Hard edge on tone mapping module
I'm not really sure if it's a bug. I'm often using the tone mapping module on non HDR photos, it can gives great results in no time.
There is one problem though, it's high contrast lines. It often gives a hard edge, thin black line that is not that noticeable at full size, but much more when looking carefully.
I don't know if this is a result to expect when using the plugin this way, it seems a bit weird to me. I don't have this result at all if I'm using the "mean" (or average, I'm not sure of the translation in english) merge instead of the default one. But of course the output is not really the same.
I'm attaching an example, a crop on a photo to let you see this line, and the RAW, as well as the XMP.