Thumbnails

lib_image.php
Type:	code fragment
Added by:	iGoR75
Entered:	16/05/2002
Last modified:	05/12/2001
Rating:	- (fewer than 3 votes)
Views:	7754
A Function which allows you to create proportional Thumbnails with some features: works with JPG/Gif requires GD 1.6 or higher - grayscale [on | off] - Border with Bordercolor [on | off] - antialiasing [on | off] (GD 2.x, JPG only) - interlace [on | off] (nice effect)
<?
 #####################################################################################

                            #                        Class lib_image - Philipp Wiegel 2002


                            #                        mailto: pwiegel@visio-interactive.de


                            #                        http://www.visio-interactive.de


                            #Usage: createthumb( Resource File with absolut path,

                            #             Destination file with absolut path,

                            #             Proportional width (height is calculated),

                            #             Bordersize in Pixel e.g. 1

                            #             Bordercolor in HEX! e.g. 000000  without "#"

                            #             antialias [0|1],

                            #             gray [0|1] for grayscaling the Thumb,

                            #             rasterize [0|1] nice looking effect with interlaced lines);


                            #

                            #    Email me with questions and comments: pwiegel@visio-interactive.de

                            #    known BUG: bordercolors sometimes go crazy..... no time to fix this, maybe

                            #    anyone could do this. Don't forget to mail the code back to me then :)

                            #####################################################################################

                                

                                function hex2rgb($hex)

                                {

                                    $r=substr($hex,0,2);

                                    $g=substr($hex,2,2);

                                    $b=substr($hex,4,2);

                                    $a[1]=hexdec($r);

                                    $a[2]=hexdec($g);

                                    $a[3]=hexdec($b);

                                    return $a;

                                }

                                function create_thumb($resource, $dest, $x_scale, $bordersize = NULL, $bordercolor = NULL, $antialias = NULL, $gray = NULL, $rasterize = NULL)

                                {

                                        $check     = GetImageSize($resource);

                                        $factor = $check[0]/$check[1];

                                        $y_scale= floor($x_scale/$factor);

                                        $im_dest= ImageCreate($x_scale,$y_scale);

                                        if ($check[2] == "2")

                                        {    $im_src = ImageCreateFromJPEG($resource); }

                                        if ($check[2] == "1")

                                        {    $im_src = ImageCreateFromGIF($resource); }

                                        

                                        if ($im_src)

                                        {

                                              if (isset($antialias) and $antialias == "1")

                                            { ImageCopyResampled($im_dest,$im_src,0,0,0,0,$x_scale,$y_scale,$check[0],$check[1]); }

                                            else

                                            { ImageCopyResized($im_dest,$im_src,0,0,0,0,$x_scale,$y_scale,$check[0],$check[1]); }

                                            if (isset($bordersize) and !empty($bordersize))

                                            {

                                              if (isset($bordercolor) and !empty($bordercolor))

                                              { 

                                                  $col = hex2rgb($bordercolor); 

                                                $col = ImageColorAllocate($im_dest,$col[1],$col[2],$col[3]);

                                                ImageRectangle($im_dest,0,0,$x_scale-1,$y_scale-1,$col);

                                              }

                                              }

                                            if (isset($gray) and $gray == "1") { ImageCopyMergeGray($im_dest,$im_dest,0,0,$x_scale,$y_scale,$check[0],$check[1],30); }

                                            

                                            if (isset($rasterize) and $rasterize == "1") 

                                            { 

                                                for ($i=2; $i<=$y_scale-2; $i++)

                                                { ImageLine($im_dest,0,$i,$x_scale,$i,10); $i++; }

                                            }

                                        }

                                        if ($check[2] == "2")

                                        { if (ImageJPEG($im_dest,$dest)) { return true; } }

                                        if ($check[2] == "1")

                                        { if (ImageGIF($im_dest,$dest)) { return true; } }

                                        

                                        ImageDestroy($im_dest);

                                        ImageDestroy($im_src);

                                }
 ?>
Usage Example
createthumb("test.jpg","test_thumb.jpg",1,"000000",0,1,1);
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