imagejpeg() problem

hi! I have a problem with the imagejpeg() function - or related. I must specify that I'm a newbie with image handling with php and that a piece of advice would really help me right now. The deal is that I want to create a (smaller) resized copy of a certain image using this code: $veche = imagecreatefromjpeg($img_large); $noua = imagecreate($wm, $hm); imageinterlace($noua, 1); imageinterlace($veche, 1); imagecopyresized($noua, $veche, 0, 0, 0, 0, $wm, $hm, $size_large[0], $size_large[1]); imagejpeg($noua, $smallPath, 100); ImageDestroy($veche); ImageDestroy($noua); the resizing part goes well; I don't really know what the imageinterlace function does, but I used it in desperation. Why: the output image's quality is visibly inferior to the source's. And I want the image to look good. The source is a jpeg (dinamic). As you probably have noticed, I set the quality parameter to 100, but uselessly. What i'd like to know is whether php can output some quality jpegs, and if so, then how? Thanks a lot!