Changing color in GD via variable?

Posted on 16th Feb 2014 07:03 pm by admin

Hey guys, I'm new here. x)

I'm very much a noob when it comes to PHP, but I'm trying to learn as much as I can. I've been writing a script which will generate a new image after submitting some hex codes, using these hex codes to generate certain colored parts of the image. Everything works just dandy - when you first visit the page, the values in the boxes specify the original hex codes that identify the color that is being changed. So, when you put in a new value and submit it, the page refreshes and displays those new values. I store these values in variables, and so in the script that generates the image, call the hex codes that a) need to be changed and b) replace the old hex codes. Unfortunately, the only problem is that it isn't actually changing the colors.

So I'm not really sure how to use variables to obtain these old and new hex codes.

demo.php (this is the image generating script)
Code: [Select]<?

$line = imagecreatefrompng('/images/character/etw/etwmaleline.png');
$base = imagecreatefrompng('/images/character/etw/etwmalebase.png');
$base2 = imagecreatefrompng('/images/character/etw/etwmale2base.png');
$eyes = imagecreatefrompng('/images/character/etw/etwmaleeyes.png');
$statc = imagecreatefrompng('/images/character/etw/etwmalestatc.png');

//BASE hex

$width = imagesx($base);
$height = imagesy($base);

$colorToChange = $pbase;
$newbaseColor = $_GET['base'];

$c1 = sscanf($colorToChange,"%2x%2x%2x");
$c2 = sscanf($newbaseColor,"%2x%2x%2x");

$cnew = imagecolorallocate($base,$c2[0],$c2[1],$c2[2]);

for ($y=0;$y<$height;$y++) {
for ($x=0;$x<$width;$x++) {
$rgb = imagecolorat($base,$x,$y);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
if (($r==$c1[0]) && ($g==$c1[1]) && ($b==$c1[2])) {
imagesetpixel($base,$x,$y,$cnew);
}
}
}

//BASE2 hex

$width = imagesx($base2);
$height = imagesy($base2);

$colorToChange = $pbase2;
$newbase2Color = $_GET['base2'];

$c1 = sscanf($colorToChange,"%2x%2x%2x");
$c2 = sscanf($newbase2Color,"%2x%2x%2x");

$cnew = imagecolorallocate($base2,$c2[0],$c2[1],$c2[2]);

for ($y=0;$y<$height;$y++) {
for ($x=0;$x<$width;$x++) {
$rgb = imagecolorat($base2,$x,$y);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
if (($r==$c1[0]) && ($g==$c1[1]) && ($b==$c1[2])) {
imagesetpixel($base2,$x,$y,$cnew);
}
}
}

//EYES hex

$width = imagesx($eyes);
$height = imagesy($eyes);

$colorToChange = $peyes;
$neweyesColor = $_GET['eyes'];

$c1 = sscanf($colorToChange,"%2x%2x%2x");
$c2 = sscanf($neweyesColor,"%2x%2x%2x");

$cnew = imagecolorallocate($eyes,$c2[0],$c2[1],$c2[2]);

for ($y=0;$y<$height;$y++) {
for ($x=0;$x<$width;$x++) {
$rgb = imagecolorat($eyes,$x,$y);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
if (($r==$c1[0]) && ($g==$c1[1]) && ($b==$c1[2])) {
imagesetpixel($eyes,$x,$y,$cnew);
}
}
}

imagealphablending($line, 1);
imagealphablending($base, 1);
imagealphablending($base2, 1);
imagealphablending($eyes, 1);
imagealphablending($statc, 1);

$i= array($base, $eyes, $base2, $statc, $line);

$s = imagemergealpha($i);

//Merge multiple images and keep transparency

//$i is and array of the images to be merged:
// $i[1] will be overlayed over $i[0]
// $i[2] will be overlayed over that
// ...

//the function returns the resulting image ready for saving

function imagemergealpha($i) {

//create a new image
$s = imagecreatetruecolor(imagesx($i[0]),imagesy($i[1]));

//merge all images
imagealphablending($s,true);
$z = $i;
while($d = each($z)) {
imagecopy($s,$d[1],0,0,0,0,imagesx($d[1]),imagesy($d[1]));
}

//restore the transparency
imagealphablending($s,false);
$w = imagesx($s);
$h = imagesy($s);
for($x=0;$x<$w;$x++) {
for($y=0;$y<$h;$y++) {
$c = imagecolorat($s,$x,$y);
$c = imagecolorsforindex($s,$c);
$z = $i;
$t = 0;
while($d = each($z)) {
$ta = imagecolorat($d[1],$x,$y);
$ta = imagecolorsforindex($d[1],$ta);
$t += 127-$ta['alpha'];
}
$t = ($t > 127) ? 127 : $t;
$t = 127-$t;
$c = imagecolorallocatealpha($s,$c['red'],$c['green'],$c['blue'],$t);
imagesetpixel($s,$x,$y,$c);
}
}

imagesavealpha($s,true);
return $s;
}

header('Content-type: image/png');
imagepng($s);
imagedestroy($s);

error_reporting(E_ALL);

?>
hextest2.php
Code: [Select]<?php

include_once('test2.php');

$pbase = 'c8c8c8';
$pbase2 = 'c8c8c8';
$peyes = 'c8c8c8';

if (!isset($_GET['preview']) && !isset($_GET['submit']))
echo "thou hast naught yet submat thee hex codes!";

elseif (isset($_GET['preview']) && !isset($_GET['submit']))
include_once('test3.php');

else (
include_once('test4.php'));

?>

<html>
<head>
<title>Soundtrack Howl!</title>
<link rel="stylesheet" type="text/css" />
</head>
<body style="background-color: #d8d8d8;"> <center>

<table width="700px"> <tr> <td width="400px">

<img src="demo.php"/>

</td> </tr>
<tr> <td width="300px">

<form action="<?=$_SERVER['PHP_SELF']?>" method="get">
<b>Base:</b> # <input type="text" name="base" value="<? echo($pbase); ?>" /> <br />
<b>2nd Base:</b> # <input type="text" name="base2" value="<? echo($pbase2); ?>" /> <br />
<b>Eyes:</b> # <input type="text" name="eyes" value="<? echo($peyes); ?>" /> <br />
<input type="submit" name="preview" value="Preview Character!" /> <br /> <br />

<input type="submit" name="submit" value="Make Your New Character!!" />
</form>

</td> </tr> </table>

</center>
</body>
</html>
test3.php
Code: [Select]<?php

include_once('./includes/general.php');

if ($_GET['base']=='' or $_GET['base2']=='' or $_GET['eyes']==''){
echo "You haven't filled them all out! <br />";
}

if (strlen($_GET['base'])<'6' || strlen($_GET['base2'])<'6' || strlen($_GET['eyes'])<'6'){
echo "The hex codes are incomplete! <br />";
}

else {

$pbase = $_GET['base'];
$pbase2 = $_GET['base2'];
$peyes = $_GET['eyes'];
}

?>
test4.php
Code: [Select]<?php

include_once('./includes/general.php');

if ($_GET['base']=='' or $_GET['base2']=='' or $_GET['eyes']==''){
echo "You haven't filled them all out!";
}

else {

$nbase = $_GET['base'];
$nbase2 = $_GET['base2'];
$neyes = $_GET['eyes'];

$sql = mysql_query("INSERT INTO `character` (`base`, `base2`, `eyes`)
VALUES ('$nbase', '$nbase2', '$neyes') ") or die("Thou has submat thee hex codes! There be errors abreast!<br />".mysql_error());

header('Location: complete.php');

}

?>
And /includes/general.php is just the file that connects to the database.

I'm SO sorry, I know it's a ton of stuff to read, but I want to make sure the problem isn't just in demo.php. Also, I'm aware that my script(s) are messy and may have some unnecessary coding, so just ignore that unless it has anything to do with my problem XD To clarify, I did not actually literally write the image generating script all by myself. I used php.net and googled some stuff to reference.

Thanks

Your Answer:

Login to answer

Other forums

Accept only alpha characters
I've got this bit of code ready for accepting a phrase:

Code: if (!eregi ("", $_POS

writing a screen scraper
Hello,

I'm writing a screen scraper application and want to be able to get absolute addresses

New to mysqli library - Multiple query problem
Greetings,

I am writing a batch program that executes 3 queries on a single page. Using mysql

Question handling xml data
Hello,

I have sucessfull followed this tutorial
http://www.phpfreaks.com/tutorial/handlin

Material xxx does not exist in plant xxx
Dear All,

I am working for a steel project which is repetitive manufacturing.

insert quotes
Hi,

I have an output like this:
Code: john,18,Cancer
How can I change this to
Code:

Multiple while loops
I have several DB queries that I know should be returning results and aren't. I have a feeling it ha

How to generate a random array of integers subject to a certain constraint
I am writing a program that asks the user to enter an integer N and then generates a random array of

Scene graph using Direct3D?
There are several C++ scene graph based packages available for OpenGl, like say OSG,

http://w

Confusing Functions
So, I've been reading up on Functions and I like them! However, I need some help using variables in