Binary Image Utilities

Utilities to extract metadata such as image format (MIME type) and size (dimensions) from binary images without parsing the full image. Looks for format-specific headers in the encoded binary data (e.g. encoded JPEG or PNG images).

The format is reported using MIME types strings. Supported binary formats and their MIME types are:

Format	MIME Type
PNG	image/png
JPEG	image/jpeg
BMP	image/bmp
GIF	image/gif

Usage

const response = await fetchFile(imageUrl);
const arrayBuffer = await response.arrayBuffer();

const metadata = getBinaryImageMetadata(arrayBuffer);
if (medata) {
  const {width, height, mimeType} = metadata;
}

Functions

getBinaryImageMetadata(imageData: ArrayBuffer | DataView): object | null

Parameters:

• imageData: Binary encoded image data.

Returns a metadata object describing the image. Returns null if the binary data does not represent a known binary image format.

{
  mimeType: string;
  width: number;
  height: number;
}

If mimeType is supplied, assumes the image is of that type. If not supplied, first attempts to auto deduce the image format (see getImageMIMEType).