resizing images - newbie help needed

Anon

I am a total newbie at resizing files that are uploaded via a form.

I want to resize the images so that there are thumbnails and normal images, named appropriately.

They need to be resized to make them 250 wide, but maintain the aspect ratio so they cannot be restricted to x in height.

Any idea how I can do this? most example code is for absolute image resizing and my code doesn't work =(

i can't even seem to get fopen working. Any help greatly appreciated, even if just pointing me to a tutorial

khaine

Have a look at

http://www.phpbuilder.com/snippet/detail.php?type=snippet&id=574

It take images in the current directory and creates a file thumb_filename.ext in a subdirectory called thumbnails.

It only does png images but you can easily change the image functions createimagefrompng and imagepng to use gif's, bmp's or jpg's. The functions are in the manual.
Alternatively if you are on linux you can use the convert command to change the images to a png format.

Mark.

Anon

Are you using GD or a program like ImageMagick ?

khaine

I use the gd library with png support. Ive heard about imagemagick but Ive not been able to get a copy.

Mark.

Anon

actually a kind french guy helped me out, I wrote the following function (using GD library - no gif support =( )

here is my functions, one for uploading, then one for resizing then one to delete.

it is a little messy, and it uses a switch called $type to make the suffix (not a prefix) on the file changed, which is far better when storing images in my opinion.

// **********************************************
// Image uploader, uploads $img and $img_name to $abpath
// **********************************************
function fileUpload($img,$img_name,$abpath,$debug)
{
//user defined variables
// $abpath is absolute path to where images are uploaded. No trailing slash eg $abpath = "/usr/local/etc/httpd/vhosts/user/somewhere";
$url = "http://www.civicvideo.co.nz/tempupload or whatever"; //Url to where images are uploaded. No trailing slash
$sizelim = "no"; //Do you want size limit, yes or no
$size = "60000"; //What do you want size limited to be if there is one
if($debug==1){echo"Path=$abpath URL:$urlImage:$imgImage_name: $img_nameImg_size:$img_size";}

//checks if file was selected to upload
if ($img == 'none') {
echo("No image selected for upload.<br>");
}
else
{
if ($sizelim == "yes") {
if ($img_size > $size) {
die("<b>Error</b> The file you are trying to upload must be $size or smaller");
}
}
//checks if file exists
//if (file_exists("$abpath/$img_name")) {
//unlink("$abpath/$img_name");
//}
copy("$img", "$abpath/$img_name") or die("<b>Error:</b> Directory Not Created or chmod correctly");
echo"Image Successfully Uploaded ($abpath/$img_name)<br>";
}

}

// **********************************************
// Image Resizer, resizes the width and the rest of the image
// follows in proportion
// **********************************************

function resize_image($image_name,$new_width,$type,$action,$debug){

$PicPathIn="/path to temporary directory where you uploaded the file, usually $abpath in the above function/";
}
$PicPathOut2="/where you are saving the resized files to/";
// Picture
$bild="$image_name";

// fileprefix
$tn=$prefix;
$neueBreite=$new_width; //New width

$size=getimagesize("$PicPathIn"."$bild");
$breite=$size[0];
$hoehe=$size[1];
$neueHoehe=intval($hoehe*$neueBreite/$breite);

if($size[2]==1) {
// GIF
$altesBild=ImageCreateFromGIF("$PicPathIn"."$bild");
$neuesBild=ImageCreate($neueBreite,$neueHoehe);
ImageCopyResized($neuesBild,$altesBild,0,0,0,0,$neueBreite,
$neueHoehe,$breite,$hoehe);

if($type==video_sml){$bild2 = ereg_replace(".gif","sml.gif", $bild);}
elseif($type==video){$bild2 = ereg_replace(".gif","big.gif", $bild);}
elseif($type==game){$bild2 = ereg_replace(".gif","_gme.gif", $bild);}
ImageGIF($neuesBild,"$PicPathOut$bild");
}

if($size[2]==2) {
// JPG
$altesBild=ImageCreateFromJPEG("$PicPathIn"."$bild");
$neuesBild=ImageCreate($neueBreite,$neueHoehe);
ImageCopyResized($neuesBild,$altesBild,0,0,0,0,$neueBreite,
$neueHoehe,$breite,$hoehe);
if($type==video_sml){$bild2 = ereg_replace(".jpg","sml.jpg", $bild);}
elseif($type==video){$bild2 = ereg_replace(".jpg","big.jpg", $bild);}
elseif($type==game){$bild2 = ereg_replace(".jpg","_gme.jpg", $bild);}
ImageJPEG($neuesBild,"$PicPathOut$bild2");
}

if($size[2]==3) {
// PNG
$altesBild=ImageCreateFromPNG("$PicPathIn"."$bild");
$neuesBild=ImageCreate($neueBreite,$neueHoehe);
ImageCopyResized($neuesBild,$altesBild,0,0,0,0,$neueBreite,
$neueHoehe,$breite,$hoehe);
if($type==video_sml){$bild2 = ereg_replace(".png","sml.png", $bild);}
elseif($type==video){$bild2 = ereg_replace(".png","big.png", $bild);}
elseif($type==game){$bild2 = ereg_replace(".png","_gme.png", $bild);}
ImagePNG($neuesBild,"$PicPathOut$bild2");
}
if($debug==1){
echo "Old Picture: ";
echo "<IMG SRC=\"tempup/$bild\" WIDTH=\"$breite\" HEIGHT=\"$hoehe\">
 ";
echo "New Picture: ";
echo "<IMG SRC=\"slicks/$bild2\" WIDTH=\"$neueBreite\" HEIGHT=\"$neueHoehe\">";
}
//if($action=='delete')
//{
//if (file_exists("$PicPathIn/$image_name"))
// {
//$file_unlink="$PicPathIn$image_name";
//if($debug==1){echo"file_unlink=$file_unlink";}
//unlink("$file_unlink");
// }
//}
// close function resize_image
echo"Image $bild2 created and resized to width $neueBreite ";
}
//***************************************************************************
function delete_image($img_name,$abpath,$debug){
if(file_exists("$abpath/$img_name"))
{
unlink("$abpath/$img_name");
echo"File $img_name deleted ";
}else{echo"File $img_name doesn't exists, cannot delete ";}
}