When I first uploaded my custom header it was about 60k .png image. After the crop it got turned into a .jpg file at about 15k. I can understand that it may have something to do with bandwidth consumption, but the quality is horrible.
Next, I took my original picture and reduced it to about 15k, but when I uploaded that one it still got degraded. Why is this happening? And whiy do I have to crop an image that is already 750x140 pix (Contempt theme)?