You can use the module to expand or condense the dynamic range of a scene to correspond to the dynamic range of a display. As outlined in the in-depth darktable 4.2.0 user manual, you use the Sigmoid display transform module to remap the tonal range of image using a generalized log-logistic curve.

See guides & overlays for details.Starting with the Sigmoid display transform module, this can be used in place of the existing filmic and base curve modules. Click the icon on the right to control the properties of the guides. show guides Tick the box to show guide overlays whenever the module is activated. You can also activate a color picker to take a color probe from the image. Clicking on the colored field will open a color selector dialog which offers a choice of commonly-used colors, or allows you to define a color in RGB color space. border color / frame line color A pair of color selectors which allow the border and frame line colors to be defined.

Choose 100% for a frame line that touches the outer border. Choose 0% for a frame line that touches the image. frame line offset The position of the frame line, relative to the underlying image. frame line size The percentage of the frame line size, relative to the border size at its smallest part. You can also right click and enter your own ratio as “x/y”. horizontal/vertical position Select from a set of pre-defined ratios to control where the underlying image will be positioned on the horizontal/vertical axis. Select ‘auto’ for darktable to choose the most reasonable orientation based on the underlying image. orientation The orientation of the frame (portrait/landscape). Right-click on the slider to enter a custom aspect as a ratio (e.g.

aspect The aspect ratio of the final module output (i.e. 🔗module controls border size The size of the frame as a percentage of the underlying full image. Various options are available to control the geometry and color of the frame. The frame consists of a border (with a user-defined color) and a frame line within that border (with a second user-defined color).

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