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-# ComfyUI-StepByStep-Sampler
-ComfyUI-StepByStep-Sampler
+# 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.
+
+[![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)
+
+![Node Screenshot](images/workflow_image.png)
+
+## Node description
+
+### 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.
+
+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.
+
+### 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.
+
+## Installation
+Manual Install
+```
+Bash
+cd ComfyUI/custom_nodes
+git clone https://github.com/TakkunRed/ComfyUI-StepByStep-Sampler.git
+```
+## How to Use
+### Workflow Integration
+* Add the Step-by-Step Sampler node.
+* Connect `model`, `positive`, `negative`, `latent_image`, and `vae` to the respective inputs.
+* Connect the `STEP_IMAGES` output to the `StepStepPlayer` or `StepStepComparer` node. You can also connect it to `Preview Image` or `Save Image`.
+* Run Queue Prompt as usual, and the generation process will appear in the viewers.
+
+### Viewer Controls
+* `Player`: Change steps using the bottom slider or use the "Play" button for auto-playback.
+* `Comparer`: Select two steps to compare using the sliders, and drag the vertical bar on the image to reveal the differences between side A and side B.
+
+### Step-by-Step Sampler Settings
+* `save_interval`: Determines how often images are saved (e.g., set to 1 to capture every step).
+* `show_overlay`: Toggles the on-image display of step numbers and difference metrics.
+* `diff_method`: Selects the algorithm for calculating step-to-step changes:
+    * Metric Characteristics (at convergence):
+        ```
+        MSE → 0 (Emphasizes large changes)
+        RMSE → 0 (MSE scaled back to L1 range)
+        L1 → 0 (Simple, robust against outliers)
+        PSNR → ∞ (Higher dB means closer to previous step; 40dB+ is a typical convergence target)
+        SSIM → 1.0 (Structural Similarity Index; 0.99+ is a typical convergence target)
+        ```
+## License
+MIT