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

mail with attachment problems
Hi. I have the following code:
Code: else if(file_exists("site".$timp.".zip")

output printing as hexadecmal... XD
Everything works except the calcem call for the totusold and totuprice. The out put shows up as hex.

Convert array to string and write to csv file
I am looking to write a MySQL query to a csv file.

At the minute I:

check for the orig

Comma seperated implode & modifying returned string.
I have a PHP post form that posts up to 4 variables. I need whatever variables are passed to be comb

Beginners syntax and loop questions - help please!
Hi everyone,

I have some problems with php code. I'm currently in the middle of learning php,

Stopping page post back
I have few literal contriols in my page and a repeater too. But inspite of using update panel, postb

include function being weird?
I have a very simple system to grab an IP outputted by a PHP file.. (for a project I have) but it ou

Matchcode in ALV change header column
Hello everyone,

I am working in an SAP system that is currently in upgrade and conversion

$_FILES array
Ok,

I just started experimenting with PHP today. My goal right now is to have people be able

Unexpected T_Variable ?
Hi all,
I dont really know what I am doing!! I know I'm doing something wrong, and I know its on