damping (“random” method only) Controls the level of added random noise expressed as a damping factor in a 10*log 2 basis. Random dithering: This method just adds some level of randomness to break sharp tonal value bands. Alternatively, you can select floyd-steinberg auto, which automatically adapts to the desired output format. This method can be selected with some typical output bit depths. 🔗module controls method Choose the dithering method to use.įloyd-steinberg: Systematically distribute quantization errors over neighboring pixels. Note that, as a consequence, the scopes module – the data for which is derived from the navigation window – will show this increased number of levels and is therefore not a full match to the output image.
This is accomplished by dithering those images into a higher number of grayscale levels. darktable attempts to mimic this impression when rendering zoomed-out images in the center view, the navigation window and thumbnails. “floyd-steinberg 1-bit b&w”) will give the impression of a homogeneous grayscale image. Viewing an image dithered into a very low bit depth from some distance (e.g. Also watch out for banding artifacts when using a gradient drawn mask. This is especially relevant for images with extended homogeneous areas such as cloudless sky. To mitigate possible artifacts you should consider activating dithering when using the vignetting or graduated density modules. This module eliminates some of the banding artifacts that can result when darktable’s internal 32-bit floating point data is transferred into discrete 8-bit or 16-bit integer output format for display or export.Īlthough not an inherent problem in any of darktable’s modules, some operations may provoke banding if they produce a lightness gradient in the image.
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