getimagedata

I am trying to read an entire .pdf Document using PDF.js and then render all the pages on a single canvas. My idea: render each page onto a canvas and get the ImageData (context.getImageData()), clear the canvas do the next page. I store all the ImageDatas in an array and once all pages are in there I want to put all the ImageDatas from the array onto a single canvas. var pdf = null; PDFJS.disableWorker = true; var pages = new Array(); //Prepare some things var canvas = document.getElementById('cv'); var context = canvas.getContext('2d'); var scale = 1.5; PDFJS.getDocument(url).then(function

I have a canvas in my webpage; I create a new Image data in this canvas then I modify some pixel through myImgData.data[] array. Now I would like to scale this image and make it bigger. I tried by scaling the context but the image remains small. Is it possible to do this? Thanks You could draw the imageData to a new canvas, scale the original canvas and then draw the new canvas to the original canvas. Something like this should work: var imageData = context.getImageData(0, 0, 100, 100); var newCanvas = $("<canvas>") .attr("width", imageData.width) .attr("height", imageData.height)[0];

I'm trying to add a photo from galery to a ImageView but I get this error: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://media/external/images/media/1 }} to activity {hotMetter.pack/hotMetter.pack.GetPhoto}: java.lang.NullPointerException This is my code: Intent intent = new Intent(); intent.setType("image/*"); intent.setAction(Intent.ACTION_GET_CONTENT); startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECT_PICTURE); } Bitmap bitmap=null; public void onActivityResult(int requestCode, int