The takePhoto()
method of the
ImageCapture
interface takes a single exposure using the video capture
device sourcing a MediaStreamTrack
and returns a Promise
that resolves with a Blob
containing the data.
Syntax
const blobPromise = imageCaptureObj.takePhoto()
const blobPromise = imageCaptureObj.takePhoto(photoSettings)
Parameters
photoSettings
Optional- An object that sets options for the photo to be taken. The available options are:
fillLightMode
: The flash setting of the capture device, one of"auto"
,"off"
, or"flash"
.imageHeight
: The desired image height as an integer. The user agent selects the closest height value to this setting if it only supports discrete heights.imageWidth
: The desired image width as an integer. The user agent selects the closest width value to this setting if it only supports discrete widths.redEyeReduction
: A boolean indicating whether the red-eye reduction should be used if it is available.
Return value
Example
This example is extracted from this Simple
Image Capture demo. It shows how to use the Promise
returned by
takePhoto()
to copy the returned Blob
to an
<img>
element. For simplicy it does not show how to instantiate the
ImageCapture
object.
var takePhotoButton = document.querySelector('button#takePhoto');
var canvas = document.querySelector('canvas');
takePhotoButton.onclick = takePhoto;
function takePhoto() {
imageCapture.takePhoto().then(function(blob) {
console.log('Took photo:', blob);
img.classList.remove('hidden');
img.src = URL.createObjectURL(blob);
}).catch(function(error) {
console.log('takePhoto() error: ', error);
});
}
Specifications
Specification | Status | Comment |
---|---|---|
MediaStream Image Capture The definition of 'takePhoto()' in that specification. |
Working Draft | Initial definition. |
Browser compatibility
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