Weak quality functions to resize pictures?

I installed PHP 4.0.6 to test the functions imagecopyresized () and imagecopyresampled(). In documentation was information about implicit use of the bicubic interpolation algorithm within the function imagecopyresized (). I compared the result of the function with Adobe PhotoShop bicubic resized picture. The results from PHP function was very bad. It seemed to be like normal ordinary imagecopyresized (pixel replication algorithm). There is no smoothing recognizable. Which algorithm is used within the named functions? Here is my code : <? $im_in=ImageCreateFromJPEG("17960.jpg"); $size2=GetImageSize("17960.jpg"); $im_out_3=ImageCreate($size2[0]*3,$size2[1]*3); $im_out_4=ImageCreate($size2[0]*3,$size2[1]*3); ImageCopyResized($im_out_3,$im_in2,0,0,0,0,$size2[0]*3,$size2[1]*3,$size2[0],$size2[1]); ImageCopyResampled($im_out_4,$im_in2,0,0,0,0,$size2[0]*3,$size2[1]*3,$size2[0],$size2[1]); ImageJPEG($im_out_3,"larg3.jpg",100); ImageJPEG($im_out_4,"larg4.jpg",100); ImageDestroy($im_out_3); ImageDestroy($im_out_4); ImageDestroy($im_in2); $x2=$size2[0]*3; $y2=$size2[1]*3; ?> <img SRC="17960.jpg" border="0"> //1) oryginal picture <img SRC="17960.jpg" border="0" WITDH=<?echo $x2;?> HEIGHT=<?echo $y2;?>> //2) normal the ordinary imagecopyresized <img SRC="larg3.jpg" border="0"> //3) the result from the function ImageCopyResized() <img SRC="larg4.jpg" border="0">//4) the result from the function ImageCopyResampled() Results from point 3) , 4) 5) are exactly the same. I didnt find differences. In the Adobe application result was much better Anyone can say what is reason or anybody tested quality od this pictures. Best regards Tom -- --------------------------------------------------------------------------- Tomasz Rusc Mobile Phone: +49 175 550 175 9 E-mail: rusc@uni-wuppertal.de --------------------------------------------------------------------------- "The trouble with our times is that the future is not what it used to be" (Paul Valery)