# Image generation and vision model guide

Vision understanding and image generation use different interfaces; generation projects must validate prompt adherence, editing consistency, text, likeness rights, moderation, and output terms.

## Separate understanding from generation

Sending an image to a multimodal chat model means understanding it and returning text; creating or editing an image uses a dedicated image or media job. Models, billing, payloads, and safety differ even though both are described as vision.

## Input design

Specify text-to-image, image-to-image, inpainting, or multi-reference consistency and record aspect ratio, size, format, seed, and reference strength. Bound image size, type, and fetch origin; a server must not retrieve arbitrary URLs.

## API workflow

Synchronous endpoints return bytes or a URL, while asynchronous endpoints return a job ID and need idempotent creation, bounded polling, terminal-state handling, and result transfer. Base64 expands memory and logs, so high-concurrency systems should prefer streaming upload and object storage.

## Evaluation

Use fixed prompts and references to measure composition, identity, hands, spelling, brand color, edit preservation, and diversity. Automated metrics can filter, but human review remains essential for creative quality and rights.

## Safety and rights

Verify input copyright, likeness consent, trademarks, sensitive content, and provider output terms. Generation is not a rights warranty; retain prompts, model version, moderation results, and approval records.

## Use cases

- Image understanding and OCR
- Generation and editing
- Brand asset production

## API paths

- /v1/chat/completions
- /v1/images/generations

## Related guides

- [Black Forest Labs](https://api.tu-zi.com/en/docs/providers/black-forest-labs): Focused on high-quality image generation and editing across realtime previews, production workflows, and fine-grained control.
- [FLUX image models](https://api.tu-zi.com/en/docs/models/flux): FLUX.2 officially separates klein, max, pro, and flex for fast local inference, maximum consistency, production quality, and typography, with different APIs and licenses.
- [Google Gemini](https://api.tu-zi.com/en/docs/models/gemini): Gemini is Google's multimodal family; the official catalog lists separate models and methods for general reasoning, low latency, images, video, audio, embeddings, and agents.
- [ByteDance Jimeng](https://api.tu-zi.com/en/docs/providers/jimeng): Direct Jimeng access uses `visual.volcengineapi.com` and Volcengine signing, while this gateway's `/v1/videos` uses its own Bearer token. Persist task IDs, handle terminal states, and copy temporary media promptly.

## Frequently asked questions

### Are image analysis and image generation the same API?

Usually not. Vision understanding sends an image to multimodal chat and returns text, while image creation or editing uses an Images or media endpoint. Payloads, models, billing, and moderation can all differ.

### Is the job complete when an image API returns a URL or task ID?

Not necessarily. A task ID only means an asynchronous job was accepted and must reach a successful terminal state. A returned URL may be temporary, so validate media type and size and stream it promptly into controlled object storage.

### How do I control image-generation cost and memory use?

Cap dimensions, image count, concurrency, and failed retries, and choose quality only as needed. Base64 expands responses and logs; high-concurrency services should prefer streaming upload and URLs or object storage over retaining batches in memory.

### How should generated images be evaluated, and are they automatically safe for commercial use?

Use fixed prompts and references to check adherence, identity, text, edit preservation, and brand color, with human review. Generation is not a rights warranty; verify input copyright, likeness consent, trademarks, moderation, and provider output terms.

## Sources

- OpenAI Models: https://developers.openai.com/api/docs/models
- BFL API: https://docs.bfl.ai/quick_start/introduction

## Documentation source

Source: https://api.tu-zi.com/en/docs/use-cases/image-generation

Reviewed: 2026-08-08

This document is an integration reference. Provider-native APIs may differ from this site's APIs; use the corresponding API Reference and model marketplace to confirm the site URL, authentication, model ID, group and parameters. This document does not certify live success for every model or upstream service. It contains documentation and examples, without the current user's credentials or request history.