Output high resolution PNG

[domoritz]

Hi, I'd like to output PNG images with a higher resolution.

I tried to scale the context but unfortunately that does not change the resolution of the generated PNG image. What do I need to change?

var ctx = canvas.getContext('2d');
ctx.scale(2, 2);

var stream = canvas.createPNGStream();
stream.on('data', function(chunk) { out.write(chunk); });

[LinusU]

You need to run .scale(2, 2) before you draw anything, it will only affect later calls. You should also double both the width and the height of your canvas...

[savely-krasovsky]

I did that you say and there is no any result, I just got bigger resolution with my old image in the left-top corner.