pdf.js change background color
var url = '//cdn.mozilla.net/pdfjs/helloworld.pdf';
PDFJS.workerSrc = '//mozilla.github.io/pdf.js/build/pdf.worker.js';
var loadingTask = PDFJS.getDocument(url);
loadingTask.promise.then(function(pdf) {
var pageNumber = 1;
pdf.getPage(pageNumber).then(function(page) {
console.log('Page loaded');
var scale = 1.5;
var viewport = page.getViewport(scale);
// Prepare canvas using PDF page dimensions
var canvas = document.getElementById('the-canvas');
var context = canvas.getContext('2d');
canvas.height = viewport.height;
canvas.width = viewport.width;
// Render PDF page into canvas context
var renderContext = {
canvasContext: context,
// Use transparent background!
background: 'rgba(0,0,0,0)',
viewport: viewport
};
var renderTask = page.render(renderContext);
renderTask.then(function () {
console.log('Page rendered');
});
});
}, function (reason) {
// PDF loading error
console.error(reason);
});