The open triangles, or outside markers, indicate the open (mostly wider) edge of the trapezoidal function. The filled triangles, or inside markers, indicate the closed (mostly narrower) edge of the trapezoidal function.
DARKTABLE MASK FULL
Intermediate points between full and zero are given a proportional opacity. Two open triangles below the slider mark the range values where opacity is 0. Two filled triangles above the slider mark the range of values where opacity is 1. For this purpose there are four markers per slider. With each color channel slider you can construct a trapezoidal opacity function. Press A again to toggle back to ’linear’ mode. This provides more fine control in the shadows. Press the letter A while hovering over the a slider to change its display to ’log’ mode. When the mouse pointer leaves the slider the image returns to normal after a short delay. Press the letter M to see the resulting mask for that slider overlaid on the image. The center image changes to display that color channel either in gray-scale values or in false colors depending on the setting in preferences > darkroom > display of individual color channels. Press the letter C while hovering over a channel’s input/output slider to view the input/output image data for that color channel. This slider is only available for channels where it is meaningful. It may be used in scene referred editing, where luminance values may extend beyond 100%, to target highlights. The boost factor slider allows the range of values targeted by the parametric mask sliders to be extended. The sliders for the output data channels are hidden by default and can be shown using the show output channels option in the blending menu. Two sliders can be shown for each associated data channel: one that works on the input data that the module receives and one that works on the output data that the module produces prior to blending. See Wikipedia for more details about these color spaces. However, the Jzazbz color space is much better for high dynamic range images and is less susceptible to hue shifts than Lab space. Like the L in Lab color space, the Jz is a representation of the luminosity of a pixel that aligns with how we perceive brightness. The JzCzhz color space is a polar representation of the Jzazbz color space, in the same way that LCh is a polar representation of the Lab space. The g (gray) value is calculated as a weighted average of the R, G & B channels, the exact weightings depending on the working color space being used. Modules acting in scene-referred RGB color space have data channels for g (gray), R, G, B, Jz (luminance component of JzCzhz), Cz (chroma, or saturation, of JzCzhz), and hz (hue of JzCzhz). Modules acting in display-referred RGB color space have data channels for g (gray), R, G, B, H (hue of HSL), S (saturation of HSL), and L (lightness of HSL). Modules acting in ( display-referred) Lab color space have data channels for L, a, b, C (chroma of LCh) and h (hue of LCh).
🔗channel tabsĬlick on one of the channel tabs to select a data channel to use to build your mask.
If the blend mask has a value of 1 (100%) for a pixel, the module has its full effect. If the blend mask has a value of 0 for a given pixel, the input of the module is left unchanged. All blending factors are finally multiplied together (pixel-by-pixel), along with the value of the global opacity slider, to form a complete parametric blend mask for the image. Depending on each pixel’s value for a given data channel this function calculates a blending factor between 0 and 1 (100%) for that pixel.Įach pixel of an image thus has different blending factors for each of its data channels. hue, saturation) you can construct a per-channel opacity function. Lab, RGB) and several virtual data channels (e.g. These parameters are color coordinates rather than the geometrical coordinates used in drawn masks.įor each data channel of a module (e.g. It does this by automatically generating an intermediate blend mask from user-defined parameters. The parametric mask feature offers fine-grained selective control over how individual pixels are masked.
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