ImageEffectsSepia

Sepia is the fastest way to make anything look like it's from another century, and ImageEffectsSepia from the Allor plugin is the fastest way to apply it in ComfyUI. One input, one output, nothing to configure. If you've ever added a sepia LUT or fought with a three-node color-matrix chain to get this effect, this node is the shortcut you wanted.

How it works

It's the classic sepia transformation done with a fixed 3×3 color matrix - the same coefficients you'd find in any image library:

R' = 0.393·R + 0.349·G + 0.272·B
G' = 0.769·R + 0.686·G + 0.534·B
B' = 0.189·R + 0.168·G + 0.131·B

Apply that per pixel and you get the warm brownish tint everyone recognizes from old prints. The node runs it as a tensor multiplication in the pack's usual style - no PIL round-trip, whole batch at once - so it's effectively free in a post-processing chain. And like the rest of Allor's effects, it leaves the alpha channel alone, so transparent cutouts survive the trip intact.

Inputs and output

• images - an IMAGE or a batch. The only input.
• Output: an IMAGE with the sepia look applied.

That's genuinely the whole node. There's no intensity slider and no "strength" input - it's all-or-nothing, which fits a pack that leans on "simple, predictable, no surprises" utilities.

Installing it

It ships in the Allor pack, installed once for all ~90 nodes:

cd ComfyUI/custom_nodes
git clone https://github.com/Nourepide/ComfyUI-Allor

Restart ComfyUI, or search for Allor Plugin in ComfyUI Manager. The pack installs rembg and onnx on first launch - expect a slow first start, then nothing. No model downloads needed here.

Gotchas

• It's fixed-strength. If you want a hint of sepia rather than full sepia, run this and then blend the result with the original using an alpha-composite node at partial opacity. Slightly more work, but that's the honest way to get a subtle look.
• The conversion is applied to RGB only; alpha passes through.
• Same pack-wide reminder as every Allor node: the repo was rebased to shrink its git history, so an old clone can fail on git pull. If auto-update breaks, re-clone.

For the monochrome companion piece, grab ImageEffectsGrayscale from the same pack.