allenk/GeminiWatermarkTool — reverse-engineered prompt

Build me a small offline app for cleaning visible Gemini watermarks from images, with both a simple desktop window and a command line mode. I want to drag in one image or a whole folder, preview what will happen, then save clean copies without uploading anything to a server.

It should automatically detect whether the image has a Gemini watermark, skip files that don’t need work, and support the newer Gemini 3.5 watermark layout plus older legacy images. The main cleanup should use accurate reverse alpha blending, not random AI repainting, with an optional GPU denoise step to smooth leftovers.

Make it portable and fast, so normal people can download one executable and run it on Windows, Linux, or macOS. The command line version should be easy to script, return useful exit codes, and handle batch folders cleanly. If video support is already practical in this codebase, include the same style of offline workflow for Veo or Gemini watermarked videos too. Look up current docs online if you need to.