I’ve been meaning to write something up about doing this process using F/OSS tools, but haven’t gotten around to it just yet. It’s an old idea, and is best illustrated in this post from about 8 years ago from Guillermo Luijk.
The basic idea is to shoot two exposures for a scene. One properly exposed, and another about +4EV.
The two images are then merged, similar to an HDR workflow, but in this case the exposure of the over-exposed image is brought back down -4EV to match the original exposure. The difference is that the now shadow detail came from the upper levels of the exposure and will contain less noise.
Guillermo’s examples include these two shots:
He then blends the two exposures, but decreases the brighter one by -4EV to match the original exposure levels. However, the shadow details are superb:
I’ll probably write a post about doing this shortly using luminosity masks for the blending.
Has anyone else had a chance to try this and have some thoughts/results/workflows to add to the conversation?