global tonemap (deprecated)
Please note that this module is deprecated in darktable 3.4 and should no longer be used for new edits. Please use the filmic rgb module instead.
Compress the tonal range of an HDR image into the limited tonal range of a typical LDR output file.
Global tonemap processes each pixel of an HDR image, without taking the local surrounding into account. This is generally faster than local tone mapping (deprecated), but might lead to less convincing results with very high-dynamic-range scenes.
- The operator to use. Reinhard, Filmic and Drago global tonemap operators are available. Depending on the selected operator, different parameters can be adjusted.
Some operators are fully self-adjusting, and do not require specific controls.
- bias (Drago operator only)
- This parameter influences the contrast of the output image. It is an essential parameter for adjusting the compression of high values and the visibility of details in dark areas. A value of 0.85 is recommended as a starting point.
- target (Drago operator only)
- A scale factor to adjust the global image brightness to the brightness of the intended display. It is measured in cd/m, and should match the brightness of your output device. Higher values lead to a brighter image, while lower values lead to a darker image.
- detail (all operators)
- This parameter controls how much detail is preserved from the original input image and transferred back into the output image after tonemapping.