detectImageMediaType
Read an image's media type from its magic bytes.
Sniffs the first twelve bytes of image data and returns the media type it finds: PNG, JPEG, GIF, WebP, HEIC, or BMP. Nothing else is inspected, so the answer is only as good as the header.
generateImage already uses this to label results a provider returns without
a media type. Reach for it directly when you have raw bytes from somewhere else
— a file on disk, a download, a pasteboard — and need to tag them before
sending them to a model.
let mediaType = detectImageMediaType(bytes) ?? "image/png"Signature
func detectImageMediaType(
_ image: Data
) -> String?Defined in Sources/AI/Core/ImageGeneration.swift.
Parameters
| Parameter | Type | Default |
|---|---|---|
_ | Data | required |
Returns
The media type as a String, or nil when the header matches none of
the recognized formats or the data is shorter than twelve bytes.