ImageCapture: getPhotoCapabilities() method

The getPhotoCapabilities() method of the ImageCapture interface returns a Promise that resolves with an object containing the ranges of available configuration options.

Syntax

getPhotoCapabilities()

Parameters

None.

Return value

A Promise that resolves with an object containing the following properties:

redEyeReduction

Returns one of "never", "always", or "controllable". The "controllable" value means the device's red-eye reduction is controllable by the user.

imageHeight

Returns an object indicating the image height range supported by the user agent.

imageWidth

Returns an object indicating the image width range supported by the user agent.

fillLightMode

Returns an array of available fill light options. Options include auto, off, or flash.

Exceptions

InvalidStateError DOMException

Thrown if readyState property of the MediaStreamTrack passing in the constructor is not live.

OperationError DOMException

Thrown if the operation can't complete for any reason.

Examples

The following example, extracted from Chrome's Image Capture / Photo Resolution Sample, uses the results from getPhotoCapabilities() to modify the size of an input range. This example also shows how the ImageCapture object is created using a MediaStreamTrack retrieved from a device's MediaStream.

const input = document.querySelector('input[type="range"]');

let imageCapture;

navigator.mediaDevices
  .getUserMedia({ video: true })
  .then((mediaStream) => {
    document.querySelector("video").srcObject = mediaStream;

    const track = mediaStream.getVideoTracks()[0];
    imageCapture = new ImageCapture(track);

    return imageCapture.getPhotoCapabilities();
  })
  .then((photoCapabilities) => {
    const settings = imageCapture.track.getSettings();

    input.min = photoCapabilities.imageWidth.min;
    input.max = photoCapabilities.imageWidth.max;
    input.step = photoCapabilities.imageWidth.step;

    return imageCapture.getPhotoSettings();
  })
  .then((photoSettings) => {
    input.value = photoSettings.imageWidth;
  })
  .catch((error) => console.error("Argh!", error.name || error));

Specifications

Browser compatibility