CAPTCHA Image sizing problem

[Goose87]

Hi Guys,

 

I have the following CAPTCHA image creation.  I am not familiar with the style of coding used here, and I need to make the image twice the size.  If anyone could possible edit it for me, and explain what they've done, I'd be extremely grateful.

 

Many Thanks in advance.

Goose.

 

<?php 
/* image_grid.php
Click Captcha Ver 1.2
Created on: 10/27/2007 by Ron Hickey
Idea by http://www.6tx.net/forum  member pappy 
http://6tx.net/sc2 */
//buffer
ob_start('ob_gzhandler');
session_start();
//DEC 67 
//get a, decode and round
// 
$a = $_GET['a'];
if ($a == $_SESSION['afloat']){
$aa = round(base64_decode($a)) - 1; 
$im = imagecreatetruecolor (54, 69);
//DEC 79 
//random numbers
// 
$myn = array(1, 2, 3, 4, 5, 6, 7, 8, 9);
$rn = array_rand($myn, 9);
$string1 = "" . $myn[$rn[0]] . " " . $myn[$rn[1]] . " " . $myn[$rn[2]] . "";
$string2 = "" . $myn[$rn[3]] . " " . $myn[$rn[4]] . " " . $myn[$rn[5]] . "";
$string3 = "" . $myn[$rn[6]] . " " . $myn[$rn[7]] . " " . $myn[$rn[8]] . "";	
$mynum = "" . $string1 . " " . $string2 . " " . $string3 . "";
//DEC 68 DEC 69 DEC 66  DEC 89  DEC 82
//string, random click number and line coord
$na = 17;
$nb = 54;
$nc = 0; 
$nd = 54;
$ab = explode(" ", $mynum);
$mystring = "Click $ab[$aa]";
//random image color
//
$change = rand(1,9);
$lime = imagecolorallocate($im,0,255,0);
$yellow = imagecolorallocate($im,255,255,0);
$white = imagecolorallocate($im,255,255,255);
$lgray = imagecolorallocate($im,206,206,206); 
$gray = imagecolorallocate($im,115,115,115); 
$black = imagecolorallocate($im,0,0,0);
$green = imagecolorallocate($im,1,107,0);
$grc = " $lime $yellow $white $lgray $yellow $white $gray $black $green";
$rc = explode(" ", $grc);
$bgc = $rc[$change]; 
//DEC 72 
//line & number colors
//
$bc = imagecolorallocate ($im, 0, 0, 0); 
$rd = imagecolorallocate ($im, 255, 0, 0); 
$wh = imagecolorallocate ($im, 255, 255, 255);
//DEC 73 
//if color = this change line & number color 
//
if (($change > 3) && ($change < 7)) { $bc = $rd;} 
elseif ($change > 6) { $bc = $wh;}
//DEC 67 
//fill image color
// 
imagefilledrectangle ($im, 1, 1, 54, 69, $bgc);
imagerectangle ($im, 0, 0, 53, 68, $bc); 
//DEC 75 
//vertical lines 
//
for($i=$na;$i<=$nb;$i+=19)
imageline($im,$i,17,$i,69,$bc);
// Horizontal Lines
for($i=$na;$i<=$nb;$i+=17)
imageline($im,0,$i,54,$i,$bc);
//DEC 69 
//image string
// 	
imagestring ( $im, 9, 5, 18,$string1, $bc);
imagestring ( $im, 9, 5, 35,$string2, $bc);
imagestring ( $im, 9, 5, 52,$string3, $bc);  
imagestring ($im, 3, 2, 3, "$mystring", $bc); 
//DEC 89 
//header content 
//
header("Content-Type: image/gif"); 
//DEC 48 
//send image
//
imagegif($im); 
//DEC 55 
//destroy image 
//
imagedestroy($im); 
}
//flush
ob_end_flush();
?>

[Brandon Jaeger]

I'll take a stab at it.

 

All I did was multiply the values by 2:

<?php 
/* image_grid.php
Click Captcha Ver 1.2
Created on: 10/27/2007 by Ron Hickey
Idea by http://www.6tx.net/forum  member pappy 
http://6tx.net/sc2 */
//buffer
ob_start('ob_gzhandler');
session_start();
//DEC 67 
//get a, decode and round
// 
$a = $_GET['a'];
if ($a == $_SESSION['afloat']){
$aa = round(base64_decode($a)) - 1; 
$im = imagecreatetruecolor (54*2, 69*2);
//DEC 79 
//random numbers
// 
$myn = array(1, 2, 3, 4, 5, 6, 7, 8, 9);
$rn = array_rand($myn, 9);
$string1 = "" . $myn[$rn[0]] . " " . $myn[$rn[1]] . " " . $myn[$rn[2]] . "";
$string2 = "" . $myn[$rn[3]] . " " . $myn[$rn[4]] . " " . $myn[$rn[5]] . "";
$string3 = "" . $myn[$rn[6]] . " " . $myn[$rn[7]] . " " . $myn[$rn[8]] . "";   
$mynum = "" . $string1 . " " . $string2 . " " . $string3 . "";
//DEC 68 DEC 69 DEC 66  DEC 89  DEC 82
//string, random click number and line coord
$na = 17;
$nb = 54;
$nc = 0; 
$nd = 54;
$ab = explode(" ", $mynum);
$mystring = "Click $ab[$aa]";
//random image color
//
$change = rand(1,9);
$lime = imagecolorallocate($im,0,255,0);
$yellow = imagecolorallocate($im,255,255,0);
$white = imagecolorallocate($im,255,255,255);
$lgray = imagecolorallocate($im,206,206,206); 
$gray = imagecolorallocate($im,115,115,115); 
$black = imagecolorallocate($im,0,0,0);
$green = imagecolorallocate($im,1,107,0);
$grc = " $lime $yellow $white $lgray $yellow $white $gray $black $green";
$rc = explode(" ", $grc);
$bgc = $rc[$change]; 
//DEC 72 
//line & number colors
//
$bc = imagecolorallocate ($im, 0, 0, 0); 
$rd = imagecolorallocate ($im, 255, 0, 0); 
$wh = imagecolorallocate ($im, 255, 255, 255);
//DEC 73 
//if color = this change line & number color 
//
if (($change > 3) && ($change < 7)) { $bc = $rd;} 
elseif ($change > 6) { $bc = $wh;}
//DEC 67 
//fill image color
// 
imagefilledrectangle ($im, 1, 1, 54*2, 69*2, $bgc);
imagerectangle ($im, 0, 0, 53*2, 68*2, $bc); 
//DEC 75 
//vertical lines 
//
for($i=$na;$i<=$nb;$i+=19)
imageline($im,$i*2,17*2,$i*2,69*2,$bc);
// Horizontal Lines
for($i=$na;$i<=$nb;$i+=17)
imageline($im,0,$i*2,54*2,$i*2,$bc);
//DEC 69 
//image string
//    
imagestring ( $im, 9, 5*2, 18*2,$string1, $bc);
imagestring ( $im, 9, 5*2, 35*2,$string2, $bc);
imagestring ( $im, 9, 5*2, 52*2,$string3, $bc);  
imagestring ($im, 3, 2*2, 3*2, "$mystring", $bc); 
//DEC 89 
//header content 
//
header("Content-Type: image/gif"); 
//DEC 48 
//send image
//
imagegif($im); 
//DEC 55 
//destroy image 
//
imagedestroy($im); 
}
//flush
ob_end_flush();
?>

[Brandon Jaeger]

In the second parameter of the imagestring functions, you have 9 as the font size, whereas it can only go up to 5. I'm not sure how to make it any bigger, so its going to look a bit off in the generated image. The only way I can think of is if you use imagettftext, but then you're going to have to load your own font file.

[Goose87]

Thanks Brandon,

 

you have the right idea, the box is larger (with the lines) but the original shape and size is still the same, so it only displays the first 3 characters because it's trying to draw a large box inside an area that was the size of the original one.  I think you missed some of the numbers.  I'm fiddling now to try and get it to work.  I don't really understand the image drawing stuff though

 

anyone else have any idea?

[Goose87]

I found another bit of text which edited the size of the box on the script that calls up this one.  I MAY have fixed it.  I'm fiddling now..I'll post another messgae if it works in a min

[Goose87]

At the moment I have it appearing like this:

 

 

 

I have managed to make the actual rectangle larger, but the font doesn't line up within the squares.  Any ideas? I have fruitlessly fiddled