Comment 2 for bug 1649122

Thank you for your explanation. I am not quite with you, though. Sure, there is nothing to weight and mix in the deghosted area with pixels from only one exposure, but nevertheless brightness and contrast of this area follow nicely when I increase exposure-mu. Perhaps this adaptation mechanism at the border ceases to work when the exposure is too far off. There might even be a built-in limit to prevent side-effects like increased noise.

Contrary to my former statement, there is a symmetrical effect when deghosting a bright area with pixels from the darkest exposure. This can be seen in the new combined testcase tc3:

$ enfuse --saturation-weight=0 --exposure-mu=0.0 -o 161022_tc3_mu00.tif 161022_tc3_70??.tif
$ enfuse --saturation-weight=0 --exposure-mu=0.2 -o 161022_tc3_mu02.tif 161022_tc3_70??.tif
$ enfuse --saturation-weight=0 --exposure-mu=0.5 -o 161022_tc3_mu05.tif 161022_tc3_70??.tif
$ enfuse --saturation-weight=0 --exposure-mu=0.8 -o 161022_tc3_mu08.tif 161022_tc3_70??.tif
$ enfuse --saturation-weight=0 --exposure-mu=1.0 -o 161022_tc3_mu10.tif 161022_tc3_70??.tif