Resizing image without losing quality

Question

I have developed a site in WordPress using the Firebird theme. The slider image is going to squeeze in a smaller resolution.

Take a look at this image .

It is going to squeezing - see http://theme-dutch.com/presents/firebird/ . Can we avoid it squeezing by resizing it dynamically? Is there a way to resize the image according to user resolution at run time, and is it a good practice or not?

Answer 1

The problem was with the theme slider. It was going to enlarge the image to more the 1900px. so the image was going to loss the quality. I have decrese the value which solve the problem almost