![]() You find a row of notebook tabs named after color channels: “L”, “a” and “b” for modules that act in Lab color space “gray”, “red”, “green” and “blue” for modules that work in RGB color space. You see the already familiar controls (blend mode, opacity) plus a new checkbox that says “blend if …” If you toggle that box, a further control area appears beneath. A first lookĮnter a module that supports blending, like “tone curve”, and activate blending with the corresponding checkbox. Don’t be afraid we look at it step by step and you will quickly become comfortable with it. This gives a lot of power for a very detailed control, but it might at first appear a bit complicated. With each of up to four color channels, both independently for the input image and the output image, we can decide to what extent pixels should be blended or not.Īs this is done with four parameters for each channel, you are in the position to juggle with up to 32 values. This one does not use geometrical but color coordinates to control blending effects. Today I want to present to you an alternative technique available as a development branch in git called “blendif” (soon to be integrated into master for the new development round after darktable 1.0). A corresponding method using layer masks is currently under development in darktable. Obviously we could do this based on geometrical coordinates on the image plain. However, there are cases when this is not enough, because we want to limit the effect to certain parts of the image. The opacity slider already gives us some very nice control. We already used this technique here to tone down the effect of shadow recovery. In-between opacity values allow to gradually blend the effect of this module into the original image. If opacity is 0% the upper layer is completely transparent, you see the input image as if the module has no effect. If opacity is 100% the upper layer will completely mask the lower one you get the full effect of the module. The lower one represents the input image, the upper one is the original output of our module (the one we would get without blending). Think of this as a layer of two transparencies. Depending on the setting of slider “opacity” this allows to control the strength of a module’s effect. In many cases it is the most basic blend mode “normal” that we want. As an example refer to here, where we took blend mode “overlay” with module “lowpass” to do shadow recovery. Based on the blend setting they will take their original output together with their input and do a re-processing. Instead of just handing over their result to the subsequent module in pixelpipe, “blending modules” take a moment to reconsider. ![]() Diligent readers of our small blog series are already aware of the blending feature that darktable offers as part of many modules.
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