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# ComfyUI-StepByStep-Sampler
A set of custom nodes for ComfyUI designed to analyze and compare the image generation process step-by-step. It quantifies changes in latent variables (using metrics like PSNR/SSIM) and provides a dedicated viewer for intuitive inspection.
A set of custom nodes for ComfyUI designed to analyze and compare the image generation process step-by-step. It quantifies changes in latent variables (using metrics like PSNR/SSIM) and provides a dedicated viewer for intuitive inspection. Furthermore, since sampling automatically stops once image generation converges, image generation can be performed with the optimal number of steps.
[![GitHub license](https://github.com/TakkunRed/ComfyUI-StepByStep-Sampler)](https://github.com/TakkunRed/ComfyUI-StepByStep-Sampler/blob/main/LICENSE)
[![ComfyUI](https://img.shields.io/badge/ComfyUI-Custom_Nodes-blue)](https://github.com/comfyanonymous/ComfyUI)
@@ -11,20 +11,19 @@ A set of custom nodes for ComfyUI designed to analyze and compare the image gene
### 1. Step-by-Step Sampler
Hooks into the generation process to capture intermediate images at specified intervals by VAE encoding the latent state. It can be integrated with `Preview Image` or `Save Image` nodes to display or output the progression as a sequence.
Calculates the amount of change from the previous step using MSE, RMSE, L1, PSNR, or SSIM, allowing you to monitor convergence numerically.
Draws step counts and difference values directly onto the images, making it easy to track the step number and the delta from the preceding frame.
Since sampling automatically stops once image generation converges, image generation can be performed with the optimal number of steps.
Outputs the final result as a standard `LATENT` (similar to KSampler), but can also output the VAE-encoded image via the `LAST_IMAGE` socket.
### 2. Step-by-Step Player
Visualizes the image list output from the `STEP_IMAGES` socket of the `Step-by-Step Sampler`. Use the slider or the Play button to view the generation process as an animation.
<img src="images/StepByStepImage.png" width="50%">
### 3. Step-by-Step Comparer
A side-by-side visualization tool for the `STEP_IMAGES` output. It allows you to compare two different steps (e.g., Step 5 vs. Step 20) using an interactive split-screen slider.
![Node Screenshot](images/StepByStepImage.png)
<img src="images/StepByStepImage.png" width="50%">
<img src="images/comparer.png">
## Installation
Manual Install
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