Add Nodes/Image/InvertChannel

Nodes%2FImage%2FInvertChannel.md

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+# Invert Channel
+
+---
+
+## 🔌 INPUT PORTS
+
+| Name            | Type               | Description                                                                 |
+|-----------------|--------------------|-----------------------------------------------------------------------------|
+| `Input Channel` | `SplitChannelData` | The single-channel input data to invert (e.g., R, G, B, or A from an image).|
+
+---
+
+## 📤 EXPORT PORTS
+
+| Name             | Type               | Description                                                                 |
+|------------------|--------------------|-----------------------------------------------------------------------------|
+| `Output Channel` | `SplitChannelData` | The inverted output channel. Each byte is calculated as `255 - inputValue`. |
+
+---
+
+## 📝 DESCRIPTION
+
+The **Invert Channel** node performs a per-pixel inversion of a single channel of an image.  
+This is useful for creating negative effects, generating masks, or processing grayscale data.
+
+This node is derived from [`BaseImageNode`](Nodes/BaseImageNode).
+
+---
+
+## ⚠️ KNOWN ISSUES
+
+-N/A