PIXLRelight Renderer ONNX

This repository contains ONNX exports of the feed-forward PIXLRelight renderer core. The renderer takes a source RGB image and a 9-channel target-light intrinsic tensor, then returns relit RGB plus gain and bias maps.

Exports:

pixlrelight_renderer.onnx + .data: FP32, CPU/server-safe. Inputs are float32 source_images [B,3,512,512] and target_intrinsics [B,9,512,512].
webgpu/pixlrelight_renderer_fp16.onnx + .data: FP16, browser/WebGPU-oriented. Inputs are float16 source_images [B,3,512,512] and target_intrinsics [B,9,512,512].
int4/pixlrelight_renderer_int4.onnx + .data: weight-only INT4 MatMulNBits export, currently the smallest browser-facing artifact. Inputs remain float32; activations remain floating point.

Outputs are rgb, rgb_gain, and rgb_bias.

Boundary: this is the PIXLRelight renderer core, not the upstream Marigold RGB target-image-to-intrinsics decomposer. Marigold is a separate diffusion pipeline and is intentionally not embedded in these ONNX files.

Upstream: https://github.com/mlfarinha/pixlrelight License: CC BY-NC 4.0, following the upstream model.