gemini-watermark-remover

What This Skill Does

The gemini-watermark-remover is a specialized utility for OpenClaw agents designed to clean Gemini-generated images by stripping the semi-transparent star/sparkle logo typically found in the bottom-right corner. Unlike generic content-aware fill tools, this skill employs a deterministic, mathematically precise reverse alpha blending algorithm. Because the Gemini watermark is a standard overlay, the skill reverses the compositing equation (original = (watermarked - alpha * 255) / (1 - alpha)) at the pixel level. This ensures that the underlying image details are reconstructed with high fidelity rather than blurred or hallucinated by AI inpainting. The process is entirely local, ensuring your private image data remains on your machine.

Installation

To integrate this skill into your environment, use the OpenClaw repository manager. Open your terminal and execute: clawhub install openclaw/skills/skills/fzlra/gemini-watermark-remover. Ensure your system has the required Python environment configured with Pillow and numpy installed via pip install Pillow numpy. The skill manages internal assets automatically for standard detection patterns.

Use Cases

This skill is perfect for content creators, developers, and researchers who need high-quality source images from Gemini for professional presentations, website assets, or social media. If you are aggregating AI-generated visuals for a documentation project or a design mockup, this tool eliminates the manual tedium of cropping or masking out logos. It is especially useful for batch processing folders of images where the watermark is consistently applied, allowing for clean, uniform outputs in seconds.

Example Prompts

• "OpenClaw, please run the watermark remover on my project folder at ./downloads/gemini_exports and save the clean versions to ./clean_output."
• "Remove the Gemini watermark from this image: ./assets/hero_banner.jpg and make sure to force the removal if the automatic detection fails to identify the logo."
• "Clean all images in my current directory that contain the Gemini logo and overwrite them with the watermark-free versions."

Tips & Limitations

To get the best results, ensure your input images have not been heavily compressed or downscaled after initial generation, as JPEG artifacts can interfere with the alpha blending math. While this tool excels at removing visible overlays, it cannot detect or remove invisible watermarks like Google SynthID. Always check the output quality after using the --force flag, as it may produce artifacts if the image size does not match the expected 48x48 or 96x96 watermark templates. This tool is purely for cosmetic logo removal and does not bypass hidden security metadata.