Prompt 21

GPTClaudeGemini··▲ 737 copies·updated 2026-07-14

prompt-21-2.prompt

Create a Flask app, which allows users to upload images. The image is converted to grayscale and returned back to the user as base 64 data.

Output:

when to use it

Community prompt sourced from the open-source GitHub repo barun-saha/CodePrompt (MIT). A "Prompt 21" style prompt — adapt the placeholders and specifics to your task. Imported as-is and not independently retested here, so check the output before relying on it.