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Colin,
HDR is the process of adding and subtracting to the pixels in a very non linear way - so its not scientifically accurate !
The HDR used in some of the award winning images and in some imaging processes is much more complicated than that - its selectively operating on the structures, chroma and intensities alike, again in a completely non linear way, but once you start blending new channels such as Ha into R and L - you must also completely change the underlying colour balance to achieve white balance stars and avoid the typical magenta cast that results - and so you have destroyed the original colour - from a scientific perspective.
Rally
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