Image Info Extractor

A JavaScript lib to read image info and to extract/parse image metadata.

Warning This project is currently experimental.

Features

This lib supports most web image formats: JPEG, PNG, WebP, AVIF, SVG.

Image info reading

Image info reading support: width, height, alpha, bit depth, animation, lossless, rotation, mirror, progressive, grided

Note: the width and height are directly retrieved, you should also look at the rotation and mirror to render an image properly.

Metadata extracting

Metadata extracting support: EXIF, XMP, ICC

Additional extracting support: JFIF, Extended XMP, IPTC for JPEG, XMP in SVG

Table 1: raster image metadata extracting support (Y: yes, N: no)

Image format \ Metadata format	EXIF	XMP	ICC
JPEG	Y	Y	Y
PNG	Y	Y	Y
WebP	Y	Y	Y
AVIF	Y	Y	Y

Metadata parsing

Metadata parsing support: EXIF 2.32, XMP 1.0, ICC 4.4

Optional support:

• Vendor-specific XMP tag type mapping

TODOs:

• Vendor-specific EXIF MakerNote parsing

Data getters

• Thumbnail data in EXIF
• GPS info in EXIF
• Date tags in EXIF

Install

Browser Requirements

• Chromium 80
• Firefox 113
• Safari 16.4
• Node.js 20

Install with NPM

npm install image-info-extractor

Usage

import {readFile, parseResult} from 'image-info-extractor';

// first, pick a file

// then pass the file to extractor
readFile(file).then(parseResult).then((result) => {
  console.log('result', result);
});

For detailed usage in browser, see image-info-extractor.html and sidecar-file-viewer.html under examples/

For detailed usage in Node.js, see image-info-extractor.js and sidecar-file-viewer.js under examples-nodejs/

Related Efforts

This project is derived, with heavy modifications, from

• https://github.com/titarenko/fast-exif
• https://github.com/devongovett/exif-reader
• https://github.com/lovell/icc

License

MIT

Copyright © 2023 Fuwei Chin and others