What I’m working on is a bit more homebrew, tailored specifically for a project I’m working on. The pigment curves are optimized to match physically measured spectral data, and the mixing model is pretty different than spectraljs’ approach.

still image—

Here is another selection using permutations of three unique pigments instead of two. This is equivalent to uniform sampling within a 3D simplex, i.e. a tetrahedron.

It leads to less purity of any single ink, and is a little lower in overall saturation.

(GIF doesn’t work on BlueSky I guess?)

Adding another pigment (dimension) is quite easy with a neural network. Now it predicts concentrations for CMY + white + black, allowing for smooth grayscale ramps and giving us a bit of a wider pigment gamut.

A couple things that aren’t clear to me yet, is how Mixbox achieves such vibrant saturation during interpolations, and how they handle black & achromatic ramps specifically. I may be struggling to achieve the same because of my “imaginary” spectral coefficients.

I like the idea of a neural net as it's continuous, adapts to arbitrary input, and is fast to load and light on memory. However as you can see, it has a hard time capturing the green of the LUT at the beginning (although it doesn’t exhibit the artifacts with the saturated purple input).

I think certain dev tools could get away with it—like Vite, or my own canvas-sketch. I think the UX of an electron app may be better for average user but also hurts experienced devs; not just install time but also lack of browser diversity which is crucial if building for the web.

Looks amazing Scott. 👏

It's closer to Mixbox's implementation; using four primary pigments (each with a K and S curve), and then using numerical optimization to find the best concentration of pigments for a given OKLab input color. It's only running in Python at the moment, but LUT is possible.

github.com/scrtwpns/mix...

It just sets the background fill to none at the moment. It would be nice to have more options like per layer exports though.

Bitframes - an NFT project / crowdfunding initiative by @mattdesl.bsky.social to produce a documentary on #generativeart

bitframes.io