Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

php Image Functions

Posted on 2007-11-27
2
Medium Priority
?
279 Views
Last Modified: 2013-12-25
See sample.

The first image is a jpeg. I need to know the php image function coding to produce the 2nd image (with the green background) from the first.
0
Comment
Question by:Richard Korts
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 5

Expert Comment

by:mms_master
ID: 20361913
I don't know how to do this if the image is a jpeg sorry.
I'm not sure if its even possible. The only ways I can think of doing it with jpegs is to either replace the white colour for another colour; which could result in problems if there are other white ares in the image that shouldnt be replaced. Or to try to create a shape in the white areas and fill the shape with a new colour. But that means it would only fill that shape, and if you use a different image it wont work...

However if you can use gif images instead of jpeg images I have a solution for you.
Change your first image to a gif with a transparent background instead of a white background.
Then use the following php code
(Note: the output file is a gif, but it can be changed to jpeg as long as the first image is a gif)
<?php
 
function EditImage($image, $red, $green, $blue, $newfile) {
 
	$height = imagesy($image);
	$width = imagesx($image);
 
    $img = imagecreatetruecolor($width, $height);
    $col = imagecolorallocate($img, $red, $green, $blue);
	imagefill($img, 0, 0, $col);
	imagecopymerge($img, $image, 0, 0, 0, 0, $width, $height, 100);
	imagegif($img, $newfile);
	
 
}
 
header("Content-type: image/gif");
$NewImage = EditImage(imagecreatefromgif("merged4.gif"), 3, 108, 101, "newimage.gif");
echo "<html><body>";
echo "<img src='newimage.gif'>";
echo "</body></html>";
?>

Open in new window

0
 
LVL 20

Accepted Solution

by:
steelseth12 earned 2000 total points
ID: 20366271
With white background it would be very very difficult to do.
Instead use the image i uploaded for you. Sort of like they use a green screen in the movies.

https://filedb.experts-exchange.com/incoming/ee-stuff/5859-merged4.jpg

and use the script below to change colors
<? header("Content-type:image/jpeg");
 
	$img = imagecreatefromjpeg("merged4.jpg"); // create image
	
	$width = imagesx($img); // get width
	
	$height = imagesy($img); // get height
	
	$color = imagecolorallocate($img,3,108,101); // allocate new color (rgb values)
	
	//$color = imagecolorallocate($img,255,120,0); //test with another color
	
	for($x=0;$x<$width;$x++) { //loop all x
	
		for($y=0;$y<$height;$y++) { //loop all y
		
			$set = imagecolorat($img,$x,$y); //get index for x,y
 
			$colors = imagecolorsforindex($img, $set); // get rgb
			
			if($colors["red"] < 15 && $colors["green"] > 240  && $colors["blue"] < 15	) { // check color 
			
				imagesetpixel($img,$x,$y,$color); //replace color
				
			}
		
		}
		
	}
 
	imagejpeg($img,null,100); //output image
	
?>

Open in new window

0

Featured Post

Simplify Your Workload with One Tool

How do you combat today’s intelligent hacker while managing multiple domains and platforms? By simplifying your workload with one tool. With Lunarpages hosting through Plesk Onyx, you can:

Automate SSL generation and installation with two clicks
Experience total server control

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Australian government abolished Visa 457 earlier this April and this article describes how this decision might affect Australian IT scene and IT experts.
CTAs encourage people to do something specific to show interest in your company, product or service. Keep reading to learn why CTAs should always be thought of as extremely important, albeit small, sections of websites.
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
Suggested Courses

618 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question