Here is a different softwares resampling comparison.
Known softwares used: Photoshop CS, Irfanview 3.91 Genuine Fractals 3.5 and my PhotoResampling

All upsized images were saved in Bitmap format and then cropped.

Click on the original image to see the enlargement images comparision.

	Original image 150x150 pixel, 400% enlargement.
	Original image 128x128 pixel, 400% enlargement.

Original image 450x318 pixel, 400% enlargement