Pdf image quality is bad using pdf.js

Question

I am using pdf.js.

But, image quality of PDF is low quality.

Please tell me solution method.

var TARGET_PAGE = 1; 
var PAGE_SCALE = 1; 

function         


        

Answer 1

I let it work by zooming the scale in getViewport, an then de-zooming the canvas with css style:

var viewport = page.getViewport(10);//paint with zoom 10X to reach "high definition" PDF drawing
canvas.width = viewport.width;//keep high definition drawing canvas
canvas.style.width = "100%";//de-zoom canvas with style (maybe you can directly use CSS), reaching de-zoom of higher definition PDF