hasClass error

hasClass error

What am I, a beginner in jQuery, doing wrong?

$(document).ready(function() {
 $('img.pix4').each(function(index, image) {
    .....
    if (this.hasClass('xyz'))
    {
      console.log('img is in group xyz');
    }
});

I get an error:
Uncaught TypeError: Object #<HTMLImageElement> has no method 'hasClass'
Using image.getClass gives the same error. All other functions such as .getAttribute() work.