Generation Parameters
Every model in OpenCauldron supports a different set of parameters. The interface adapts automatically — you’ll only see the parameters that apply to your selected model.
Common parameters
Section titled “Common parameters”These parameters appear for most or all models.
Aspect Ratio
Section titled “Aspect Ratio”The width-to-height ratio of the generated output. Available for all models.
Common ratios and their typical use cases:
| Ratio | Use case |
|---|---|
| 1:1 | Social media posts, profile images |
| 16:9 | Landscape, presentations, desktop wallpapers |
| 9:16 | Stories, Reels, TikTok, mobile wallpapers |
| 4:3 | Traditional photo, print |
| 3:4 | Portrait photography, posters |
Some models support additional ratios like 2:1, 3:2, 21:9, and more. The available options update based on your selected model.
A number that controls the random generation process. Available on most image models and some video models.
- Leave empty for a random result each time
- Use the same seed with the same prompt and settings to reproduce an identical result
- Useful for iterating on a composition — change the prompt slightly while keeping the seed fixed
Output Format
Section titled “Output Format”Choose between PNG (lossless, larger files) and JPEG (compressed, smaller files). Available on Flux, Imagen, and Gemini models.
Use PNG when you need transparency or will edit the image further. Use JPEG for faster downloads and sharing.
Image parameters
Section titled “Image parameters”Negative Prompt
Section titled “Negative Prompt”Describe what you want to exclude from the generated image. The model will actively try to avoid these elements.
Available on: Imagen 4, Gemini Flash, Ideogram 3, Recraft, Kling, Veo
Examples:
blurry, low quality, watermark— general quality controltext, letters, words— avoid unwanted textpeople, faces, hands— exclude human figures
Resolution
Section titled “Resolution”Controls the output image dimensions. Higher resolution means more detail but slower generation.
| Model | Options |
|---|---|
| Imagen 4 | 1K, 2K |
| Gemini Flash / Lite | 512, 1K, 2K, 4K |
| Grok Imagine | 1K, 2K |
Apply a predefined artistic style to the output. Available on Ideogram 3 and Recraft.
Ideogram styles include realistic, cinematic, anime, watercolor, sketch, 3D, and more. Recraft offers realistic image, digital illustration, vector illustration, and icon styles with additional sub-style options.
Rendering Speed
Section titled “Rendering Speed”Trade off between speed and quality. Available on Ideogram 3.
| Option | Description |
|---|---|
| Turbo | Fastest generation, slightly lower detail |
| Default | Balanced speed and quality |
| Quality | Slowest, highest detail and coherence |
Guidance
Section titled “Guidance”Controls how strictly the model follows your prompt. Available on Flux Dev.
- Low values (1.5–2.5) — more creative, looser interpretation
- High values (3.5–5.0) — more literal, closely follows the prompt
- Default: 3.0
Number of diffusion steps during generation. Available on Flux Dev.
- Fewer steps (1–15) — faster, rougher output
- More steps (25–50) — slower, finer detail
- Default: 28
CFG Scale
Section titled “CFG Scale”Classifier-free guidance scale — similar to Guidance but used by different models. Available on Recraft (as artistic level).
Controls the balance between prompt adherence and creative freedom. Range: 0.3–0.7 (default: 0.5).
Person Generation
Section titled “Person Generation”Controls whether the model can generate images of people. Available on Imagen 4 and Gemini models.
| Option | Description |
|---|---|
| Allow All | Generate people of any age |
| Allow Adults | Only generate adults (default) |
| Don’t Allow | No people in the output |
This is a Google safety requirement. If your prompt mentions people and this is set to “Don’t Allow,” the generation may fail.
Video parameters
Section titled “Video parameters”Duration
Section titled “Duration”Length of the generated video clip in seconds. Available options depend on the model:
| Model | Durations |
|---|---|
| Veo 3 | 5s, 8s |
| Veo 3.1 | 4s, 6s, 8s |
| Runway Gen-4 | 5s, 10s |
| Kling 2.1 | 5s, 10s |
| Hailuo 2.3 | 6s, 10s |
| Ray 2 | 5s, 10s |
| Ray Flash 2 | 5s, 9s |
Generate Audio
Section titled “Generate Audio”When enabled, the model produces a synchronized audio track with the video. Available on Veo 3/3.1 and Hailuo 2.3.
Audio is generated natively — the model creates sounds that match the visual content (footsteps, speech, ambient noise, etc.).
Camera Motion
Section titled “Camera Motion”Apply a predefined camera movement to the video. Available on Ray 2 and Ray Flash 2.
| Option | Description |
|---|---|
| None (auto) | Model decides camera behavior |
| Pan Left / Right | Horizontal camera slide |
| Zoom In / Out | Move toward or away from subject |
| Orbit Left / Right | Circle around the subject |
Toggle parameters
Section titled “Toggle parameters”These are on/off switches that appear at the bottom of the parameters panel.
Watermark
Section titled “Watermark”Adds a provider watermark to the output. On by default. Available on Imagen 4 and Gemini models.
Disabling the watermark may affect your usage terms with the provider — check your API agreement.
Provider Prompt Enhance
Section titled “Provider Prompt Enhance”Lets the AI provider automatically rewrite your prompt before generation to improve results. Available on Imagen 4 and Gemini models.
When enabled, the provider may add detail, improve grammar, or restructure your prompt. The original prompt is preserved — enhancement happens behind the scenes.
Prompt Optimizer
Section titled “Prompt Optimizer”Similar to Provider Prompt Enhance, but used by Hailuo/MiniMax. Optimizes your prompt on the provider side for better video generation results.
Loop Video
Section titled “Loop Video”Makes the generated video seamlessly loop back to its first frame. Available on Ray 2 and Ray Flash 2.
Useful for creating background animations, loading screens, or social media content that plays on repeat.
Parameter support by model
Section titled “Parameter support by model”Quick reference for which image models support which parameters:
| Parameter | Imagen 4 | Gemini Flash | Flux Pro | Flux Dev | Ideogram 3 | Recraft | Grok |
|---|---|---|---|---|---|---|---|
| Negative Prompt | Yes | Yes | — | — | Yes | Yes | — |
| Resolution | Yes | Yes | — | — | — | — | Yes |
| Seed | Yes | Yes | Yes | Yes | Yes | — | — |
| Output Format | Yes | Yes | Yes | Yes | — | — | — |
| Style | — | — | — | — | Yes | Yes | — |
| Rendering Speed | — | — | — | — | Yes | — | — |
| Guidance | — | — | — | Yes | — | — | — |
| Steps | — | — | — | Yes | — | — | — |
| CFG Scale | — | — | — | — | — | Yes | — |
| Person Generation | Yes | Yes | — | — | — | — | — |
| Watermark | Yes | Yes | — | — | — | — | — |
| Prompt Enhance | Yes | Yes | — | — | — | — | — |