(deprecated) tone mapping

Please note that this module is deprecated from darktable 3.4 and should no longer be used for new edits. Please use the tone equalizer module instead.

Compress the tonal range of HDR images so that they fit into the limits of an LDR image, using Durand’s 2002 algorithm.

The underlying algorithm uses a bilateral filter to decompose an image into a coarse base layer and a detail layer. The contrast of the base layer is compressed, while the detail layer is preserved, then both layers are re-combined.

🔗module controls

contrast compression
The contrast compression level of the base layer. A higher compression will make the image fit a lower dynamic range.
spatial extent
The spatial extent of the bilateral filter. Lower values cause the contrast compression to have stronger effects on image details.