Image Resize

[SieRobin]

I've been looking into this for a few hours now and I can't seem to figure it out, so here I am asking you for help :P

Alright I have it set so you can upload one image which will be your profile image and your forum post image, how exactly do I set it so that it resizes the image in the forum so it doesn't pass 150x150? Pixels that is. Basically I want to do this so it doesn't show so huge, and rather just like a thumbnail.

Any provided information is appreciated.

[zq29]

You could try the GD function imagecopyresampled() - Check the manual, it gives examples on its use.

[SieRobin]

I had looked at the manual, but I still can't seem to figure it out, it just makes little sense to me, so if someone could make sense of it to me, I'd appreciate that lol. I guess all I want is something like this.

If the original size of the image succeeds 150x150 rescale the image so it's not over 150x150.

[wisewood]

you'll have to excuse my not explaining how this work... its something i put together about 18 months ago and have never gotten around to using properly.

It's all pretty straight forward...
$album is the subfolder within the images directory
$image is the filename of the image you want to work with

Both of these are to be specified in the URL. However, you can just ditch that and use the $img_name variable to specify it directly.

Hope this helps, sorry i can't be of any further use.


[code]
<?php
$album = $_GET['album'];
$image = $_GET['image'];

$img_name = "images/$album/$image";
$max_width    = 150; // maximum x aperture  in pixels
$max_height   = 150; // maximum y aperture in pixels
$size=GetImageSize($img_name);
$width_ratio  = ($size[0] / $max_width);
$height_ratio = ($size[1] / $max_height);

if($width_ratio >=$height_ratio)
{
   $ratio = $width_ratio;
}
else
{
   $ratio = $height_ratio;
}

$new_width    = ($size[0] / $ratio);
$new_height   = ($size[1] / $ratio);
Header("Content-Type: image/jpeg");
$src_img = ImageCreateFromJPEG($img_name);
$thumb = ImageCreateTrueColor($new_width,$new_height);
ImageCopyResampled($thumb, $src_img, 0,0,0,0,($new_width-1),($new_height-1),$size[0],$size[1]);
ImageJPEG($thumb);
ImageDestroy($src_img);
ImageDestroy($thumb);
?>
[/code]

[SieRobin]

I get like a series of errors from that hehe.

[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]Warning: getimagesize(): Read error! in /home/sierobin/public_html/forum.php on line 76

Warning: Division by zero in /home/sierobin/public_html/forum.php on line 89

Warning: Division by zero in /home/sierobin/public_html/forum.php on line 90

Warning: Cannot modify header information - headers already sent by (output started at /home/sierobin/public_html/forum.php:7) in /home/sierobin/public_html/forum.php on line 91

Warning: imagecreatefromjpeg(): gd-jpeg: JPEG library reports unrecoverable error: in /home/sierobin/public_html/forum.php on line 92

Warning: imagecreatefromjpeg(): '/' is not a valid JPEG file in /home/sierobin/public_html/forum.php on line 92

Warning: imagecreatetruecolor(): Invalid image dimensions in /home/sierobin/public_html/forum.php on line 93

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /home/sierobin/public_html/forum.php on line 94

Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/sierobin/public_html/forum.php on line 95

Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/sierobin/public_html/forum.php on line 96

Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/sierobin/public_html/forum.php on line 97[/quote]

[kenrbnsn]

Only the first message is relevant:
[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]Warning: getimagesize(): Read error! in /home/sierobin/public_html/forum.php on line 76[/quote]
This means the function couldn't read the input file in this line:
[code]<?php $size=GetImageSize($img_name); ?>[/code]
Does the variable $img_name contain a name of a valid file that the webserver can read?

All the other errors are caused by the first one.

Ken

[SieRobin]

Yes it is, hmmn.

[SieRobin]

Ok so I changed around a few things that I thought were wrong just to see if that was it. But not I just get jibberish haha.

[code]$img_name = "userimages/$pstats3[uimage]";
$max_width    = 150; // maximum x aperture  in pixels
$max_height   = 150; // maximum y aperture in pixels
$size=getimagesize($img_name);
$width_ratio=($size[0] / $max_width);
$height_ratio =($size[1] / $max_height);

if($width_ratio>=$height_ratio)
{
   $ratio=$width_ratio;
}
else
{
   $ratio=$height_ratio;
}
$new_width=($size[0] / $ratio);
$new_height=($size[1] / $ratio);
header("Content-Type: image/jpeg");
$src_img = imagecreatefromjpeg($img_name);
$thumb = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($thumb, $src_img, 0,0,0,0,($new_width-1),($new_height-1),$size[0],$size[1]);
imagejpeg($thumb);
imagedestroy($src_img);
imagedestroy($thumb);[/code]

And now I get this.

[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]Warning: Cannot modify header information - headers already sent by (output started at /home/sierobin/public_html/forum.php:7) in /home/sierobin/public_html/forum.php on line 89
ÿØÿàJFIF



ÿþ>CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality ÿÛC    $.' ",#(7),01444'9=82<.342ÿÛC
 2!!22222222222222222222222222222222222222222222222222ÿÀ–p
"

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èA¯Hð÷Å{iôÄ·û BaP¥WzWˆj—)qª<‘°eÆÁ|°Û?Ç#ÚŠ+3NgkªH5ÔøgÄúfŽ#ûT/‰·¿–ªr¼qËCEq܆M¯x³JÔ#–;.ãF?8"Œxá?bE«Û¨!£~xÝ€HLÑEŽãÞ/ð?©-õ–µ{r9!¢?Ëéæsø×t>?xYWjéÚÀP0†/þ9E†ŽK[øÇo¬3/‘y¿ðÄqøüÜ×#¨ø¶ÊúÒá WY#dMʸ\ŒzÑE [/quote]

[kenrbnsn]

The gibberish is really the picture being displayed as printable characters. The error saying [!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]Warning: Cannot modify header information - headers already sent by (output started at /home/sierobin/public_html/forum.php:7) [/quote] is the reason. What is on line 7 of forum.php?

How are you invoking the script to display the image?

Ken

[SieRobin]

Line 7 is just <?php

Uhmn basically I'm just posting the image, with an HTML tag, <img src and such. How should I do it?

[kenrbnsn]

Please post the code you're using. Do you have anything before the "<?php"?

Ken

[wisewood]

when you use a valid image, this script does work. I've just tested it with an image thats on my own domain... from my local machine.

[code]
<?php
$img_name = "http://www.wisewood.org/blog/images/burger.jpg";
$max_width    = 100; // maximum x aperture  in pixels
$max_height   = 100; // maximum y aperture in pixels
$size=GetImageSize($img_name);
$width_ratio  = ($size[0] / $max_width);
$height_ratio = ($size[1] / $max_height);

if($width_ratio >=$height_ratio)
{
   $ratio = $width_ratio;
}
else
{
   $ratio = $height_ratio;
}

$new_width    = ($size[0] / $ratio);
$new_height   = ($size[1] / $ratio);
Header("Content-Type: image/jpeg");
$src_img = ImageCreateFromJPEG($img_name);
$thumb = ImageCreateTrueColor($new_width,$new_height);
ImageCopyResampled($thumb, $src_img, 0,0,0,0,($new_width-1),($new_height-1),$size[0],$size[1]);
ImageJPEG($thumb);
ImageDestroy($src_img);
ImageDestroy($thumb);
?>
[/code]

[SieRobin]

Yes there is script before <?php and this is what is shown.

[code]<?php
session_start();
include 'connect.php';
?>
<link rel="stylesheet" href="style.css" type="text/css">
<title>Feudal Age - Forum</title>[/code]

The script I have is shown as this.

[code]$img_name = "userimages/$pstats3[uimage]";
$max_width    = 150; // maximum x aperture  in pixels
$max_height   = 150; // maximum y aperture in pixels
$size=getimagesize($img_name);
$width_ratio=($size[0] / $max_width);
$height_ratio =($size[1] / $max_height);

if($width_ratio>=$height_ratio)
{
   $ratio=$width_ratio;
}
else
{
   $ratio=$height_ratio;
}
$new_width=($size[0] / $ratio);
$new_height=($size[1] / $ratio);
header("Content-Type: image/jpeg");
$src_img = imagecreatefromjpeg($img_name);
$thumb = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($thumb, $src_img, 0,0,0,0,($new_width-1),($new_height-1),$size[0],$size[1]);
imagejpeg($thumb);
imagedestroy($src_img);
imagedestroy($thumb);[/code]

[kenrbnsn]

The way this script is written, you should be invoking it something like this:
[code]
<img src="yourscripthere.php?fn=<?echo userimages/$pstats3['uimage'] ?>">
[/code]
Then in [b]yourscripthere.php[/b]
[code]<?php
session_start();
if (isset($_GET['fn'])) {
   $img_name = $_GET['fn'];
//
// etc...
//
   imagedestroy($thumb);
   exit();
}
?>[/code]

Ken

[SieRobin]

Ah, well the way I need it done is to be inserted into a forum. Everyone has a picture next to their name when they post a message, so how would it still be done?

[kenrbnsn]

Yes, that's how to do it.

Ken

[SieRobin]

Ok well let me give it a go, one second.

[SieRobin]

Well now the pictures don't show at all.. hmmn.

[kenrbnsn]

Please post all of you code so we can see what you're doing.

Ken

[SieRobin]

Ok this is what's in forum.php, I prefer to keep my forums all in one page, it just saves me time.

[code]<?php
session_start();
include 'connect.php';
?>
<link rel="stylesheet" href="style.css" type="text/css">
<title>Feudal Age - Forum</title>
<?php
include "navigate.php";
if (isset($_SESSION['player']))
  {
  $player=$_SESSION['player'];
  $userstats="SELECT * from users where playername='$player'";
  $userstats2=mysql_query($userstats) or die("Could not retrieve the users stats.");
  $userstats3=mysql_fetch_array($userstats2);
  $brd=$_GET['brd'];
  $msg=$_GET['msg'];
  $thread="SELECT * from f_thread where bname='$brd' AND ID='$msg' order by timep DESC";
  $thread2=mysql_query($thread) or die ("Could not display threads");
  $thread3=mysql_fetch_array($thread2);        
  $pstats="SELECT * from users where ID='$thread3[UID]'";
  $pstats2=mysql_query($pstats) or die("Could not display quote");
  $pstats3=mysql_fetch_array($pstats2);        
  $post="SELECT * from f_post where bname='$brd' AND msg='$msg' order by ID ASC";
  $post2=mysql_query($post) or die ("Could not display threads");
  $post3=mysql_fetch_array($post2);
  $reply=$_POST['reply'];
  $title=$_POST['title'];
  $postr=$_POST['post'];
  $sreply=$_POST['sreply'];  
  $spost=$_POST['post'];
  $titlet=$_POST['titlet'];
  $postt=$_POST['postt'];
  $sthread=$_POST['sthread'];
  $delete=$_GET['del'];
  $deletet=$_GET['del'];
  $nowtime=time();
if (isset($deletet)) {
    print "<table class='table'><tr class='headline'><td align='center'>Delete</td></tr>
    <tr class='mainrow'><td align='center'>You have successfully deleted your thread.<br>
    <a href='forum.php?brd=$brd'>Back To Board</a></tr></td></table>";
    mysql_query("DELETE from f_thread where ID='$deletet'") or die ("Could not delete.");
    mysql_query("DELETE from f_post where msg='$deletet'") or die ("Could not delte.");
    }
elseif (isset($delete)) {
    print "<table class='table'><tr class='headline'><td align='center'>Delete</td></tr>
    <tr class='mainrow'><td align='center'>You have successfully deleted your reply.<br>
    <a href='forum.php?brd=$brd'>Back To Board</a></tr></td></table>";
    mysql_query("DELETE from f_post where ID='$post3[ID]'") or die ("Could not delete.");
    }
elseif (isset($sthread)) {
    print "<table class='table'><tr class='headline'><td align='center'>Reply</td></tr>
    <tr class='mainrow'><td align='center'>Your thread has been posted.<br>
    <a href='forum.php?brd=$brd'>Back To Board</a></tr></td></table>";
    mysql_query("INSERT f_thread set author='$userstats3[playername]', UID='$userstats3[ID]', title='$titlet', post='$postt', bname='$brd', timep='$nowtime'") or die ("Could not post reply");
    }
elseif (isset($sreply)) {
    mysql_query("UPDATE f_thread set replies=replies+1, lastpost='$userstats3[playername]', LUID='$userstats3[ID]', timep='$nowtime' where bname='$brd' AND ID='$msg'") or die("Could not log views");
    print "<table class='table'><tr class='headline'><td align='center'>Reply</td></tr>
    <tr class='mainrow'><td align='center'>Your reply has been posted.<br>
    <a href='forum.php?brd=$brd&msg=$msg'>Back To Thread</a><br>
    <a href='forum.php'>Back To Forum</a></tr></td></table>";
    mysql_query("INSERT f_post set author='$userstats3[playername]', UID='$userstats3[ID]', title='$title', post='$postr', bname='$brd', msg='$msg', timep='$nowtime'") or die ("Could not post reply");
        }  
  elseif (isset($msg)) {
          mysql_query("UPDATE f_thread set views=views+1 where bname='$brd' AND ID='$msg'") or die("Could not log views");
          $post="SELECT * from f_post where bname='$brd' AND msg='$msg' order by ID ASC";
        $post2=mysql_query($post) or die ("Could not display threads");
        print "<table class='table'><tr class='headline'><td colspan='2'><center>Forum</center></td></tr>
        <tr class='mainrow'><td bgcolor='ababab' width='20%' rowspan='2' class='mainrowf'><a href='profile.php?id=$thread3[UID]'>";
        if ($pstats3['uimage']=="") {
        print "<center><font color='green'>No Photo</font></center>";
        } else {
        print "<center><img src='image.php?img=userimages/$pstats3[uimage]' border='0'></center><br>";
        }
        print "$thread3[author]</a><br>
        Race: $pstats3[race]<br>Level: $pstats3[level]</td><td class='mainrowb'>$thread3[title]</td></tr>
        <tr class='mainrow'><td>$thread3[post]<br>";
        if ($userstats3['ID']==$thread3['UID']) {
        print "<div align='right'>[<a href='forum.php?brd=$brd&del=$thread3[ID]'>Delete</a>]";
        }
        print "<hr width='80%'>
        $pstats3[quote]</td></tr>
        <tr height='10' class='headline'><td colspan='2'></td></tr>";
        while  ($post3=mysql_fetch_array($post2)) {
        $stats="SELECT * from users where ID='$post3[UID]'";
          $stats2=mysql_query($stats) or die("Could not display quote");    
          $stats3=mysql_fetch_array($stats2);
        print "<tr class='mainrow'><td bgcolor='ababab' width='20%' rowspan='2' class='mainrowf'><a href='profile.php?id=$post3[UID]'>";
        if ($stats3['uimage']=="") {
        print "<center><font color='green'>No Photo</font></center>";
        } else {
        print "<center><img src='image.php?img=userimages/$stats3[uimage]' border='0'></center><br>";
        }
        print "$post3[author]</a><br>
        Race: $stats3[race]<br>Level: $stats3[level]</td><td class='mainrowb'>$post3[title]</td></tr>
        <tr class='mainrow'><td>$post3[post]<br>";
        if ($userstats3['ID']==$post3['UID']) {
        print "<div align='right'>[<a href='forum.php?brd=$brd&msg=$msg&del=$post3[ID]'>Delete</a>]";
        }
        print "<hr width='80%'>
        $stats3[quote]</td></tr>
        <tr height='10' class='headline'><td colspan='2'></td></tr>";
        }
        print "</table><br>
        <table class='otable'><tr class='headline'><td><center>Reply</center></td></tr>
        <tr class='mainrow'><td><form name='reply' method='post'>Title: <input type='text' size='59' name='title' value='None'><br>
        <textarea cols='65' rows='9' name='post'></textarea><br>
        <div align='right'><input type='submit' name='sreply' value='Reply'></div></td></tr></table></form>";
          }
    elseif (isset($brd)) {  
         $thread="SELECT * from f_thread where bname='$brd' order by timep DESC";
          $thread2=mysql_query($thread) or die ("Could not display threads");  
        print "<table class='table'><tr class='headline'><td colspan='5'><center>Forum</center></td></tr>
        <tr><td class='mainrowb'>Thread</td><td class='mainrowb'>Author</td><td class='mainrowb'>Last Poster</td><td class='mainrowb'>Replies</td><td class='mainrowb'>Views</td>";
        while ($thread3=mysql_fetch_array($thread2)) {
        print "<tr class='mainrow'><td><a href='forum.php?brd=$brd&msg=$thread3[ID]' title='$thread3[post]'>$thread3[title]</a></td>
        <td><a href='profile.php?id=$thread3[UID]'>$thread3[author]</center></td><td><a href='profile.php?id=$thread3[LUID]'>$thread3[lastpost]</a></td><td>$thread3[replies]</td>
        <td>$thread3[views]</td></tr>";
        }
        print "</table><br>
        <table class='otable'><tr class='headline'><td align='center'>New Thread</td></tr>
        <tr class='mainrow'><td><form name='thread' method='post'>Title: <input type='text' size='59' name='titlet'><br>
        <textarea cols='65' rows='9' name='postt'></textarea><br>
        <div align='right'><input type='submit' name='sthread' value='Post Thread'></div></td></tr></table></form>";
        } else {
    $forum="SELECT * from f_forum order by ID ASC";
    $forum2=mysql_query($forum) or die("Could not retrieve the users stats.");
    print "<table class='table'><tr class='headline'><td colspan='4'><center>Forum</center></td></tr>
    <tr><td class='mainrowb'>Board Name</td><td class='mainrowb'>Description</td></tr>";
    while ($forum3=mysql_fetch_array($forum2)) {
    print "<tr class='mainrow'><td><a href='forum.php?brd=$forum3[bname]'>$forum3[fname]</a></td><td>$forum3[desc]</td></tr>";
    }
    $last="SELECT * FROM f_post ORDER BY timep DESC limit 5";
    $last2=mysql_query($last) or die(mysql_error());
    print "</table>
    <br><table><tr><td><table class='left'><tr class='headline'><td colspan='2'>Last Replies</td></tr>
    <tr><td class='mainrowb'>Title</td><td class='mainrowb'>Author</td></tr>";
    while ($last3=mysql_fetch_array($last2)) {
    print "<tr class='mainrow'><td><a href='forum.php?brd=$last3[bname]&msg=$last3[msg]'>$last3[title]</a></td><td><a href='profile.php?id=$last3[UID]'>$last3[author]</a></td></tr>";
      }
    $lastt="SELECT * FROM f_thread ORDER BY ID DESC limit 5";
    $lastt2=mysql_query($lastt) or die(mysql_error());
    print "</td></tr></table><td><table class='right'><tr class='headline'><td colspan='2'>Last Threads</td></tr>
    <tr><td class='mainrowb'>Title</td><td class='mainrowb'>Author</td></tr>";
    while ($lastt3=mysql_fetch_array($lastt2)) {
    print "<tr class='mainrow'><td><a href='forum.php?brd=$lastt3[bname]&msg=$lastt3[ID]'>$lastt3[title]</a></td><td><a href='profile.php?id=$lastt3[UID]'>$lastt3[author]</a></td></tr>";
      }
    print "</tabe></td></tr></table>";
    }
  }
?>[/code]

Now I have a new php file created named image.php, this is what it contains.

[code]<?php
session_start();
if (isset($_GET['img'])) {
$img_name = "userimages/$pstats3[uimage]";
$max_width    = 150;
$max_height   = 150;
$size=getimagesize($img_name);
$width_ratio=($size[0] / $max_width);
$height_ratio =($size[1] / $max_height);

if($width_ratio>=$height_ratio)
{
   $ratio=$width_ratio;
}
else
{
   $ratio=$height_ratio;
}
$new_width=($size[0] / $ratio);
$new_height=($size[1] / $ratio);
header("Content-Type: image/jpeg");
$src_img = imagecreatefromjpeg($img_name);
$thumb = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($thumb, $src_img, 0,0,0,0,($new_width-1),($new_height-1),$size[0],$size[1]);
imagejpeg($thumb);
imagedestroy($src_img);
imagedestroy($thumb);
exit();
}
?>[/code]

[kenrbnsn]

The source looks ok. Look at the generated HTML to see if the <img> tag is being created correctly.

Ken

[SieRobin]

All I did was change what you put into what was needed for the img tag. Ehmn, but let me double check it.

What I don't get is how is image.php associated with forum.php when it really isn't being a link clicked for the $_GET situation?

[kenrbnsn]

[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]What I don't get is how is image.php associated with forum.php when it really isn't being a link clicked for the $_GET situation?[/quote]

This code in the <img> tag is what invokes the script.
[code]<img src='image.php?img=userimages/$stats3[uimage]' border='0'>[/code] with the get method.

Ken

[SieRobin]

Doesn't seem to be working though, or else I suppose it would be pulling the information from the file.

I don't have to do an include do I?

[kenrbnsn]

Did you do this:
[!--quoteo--][div class=\'quotetop\']QUOTE[/div][div class=\'quotemain\'][!--quotec--]Look at the generated HTML to see if the <img> tag is being created correctly.[/quote]

If the generated code references image.php with the correct parameters, you will have to add debug statements to image.php. These can't write the information to the screen, but will have to write to a files.

[a href=\"http://www.rutgerspromenaders.org/pictures/index.php?d=./dances/2006/0402\" target=\"_blank\"]This[/a] site that I wrote uses a similar mechanism. It's a picture gallery, but the concept is the same. If you do a "show source" and scroll down towards the end you will see the <img> tags.

Ken