I am trying to merge two images - a GIF image with a smaller JPG image. The output should be GIF.
The issue is that GIF image colors remain correct, but the colors of the JPG image are altered.
The GIF image has only 256 colors (8-bit), but is there a way to make the merged image to be a true-color resource which later can be converted to a 8-bit GIF for output?
Issue solved.
I updated the code. Here is the solution which works fine:
<?php
header('Content-Type: image/gif');
$gif_address = 'file.gif';
$jpg_address = 'file.jpg';
$image1 = imagecreatefromgif($gif_address);
$image2 = imagecreatefromjpeg($jpg_address);
$merged_image = imagecreatetruecolor(800, 800);
imagecopymerge($merged_image, $image1, 0, 0, 0, 0, 800, 800, 100);
imagecopymerge($merged_image, $image2, 0, 0, 0, 0, 500, 500, 100);
imagegif($merged_image);
imagedestroy($image1);
imagedestroy($image2);
imagedestroy($merged_image);
?>
From your explanation (some code would help), i would hazard a guess you are merging the jpeg onto the gif. Id say the easiest way is to use imageCreateTrueColor to create a new image the size you need then use imagecopy to copy the GIF into this new image. Merge the jpg onto this and then at a later date you can covert the true colour image to a gif.
If im missing something a bit of example code of what you are currently doing might help.
Related
We're using a CMS with WideImage built in and no scope to change this, however we've come up against a situation where we need to produce 300x300 images.
However the images that are uploaded at approx 100x100 in jpg and png format with various levels of transparency.
I'm trying to create a 300x300 canvas, and place the 100x100 image inside of it - however I want both the canvas to remain transparent, and the image placed on top to keep its transparency.
I've got
$image = WideImage::loadFromFile( $this->local_path );
$canvas = WideImage::createTrueColorImage(300, 300);
$canvas_bg = $canvas->allocateColor(255, 255, 255);
$canvas->fill(0, 0, $canvas_bg);
$resized_image = $canvas->merge($image);
However this obviously just adds a white background to the canvas, I cant figure out from their documentation how to make it transparent.
Thanks
How about:
$image = WideImage::loadFromFile($this->local_path);
$resized_image = $image->resizeCanvas(300, 300, 0, 0);
You can specify the X and Y location of the image within the new canvas as well as its width and height. $image->resizeCanvas(300, 300, "center", "center") works quite well.
I am trying to create an employee poster for a website that I develop. My goal is to take an image from a directory on the server of any file type (.png, .gif, .jpeg, etc.) and copy it onto another generate imaged that will then be outputted to the browser.
The problem is that I use:
$final_image = imagecreatefrompng("large_background.png");
for making the final image and for some reason if I add profile images with the type jpeg's, gif's, etc, (any type that isn't a jpeg) it doesn't work. The images never show up in the output. However, if I use png's it does work.
To solve this problem I tried converting the image to a png and then creating a png from it as shown in the code below. Unfortunately it doesn't work. Profile images still do not show up on the background.
// get image from database
$image_from_database = could be a .png, .jpeg, .gif, etc.
// get the image from the profile images directory
$path = "profile_images/".$image_from_database;
// create a png out of the image
$image = imagecreatefrompng(imagepng($path));
// add the $image to my larger $final_image (which is a png)
imagecopy($final_image, $image, $x, $y, 0,0, $height, $width);
imagepng($final_image, $ouput_url);
...
Can anybody tell me why this won't work? My profile images do not show up in the output of the final image.
My questions,
Is this line imagecreatefrompng(imagepng(...)); even possible? Essentially I want to convert an image of any type into a png and then create a png from it.
I'm just running a few local tests... The following works:
$src = imagecreatefromgif('test.gif');
$dest = imagecreatefrompng('test.png');
imagecopy($dest, $src, 0, 0, 0, 0, 100, 100);
header('Content-Type: image/png');
imagepng($dest);
imagedestroy($src);
imagedestroy($dest);
So does this:
$src = imagecreatefromstring(file_get_contents('test.gif'));
If you're still having trouble after trying the latter example, please update your question. The actual images you're using would be helpful, in addition to a functional code example.
After you read an image with a imagecreatefrom* function, it doesn't matter what format the original was.
imagecreatefrom* functions return an image resource. When the image is loaded you are using internal representation of the images and not PNG, JPEG or GIF images.
If the images are successfully loaded imagecopy should have no problems with them.
This code uses images in different formats and works without a problem:
$img = imagecreatefrompng('bg.png');
$png_img = imagecreatefrompng('img.png');
$jpeg_img = imagecreatefromjpeg('img.jpeg');
$gif_img = imagecreatefromgif('img.gif');
/* or use this, so you don't need to figure out which imagecreatefrom* function to use
$img = imagecreatefromstring(file_get_contents('bg.png'));
$png_img = imagecreatefromstring(file_get_contents('img.png'));
$jpeg_img = imagecreatefromstring(file_get_contents('img.jpeg'));
$gif_img = imagecreatefromstring(file_get_contents('img.gif'));
*/
imagecopyresampled($img, $png_img, 10, 10, 0,0, 100, 100, 200, 200);
imagecopyresampled($img, $jpeg_img, 120, 10, 0,0, 100, 100, 200, 200);
imagecopyresampled($img, $gif_img, 230, 10, 0,0, 100, 100, 200, 200);
header('Content-Type: image/png');
imagepng($img);
Your example
$image = imagecreatefrompng(imagepng($path));
is wrong.
imagepng is used to output an image resource as a PNG image. If you provide a path as a second argument a PNG image file is created, otherwise it's printed to the output like echo does.
What imagepng actually returns is a boolean, indicating, if the output was successful.
You are then passing that boolean to imagecreatefrompng which expects a filepath. This is obviously wrong.
I suspect you have a problem with loading images.
imagecreatefrom* functions return FALSE on failure and you should check, if you have any problems with that.
Maybe your image paths are relative to doc root and your working directory is different.
Or you have permission problem.
Or your images are just missing.
It's impossible to tell from your question.
I made a small function to upload images then show them on my website.
My question is now, can I change the file size of a image, on same time as I upload it?
Take facebook as example. Even large images has a size on like 65kb.
If so, witch function should I use?
Thanks,
use the imagecopyresampled function:
$source_image = imagecreatefromjpeg("youtimagejpg");
$src_w= imagesx($source_image);
$src_h= imagesy($source_image);
$dest_image = imagecreatetruecolor(100, 100); //targeted width and height
imagecopyresampled($dest_image, $source_image, 0, 0, 0, 0, 100, 100, $source_w, $source_h);
imagejpeg($dest_image,NULL,80);
//Replace null by the path if you want to save on the server, otherwise the image will be sent to the client intead.
If you want to reduce the size of the image without resizing it; use the imagejpeg function (with a low quality factor)
There are next ways to change image size:
Convert to another image format.
Save image with lossy compression (http://en.wikipedia.org/wiki/Lossy_compression)
Resample image with another width & height (http://php.net/manual/en/function.imagecopyresampled.php)
I have a script that creates an image whose height depends on the depth of a recursive tree. Precalculating the height of the image would be a pain, because I would need to run a recursive function twice. Thus, I wonder if it is possible to resize the image from inside my only recursive function. Long story short, I need to resize an image resource, is it possible? For instance, how can I make the following code work? Thanks!
//Create the image
$image = imagecreatetruecolor(800, 100);
//Change the image height from 100 to 1000 pixels
imagecopyresized($image, $image, 0, 0, 0, 0, 800, 1000, 800, 100);
//Set the header
header('Content-Type: image/png');
//Output the image
imagepng($image);
//Destroy the image
imagedestroy($image);
Your code is almost perfect, except you aren't giving it the source image to work with. You need $source = imagecreatefrompng("someimage.png");, and then in your imagecopyresize set the source image argument to $source.
What seems to be simple, isn't :(
I'm trying to add something like a watermark (transparent png) on an image (jpg).
This is the code I'm using:
$width = 800;
$height = 600;
$bottom_image = imagecreatefromjpeg("portrait1.jpg");
$top_image = imagecreatefrompng("man2.png");
imagesavealpha($top_image, true);
imagealphablending($top_image, true);
imagecopy($bottom_image, $top_image, 200, 200, 0, 0, $width, $height);
header('Content-type: image/png');
imagepng($bottom_image);
When I merge the images, the png is positioned at the right place, everythig above and left of it is good (jpg is copied), but everything else is black.
I've tried setting imagesavealpha and imagealphablending to false, there wasn't any difference.
You can see the resulting image at http://ekstrakt.selfip.com/photobomb/image.php
I've searched around the net, I can't find a solution.
Any help is appreciated.
Your $width and $height should be the dimensions of the watermark, not of the photo. What you're telling it to do is copy the watermark with a much bigger size than it is. When it reads part of an image that doesn't exist (coordinates out of bounds) the result is opaque black, giving the result you see.
Use imagecopymerge() instead of imagecopy()
U may also like imagesavealpha()