What the model is
We render with OpenAI's image model through their API. We do not train our own model and we do not fine-tune on customer content. We may change providers or model versions; this page is updated when we do.
What we send
- A prompt we write: your game's title, the genre playbook, your brief and any notes, plus our art-direction instructions. Prompts are never shown publicly and are not part of any dataset.
- Your reference images, resized to at most 1,536 pixels on the long edge: uploaded logos, characters, screenshots, and the header and screenshots from your Steam page if you chose them.
- For refines and kits: only the concept you picked (and your logo file, if you uploaded one). Not your screenshots.
We do not send your name, email, IP address or payment data to the model provider. Requests are made with our own key; you never need an account with any AI company.
What we do not do
- We never use your uploads or your results to train or improve any model, ours or anyone else's.
- We never show your sheets as examples on this site without written permission.
- We never write your uploaded files to storage; they exist in memory for the render only. OpenAI may retain what it received for up to 30 days for abuse monitoring, and does not train on API content. The brief text is kept with your sheet so you can refine it later.
How your art is treated in the prompt
Uploaded assets are instructed to be treated as canon: same faces, masks, proportions and silhouettes; the model is told to change lighting, framing and polish, not identity. With the logo set to keep, it is told to reproduce your logo exactly. This works well most of the time and imperfectly some of the time. It is a generative model, not a compositor: always check the result.
Ownership and disclosure
- Outputs generated for you belong to you, as far as we are able to give them to you. See the Terms, section 6.
- You confirm you hold the rights to everything you upload, including the right to have it processed by an AI system. Terms, section 5.
- Steam disclosure. Valve asks developers to disclose AI-generated content in the Steamworks content survey, and the disclosure appears on your store page. Capsules made here are AI-generated. Valve's content survey is aimed at AI content that ships inside the game; whether store assets need a declaration is for you to confirm against Valve's current guidance, or with Steamworks support if in doubt. Many developers use them as concepts and have an artist finish the final asset; that is a fine workflow too.
Machine-readable AI marking
The EU AI Act (Article 50) requires AI-generated images to be marked in a machine-readable way. Every file you download from us, previews, sheets, banners, headers and every kit asset, carries that marking: XMP metadata with the IPTC digital source type “trainedAlgorithmicMedia” and an EXIF description stating the image is AI-generated and made with steambanner.com. Our own cropping and resizing keeps it. If you re-save a file in another tool, that tool may strip metadata; keep our originals if you need the marking to travel with the image. This is separate from any visible label a platform may ask for.
Limits of the technology
- Text can come out misspelled, especially long taglines. Check every letter before uploading to Steam.
- Similar briefs can yield similar images, for you and for other users. No output is guaranteed unique.
- The provider's safety systems may decline a request (for instance realistic gore or a real person's face). Declined requests are refunded.
- Renders take one to two minutes and occasionally fail. Failed renders are refunded automatically.
Questions
Email patrick@nightmarestudios.net. If you want a specific file removed from our provider's abuse-monitoring retention sooner than their standard window, tell us and we will forward the request.