PHP中实现图片的锐化

　　<? 　　//读取图像的类型 　　//1 = gif, 2 = jpg, 3 = png, 4 = swf, 5 = psd, 6 = bmp, 7 = tiff(intel byte order), 8 = tiff(motorola byte order), 9 = jpc, 10 = jp2, 11 = jpx, 12 = jb2, 13 = swc, 14 = iff 　　function getimagetype($filename) {return (($imginfo=@getimagesize($filename))!=null ? $imginfo[2] : null);} 　　 　　...