This custom node adds Spectrum feature forecasting to ComfyUI's native Ideogram 4 transformer. It forecasts image-token features between selected actual evaluations while retaining the native Ideogram output head and falling back to an actual evaluation when a forecast is not safe.
From the ComfyUI installation directory:
cd ComfyUI/custom_nodes
git clone https://github.com/Nif00/ComfyUI-Spectrum-Ideogram4.gitRestart ComfyUI after installation.
For the two-model Ideogram workflow, apply Spectrum to both models with the same settings:
regular Ideogram4 model -> ModelSamplingAuraFlow -> Spectrum Apply Ideogram 4 -> DualModelGuider.model
unconditional Ideogram4 model -> Spectrum Apply Ideogram 4 -> DualModelGuider.model_negative
The regular model drives the shared sampler schedule; regular and unconditional forecast histories remain separate. If CFG is 1, the negative model is skipped.
| Setting | Default |
|---|---|
| Blend weight | 0.50 |
| Degree | 1 |
| Ridge lambda | 0.1 |
| Window size | 2.0 |
| Flex window | 0.75 |
| Warmup steps | 15 |
| Tail actual steps | 2 |
| Max history | 15 |
The node requires ComfyUI's native Ideogram4Transformer2DModel. Spectrum step
tracking is supported for Euler, Euler CFG++, RES multistep, and RES multistep
CFG++; other samplers continue through the native path.