PHP Make image sharpening processing

<?php//Read the type of image//1=gif,2=jpg,3=png,4=swf,5=psd,6=bmp,7=tiff (Intelbyteorder), 8=tiff (Motorolabyteorder), 9=JPC,10=JP2,11=JPX , 12=jb2,13=swc,14=iff function getimagetype($filename){return(($imginfo[Email protected] ($filename))!=NULL?
$imginfo[2]:NULL);}//Image Sharpening//$SCR _im: Image resource handle, $degree: Sharpening degrees function Sharp (&$src _im,&$dst _im,$degree) {$src _x= Imagesx ($src _im);$src _y= Imagesy ($src _im);//$dst _im=imagecreate ($src _x, $src _y);//imagecopy ($dst _im, $src _im,0,0,0,0, $src _x, $src _y);$cnt=0; for($x=1;$x<$src _x;$x++) for($y=1;$y<$src _y;$y++){/*imagecolorsforindex---Get color syntax from index values: array imagecolorsforindex (int im, int index) Description: This function returns the RGB value of the specified color index value, and the returned array has a red , green, and blue three index values, the value of the array is the RGB value of the specified color index value. Imagecolorat---Gets the color index value syntax for the pixel: int imagecolorat (int im, int x, int y) Description: Returns the color index value of the pixel at the specified position in the drawing. */$src _CLR1= Imagecolorsforindex ($src _im, Imagecolorat ($src _im,$x-1,$y-1));$src _CLR2= Imagecolorsforindex ($src _im, Imagecolorat ($src _im,$x,$y));$r= Intval ($src _CLR2["Red"] +$degree*($src _CLR2["Red"] -$src _CLR1["Red"]));$g= Intval ($src _CLR2["Green"] +$degree*($src _CLR2["Green"] -$src _CLR1["Green"]));$b= Intval ($src _CLR2["Blue"] +$degree*($src _CLR2["Blue"] -$src _CLR1["Blue"]));$r= Min (255, Max ($r,0));$g= Min (255, Max ($g,0));$b= Min (255, Max ($b,0));//echo "R: $r, G: $g, B: $b <br/>";if(($DST _clr=imagecolorexact ($DST _im,$r,$g,$b))==-1)$DST _clr=imagecolorallocate ($DST _im,$r,$g,$b);$cnt++;if($DST _clr==-1) die("colorallocatefaileat$x, $y ($cnt)."); Imagesetpixel ($DST _im,$x,$y,$DST _clr);}return $DST _im;}$ImageFunctions=Array("Imagecreatefromwbmp","Imagecreatefromgif","Imagecreatefromjpeg","Imagecreatefrompng");if(!Empty($_post["ImageName"]) {Set_time_limit (Ten* -);if(($ImageType= Getimagetype ($_post["ImageName"]))==false) die("The specified file does not exist or is not a valid picture or unsupported type. ");if($ImageType==6)$ImageType=0;if($ImageType>3) die("Unsupported picture Type! 
");$im 1=$ImageFunctions[$ImageType]($_post["ImageName"]);$im 2=$ImageFunctions[$ImageType]($_post["ImageName"]);//print_r (Imagecolorsforindex ($im, Imagecolorat ($im, 10,10)));Sharp ($im 1,$im 2,$_post["Degree"]); Header ("Content-type:image/png"); Imagepng ($im 2); Imagedestroy ($im 1); Imagedestroy ($im 2);}?><form name= "FormName" action= " method=" Post ">Please enter a local path or URL for the picture:<br/><input name="ImageName" type="text" value="< =$_post["ImageName"]? >"Size=32><br/>Degree of sharpening (example: 0.6, 3.0):<br/><input name="degree" type="text" value= "<? 
=$_post["degree"]?
>"><br/><input type="submit" value="提交"></form>

PHP Make image sharpening processing