[UHD] Sinew To See You

Base image was a spline spirograph from G'MIC-Qt, a brand new render from G'MIC 3.3.6 made by David Tschumperlé. Then I messed with colour curves a while to get the red/black color. Then the stringify filter, also newly added by David. Then on a duplicate layer with 2/3 alpha and glow blend mode, I ran angoisse anguish, then stringify again with only 16 levels, then used an eraser to keep only the highlight areas. This is what adds the high contrast dark red/black zones in the top, the right, and a small bit to the left of the image. Stringify takes a long time to run on big images, but the result is really nice, a very unique "texture".