half size option for dcraw_emu
The "-h" option for dcraw_emu, which sets the half_size flag on imgdata.params, seems to only work for certain files or camera models -- is this by design? In particular, at https://github.com/LibRaw/LibRaw/blob/master/src/libraw_cxx.cpp#L3033-L3037, it looks like the half_size flag is only obeyed if filters is nonzero. I am not familiar enough with the code to understand when or how it gets set to something nonzero, so I'm hoping that someone here can help shed some light.
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