image-dimensions-stream

image-dimensions-stream

A Node module to get dimensions of any image file stream

Supported formats

• BMP
• GIF
• JPEG
• PNG
• PSD
• DDS

Upcoming

• SWF
• CUR
• ICO
• ICNS
• TIFF
• WebP
• SVG

Programmatic Usage

yarn add image-dimensions-stream

Example

const ImageDimensionsStream = require('image-dimensions-stream');
const pipeline = util.promisify(require('stream').pipeline);

async function main() {
  const sizeStream = new ImageDimensionsStream();
  let result = {
    mime: null,
    dimensions: null,
  };

  sizeStream.on('mime', (mime) => {
    console.log('mime:', mime);
    result.mime = mime;
  });

  sizeStream.on('dimensions', (dimensions) => {
    console.log('dimensions:', dimensions);
    result.dimensions = dimensions;
  });

  await pipeline(fs.createReadStream('images/funny-cats.png'), sizeStream, fs.createWriteStream('/dev/null'));

  return result;
}

main().then(console.log).catch(console.error);

Options

Key	Type	Default	Description
requireMime	boolean function	true	destroy stream if mime can't be found
requireDimensions	boolean function	true	destroy stream if dimensions can't be found
exif	boolean function	false	use EXIF (Orientation) data if available
requireValidExif	boolean function	false	destroy stream on invalid EXIF data otherwise just skip EXIF block. Only useful if exif option returns true
maxMimeChunkOffset	number	Minimum value possible	Whether to destroy the stream if we couldn't detect mime type after reading this amount of bytes
maxMimeBufferSize	number in bytes	4100	Maximum buffer size when detecting mime type
maxDimensionsBufferSize	number in bytes	64000	Maximum buffer size when detecting dimensions

Credits

image-size for test images and file structures