HTML5 - resize image and keep EXIF in resized image

Question

How can I resize an image (using an HTML5 canvas element) and keep the EXIF information from the original image? I can extract EXIF info from from original imag

Answer 1

It looks my code is used in 'ExifRestorer.js'...

I've try resizing image by canvas. And I felt that resized image is bad quality. If you felt so, too, try my code. My code resizes JPEG by bilinear interpolation. Of course it doesn't lose exif.

https://github.com/hMatoba/JavaScript-MinifyJpegAsync

function post(data) {
    var req = new XMLHttpRequest();
    req.open("POST", "/jpeg", false);
    req.setRequestHeader('Content-Type', 'image/jpeg');
    req.send(data.buffer);
}

function handleFileSelect(evt) {
    var files = evt.target.files;

    for (var i = 0, f; f = files[i]; i++){
        var reader = new FileReader();
        reader.onloadend = function(e){
            MinifyJpegAsync.minify(e.target.result, 1280, post);
        };
    reader.readAsDataURL(f);
    }
}

document.getElementById('files').addEventListener('change', handleFileSelect, false);