Alt click on a node connection automatically disconnect it from the other nodes. And there is some nodes which can be easily summoned by pressing a key and clicking at the same time. Like B+click will place a branch, and S+click a sequence.
If you're willing to compile it, Aseprite is a great option as well.
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3D LUT Creator by Oleg Sharonov is a toolkit designed for professional color grading of digital images and video and creating 3DLUT-files that can be imported into many programs such as Adobe Photoshop, Adobe After Effects, Adobe Premiere Pro, DaVinci Resolve, FinalCut Pro.
Color correction in 3D LUT Creator was made by bending grid tied to the color plane containing the saturation and hue. The use of this interface allows user in few clicks completely change the color scheme of the image or work with the desired color ranges separately.
3D LUT Creator
A/B grid allows in few clicks to change the color of an object by dragging the desired color on the grid node to the desired hue and saturation without affecting other colors. In this case color gradients remains smooth because A/B grid does not work on a mask and acts like a smooth curves in Photoshop. Hue and saturation of color change regardless of the brightness.