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- Add DNG writting mode support using Adobe DNG sdk
- Libraw 0.13.0 features to support :
1) Green channel local averaging. All interpolation methods, but may conflict with green_matching option, so it is safer to use only one green averaging.
int cfa_green; Boolean, default is 0 (off)
float green_threshold; - Sensitivity of method (green is averaged if difference less than this value in percent). Usable range between 0.01 and 0.1, commonly 0.03
This filtering is applied *before* demosaic.
The problem is simple: on some cameras (for example, Olympus E-xxx) two green channels are different (in sensitivity and, may be, in spectral response).
As a result, it produces 'maze artifacts' on flat surfaces (like sky).
The solution is simple: if two channels are *slightly* different in some local area, it is better to equalize it.
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