How can I merge 3 images into 1 image via PHP?
Solution 1
there are so many comments on this answer so I'm posting this as an answer.
Got it working on my pc.
use svens code :
$images = array( $_GET['color'], $_GET['face'], $_GET['hat'] );
// Allocate new image
$img = imagecreatetruecolor(58, 75);
// Make alpha channels work
imagealphablending($img, true);
imagesavealpha($img, true);
foreach($images as $fn) {
// Load image
$cur = imagecreatefrompng($fn);
imagealphablending($cur, true);
imagesavealpha($cur, true);
// Copy over image
imagecopy($img, $cur, 0, 0, 0, 0, 58, 75);
// Free memory
imagedestroy($cur);
}
header('Content-Type: image/png'); // Comment out this line to see PHP errors
imagepng($img);
?>
I renamed your images like this so its easier :
smile : a.png
headset : b.png
blue : c.png
Turns out the problem is with the layering it. Putting one behind the other
after you rename the images, use this url -- it will work(works on my pc).
YOUR_FILE.php?hat=b.png&color=c.png&face=a.png
This will still give you a black background. I am not sure if you have the exact same code as above in your file on the server - because I played around with the image order on your link and it does not help. Try copy-pasting this exact same code on a different file and then trying. Play around with the order and check the results.
Solution 2
Here's some code to get you started. However you should note that image processing with gd and alpha channels is voodoo.
<?php
$images = array( $_GET['color'], $_GET['face'], $_GET['hat'] );
// Allocate new image
$img = imagecreatetruecolor(58, 75);
// Make alpha channels work
imagealphablending($img, true);
imagesavealpha($img, true);
foreach($images as $fn) {
// Load image
$cur = imagecreatefrompng($fn);
imagealphablending($cur, true);
imagesavealpha($cur, true);
// Copy over image
imagecopy($img, $cur, 0, 0, 0, 0, 58, 75);
// Free memory
imagedestroy($cur);
}
header('Content-Type: image/png'); // Comment out this line to see PHP errors
imagepng($img);
?>
What you still have to do now is checking the return values (look up the image*
functions in the manual) to make sure it doesn't fail silently.
I can't really promise it's going to work with the alpha channels.. If not you'll probably have to go through the comments to the imagecopymerge()
or imagecopy()
on php.net and see if I missed something.
Comments
-
Seth almost 2 years
I really cannot find a way to successfully do it.. I've searched google for this and it either has black shades around the images or all the images don't overlap. Could you please help?
I am alright at PHP; I'd give myself a 2/5.. I would really appreciate if someone would be willing to help me out.
I'm looking for a simple api that goes something like:
$color=$_GET['color']; $face=$_GET['face']; $hat=$_GET['hat']; echo '<img src="avatar.php?color=$color&face=$face&hat=$hat">';
Thanks for any help in advance. I can understand php from my knowledge of other languages, too, so don't be afraid to talk technical with me; but not too technical.
-
Seth over 13 yearsYea, thanks, but it shows a corrupt image. :/ I'll go google some more.
-
svens over 13 yearsComment out the header and you'll probably know more. Lol wait, there's an error I should've spotted. Fixed now.
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Seth over 13 yearsOkay, I commented out that one line, got quite a few parse errors.. debugging time.
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Seth over 13 yearsWarning: imagecopymerge(): supplied argument is not a valid Image resource in /home/vol7/xtreemhost.com/xth_6884492/htdocs/avatar.php on line 18 Warning: imagepng(): supplied argument is not a valid Image resource in /home/vol7/xtreemhost.com/xth_6884492/htdocs/avatar.php on line 25
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Seth over 13 yearsOkay, now it works. However, it shows a black background, and I'm not sure that 'color' is displaying.
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Seth over 13 yearsSee it for yourself: gyropanda.co.cc/…
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svens over 13 yearsJust try out some things.. Like setting alphablending to true and maybe add a white background to the image. Short googling says you could use
imagecopy
if you enable alphablending (just replace the call to copymerge and drop the latest parameter). -
DMin over 13 years@Seth -- you should consider up-voting an answer (& possibly marking it as correct answer) from a person that has put in so much effort.
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Seth over 13 yearsThanks for the help, but the images appear corrupt.. do you think you know whats wrong?
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Seth over 13 yearsOh my god.. it just randomly started working.. well, it still has a black background. :/