shyykoserhiy/canvas-png-compression

Shim for HTMLCanvasElement.toDataURL() to include compression for png image format.

canvas-png-compression's Issues

How do i use it ?

var url = this.canvas.toDataURL();

here is my code , it said replace the toDataURL , so how do i pass in the this canvas ?

this.canvas.CanvasPngCompression.replaceToDataURL();

CanvasPngCompression.replaceToDataURL(this.canvas);

both tested is not working, can i ask how to mke it work ? thank

Size increases when compressed

I replaced the demo with a <700 KB PNG image, and the best canvas-png-compression can do is to "compress" it to 1.3 MB! By not using canvas-png-compression I get 900 KB.

With canvas-png-compression Weight : 1341kb
With canvas-png-compression Time taken : 1000 ms
Without canvas-png-compression Weight : 859kb
Without canvas-png-compression Time taken : 230 ms

Am I doing something incorrectly?

This is the sample image: https://failiem.lv/u/ck6xnu4u

Problem using on ios 9

When I tried to compress the image using iOs 9 it throws the following error:

TypeError: r.slice is not a function. (In ‘r.slice(4, r.length - 4)‘, ‘r.slice’ is undefined)

It worked fine for iOs 10 and 11.

add a way to remove alpha chanel

add tests