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Stop guessing at image generation APIs. Build a FastAPI service that takes a photo, sends it to FLUX or GPT Image, and returns a transformed coloring page. With the provider pattern, you can swap models in one line.
Message a mentor about fit, prerequisites, or where to start. Replies come on WhatsApp, usually within a day.
Engineers are learning here from
Build an image-to-image API that converts photos into coloring pages. Learn the provider pattern, FLUX Kontext Pro on Fireworks, GPT Image on OpenAI, PIL optimization, and prompt engineering for image generation.
Build an image-to-image API with FLUX and the provider pattern.
What you'll ship
What you'll learn
Curriculum
Image API basics
Set up your environment, build a file upload endpoint, and generate your first image with FLUX
Provider pattern and optimization
Refactor into swappable providers, add OpenAI GPT Image, optimize images with PIL, and enhance prompts with an LLM
Who it's for
who have built text-based LLM apps but want to work with image generation
who need to add image transformation features to an existing product
who want to understand how FLUX and GPT Image APIs differ under the hood
FAQ
No. Both Fireworks and OpenAI handle GPU inference in the cloud. You just send an API request and get an image back.
The project supports Fireworks (FLUX Kontext Pro) and OpenAI (GPT Image). Fireworks has a generous free tier for FLUX. You only need one API key to follow along.
No. This is image-to-image generation. You upload a photo, and the API transforms it into a coloring page using a structured prompt. The techniques apply to any image transformation task.
Pricing
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Image-to-image generation with FLUX and provider pattern
$29 one-time