Dynamic creating of images

Hi, I have modified pnglet for Titanium. Here is modified code.

I have added this method to generate Ti.Blob from output string:

Pnglet.prototype.getBlob = function() {
    var temp = Ti.Filesystem.createTempFile();
    temp.write(this._output());
    return temp.read();
};

Here is my example code:

var TiPnglet = require('vendor/tipnglet');
var p = new TiPnglet(800,200,8);
var green = p.color( 0,255,  0);
p.line(green, 2,2, 32,16, 16,32, 4,7);      
return p.getBlob();

But the image view stay empty. Has anybody experiences with pnglet? It is very old, but I want avoid canvas (webview)

Best regards

Rainer