Following
this exercise where a script was used to build a synthetic DNG (non-demosaiced) RAW file, I have taken 2 shots 6EV apart from this high DR scene:
http://guillermoluijk.com/misc/rawhdr.jpgThe RAW histogram of the composite DNG shows 12-13 stops of DR:
http://guillermoluijk.com/misc/hdr.gifThe resulting DNG is built taking all possible photosite data from the most exposed capture. Saturated (95%) photosites are taken from the lower exposure shot (ETTR'ed for the scene's highlights).
Each photosite level is considered individually, so many pixels have neighbours from the other RAW file according to the Bayer pattern. A good alignment of the shots makes it possible that demosaicing with data from two different RAW files (once the higher exposure RAW data has been corrected down) provides noise-free and issue-free textures.
This fusion map displays in white which photosites were taken from the lower exposure shot and viceversa for the black ones:
http://guillermoluijk.com/misc/mapafusion.pnghttp://guillermoluijk.com/misc/mapafusion.jpgThat is why I consider this a very radical HDR composite, altogether with the large 6EV exposure gap.
Comparison of deep shadows nosise HDR DNG vs RAW file which prevented highlight clipping:
http://guillermoluijk.com/misc/hdrsombras.jpgWanna play with the HDR DNG:
http://www.guillermoluijk.com/misc/hdr.dngRegards
