Mac OS X (10.4 or 10.5 only), supporting almost all available digital Raw formats made for photographers by a photographer-software engineer.

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.
• Highlights recovery - a simple tool to restore clipped channels if present (f.e. the "pink sky" problem).
• Local Contrast - a tool based on HiRaLoAm technique by Dan Margulis to make your images more contrast  without heavy impact on overall tonality like with  regular contrast.
• Monochrome mode - a scientific way to produce black&white, sepia and other kinds of monochrome pictures based on measurements of actual photo papers made by Iliah Borg.
• Calibrated histogram with eV, L*  and Adams Zone system scales."

Weitere Informationen: www.raw-photo-processor.com

 

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