Update SKILL.md with accurate color correction documentation

- Replace hardcoded warning with explanation of why automatic detection isn't possible
- Document --invert_colors for luminosity inversion
- Document --swap_bgr for BGR<->RGB channel swapping
- Explain that VAE output format is model-specific

SKILL.md

@@ -535,13 +535,22 @@ Auto mode detects NSFW content automatically. For explicit requests:
 python3 videogen --model <model> --prompt "<prompt>" --no_filter
 ```
 
-### 5. Color Inversion
+### 5. Color Correction
 
-Some models (particularly certain LoRA adapters) may produce inverted colors. Fix this with:
+Some models may produce videos with incorrect colors. Two manual fixes are available:
+
+**Color inversion (luminosity)** - Dark areas appear light, light areas appear dark:
 ```bash
 python3 videogen --model wan2_2_i2v_general_nsfw_lora --image input.png --prompt "..." --invert_colors
 ```
 
+**BGR/RGB channel swap** - Colors have wrong tint (red appears blue, etc.):
+```bash
+python3 videogen --model wan2_2_i2v_general_nsfw_lora --image input.png --prompt "..." --swap_bgr
+```
+
+**Note:** There is no standard way to automatically detect RGB vs BGR output from diffusion models. The VAE output format is model-specific and not declared in metadata. Users must visually inspect output and apply corrections as needed.
+
 ### 6. Reproducibility
 
 Always capture and store the seed for reproducibility: