Javascript Blob upload is corrupted -

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so have code modifies image file , converts new image.

the new image (represented canvas.todataurl() ) working perfectly, conversion blob generating corrupted images.

var reader = new filereader();  reader.onload = function (e) {     var canvas = document.createelement("canvas");     var context = canvas.getcontext("2d");     var imageobj = new image();     imageobj.src = e.target.result;     imageobj.onload = function () {         canvas.width = this.width;         canvas.height = this.height;          context.drawimage(imageobj, 0, 0);         context.textalign = 'right';         context.fillstyle = "#fff";         context.font = "15pt calibri";         context.filltext(new date().tolocalestring(), this.width - 30, this.height - 30);          var blb = new blob( [canvas.todataurl()],  {type: 'image/jpeg', encoding: 'utf-8'});         buildingservice.addfile({file: blb, filename: guid});         category.pictures.push({offlinefoto: canvas.todataurl(), filenameondevice: guid});     }; }; reader.readasdataurl(file);

the images noticable bigger 1 started with, startsize = 858kb, converted = 2.107kb


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