Add Nodes/Image/Desaturate

Nodes%2FImage%2FDesaturate.md

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+# Desaturate
+
+---
+
+## 🔌 INPUT PORTS
+
+| Name          | Type                    | Description                                      |
+|---------------|-------------------------|--------------------------------------------------|
+| `inputTexture`  | `ImageData`             | The input image data to desaturate.              |
+
+---
+
+## 📤 EXPORT PORTS
+
+| Name            | Type        | Description                                             |
+|------------------|-------------|---------------------------------------------------------|
+| `inputTexture`      | `ImageData` | The resulting desaturated image, stored as `ImageData`. |
+
+---
+
+## 📝 DESCRIPTION
+
+The **Desaturate** node transforms a full-color texture into a grayscale version.  
+
+The luminance calculation uses the following formula:
+
+```text
+Gray = 0.2989 * Red + 0.5870 * Green + 0.1140 * Blue
+```
+
+Ideal for previews, stylized effects, or preprocessing steps in visual pipelines.
+
+This node is derived from [`BaseImageNode`](../../../Nodes/BaseImageNode).
+
+---
+
+## ⚠️ KNOWN ISSUES
+
+- Currently only supports `Color32` format via `NativeArray`.
+
+---