Thx guys alooooooooot for this finally something usefull about GD ;)

But does anyone have any idea how to gain more quality on watermarks? What files to use?

I have codes that are doing watermarks but result is so bad! Colors are really totaly disorted & fzzy.

Anyone have any clue..?

Thx & all the best guys :P

Thanks a lot for this excellent script!

brother, thanks soooo much! u are so kind

Hey there!

First of all, amazing and helpful function. :) Thanks so much for putting it out there for the world to use.

Second, I have a slight problem. A customer with a web 2.0ish site has had all of their user-uploaded content saved into an SQL DB. This includes images.

As I am simply useless when it comes to these image mod in PHP stuff, do you have any suggestions as to how to move those images into the filesystem? I have the content type and the images themselves saved as a blob in the DB.

I was hoping, perhaps naively, to use your smart_image_resize function; but I guess this is a no-go!

Anyways, thanks so much for the function and even more if you can provide a tip for me. :)

Thanks for the post, the code is really useful. PHP GD functions are not very well documented in PHP, the sample code gives me a much better understanding as to how the GD functions work.

here's a crop n scale function i think works really nicely
could easily integrate into here

<?php
function crop_n_scale($src_img, $dimx, $dimy)
{
	// functional scaling
	$srcH = imagesy($src_img);
	$srcW = imagesx($src_img);
	$ratio = $dimy/$srcH;
	$new_W = $srcW*$ratio;
 
	if ($new_W<$dimx)
		$ratio = $dimx/$srcW;
 
	//$img = scale_image($src_img, $srcW*$ratio, $srcH*$ratio);
	$img=imagecreatetruecolor($srcW*$ratio,$srcH*$ratio);
	imagecopyresampled($img,$src_img,0,0,0,0,$srcW*$ratio,$srcH*$ratio,$srcW,$srcH);
 
	// crop (if necessary)
	$img = crop_image($img, $dimx, $dimy);
	return $img;
}
?>

Thank you. This code is very usefull.

I obtained better results in transparent quality for gifs with this modification. If this param isn't added, transparent parts are dirty, with undesired pixels.

Observe "$trnprt_color['blue']" added as param at the end.

...
// Allocate the same color in the new image resource
$trnprt_indx = imagecolorallocate($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue'], $trnprt_color['alpha']);
...

This alternative line also works
$trnprt_indx = imagecolorallocatealpha($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);

thank you! :D this was helpful! :D i just used it for something I'm writing for a friend :D

thanks again! :)

[...] ネットで調べたらsmart_image_resize関数ってやつを見つけました。 [...]

I thought I'd post my code from the comment below... any input would be appreciated.

//function to save the image to the server
function saveAdjustedImage($width, $height, $new_width, $new_height, $mime, $file)
{
	//create the image
	$adjusted_image = imagecreatetruecolor($new_width, $new_height);
 
	//resize jpg
	if(($mime == "image/jpg") || ($mime == "image/jpeg"))
	{	
		//get the image from the server
		$source = imagecreatefromjpeg($file);
 
		//resize the new image
		imagecopyresized($adjusted_image, $source, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
 
		//save the image
		imagejpeg($adjusted_image, $file);
	}
 
	//resize the gif
	elseif(($mime =="image/gif") || ($mime == "image/png"))
	{
		if($mime =="image/gif")
		{
			//get the image from the server
			$source = imagecreatefromgif($file);
		}
		else
		{
			//get the image from the server
			$source = imagecreatefrompng($file);
		}
 
		//chack for transparency
		$trnprt_indx = imagecolortransparent($source);
 
		//if the image is transparent, keep it's transparency		
		if ($trnprt_indx >= 0) 
		{
			// Get the original image's transparent color's RGB values
			$trnprt_color = imagecolorsforindex($source, $trnprt_indx);
 
			// Allocate the same color in the new image resource
			$trnprt_indx = imagecolorallocate($adjusted_image, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
 
			// Completely fill the background of the new image with allocated color.
			imagefill($adjusted_image, 0, 0, $trnprt_indx);
 
			// Set the background color for new image to transparent
			imagecolortransparent($adjusted_image, $trnprt_indx);
		}
 
		// Always make a transparent background color for PNGs that don't have one allocated already
		if($mime == "image/png")
		{
			// Turn off transparency blending (temporarily)
			imagealphablending($adjusted_image, false);
 
			// Create a new transparent color for image
			$color = imagecolorallocatealpha($adjusted_image, 0, 0, 0, 127);
 
			// Completely fill the background of the new image with allocated color.
			imagefill($adjusted_image, 0, 0, $color);
 
			// Restore transparency blending
			imagesavealpha($adjusted_image, true);
		}
 
		//adjust image and save to the server
		imagecopyresampled($adjusted_image, $source, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
 
		if($mime =="image/gif")
		{
			imagegif($adjusted_image, $file);
		}
		else
		{
			imagepng($adjusted_image, $file);
		}
 
	}//end else if
	else
	{
		echo "There was an problem with your file. Please try again.";
		exit();
	}
}//end function

Hi,

I thought that this script was working well, but I'm recieving an error on some transparent gifs:

Warning: imagecolorsforindex() [function.imagecolorsforindex]: Color index 63
out of range in /home/amarien/public_html/rocket/uploadprocessor.php on line 396

The image still uploads and looks fine. Why the error?

Any ideas about imagecolorsforindex()?

Thanks!

Hey, great function.. I had four or five of these types of scripts I was using independently for different purposes and your function seems to bring all the elements together.

Wanted to add something to it in return.
How about a watermark option?

Just added the $apply_watermark argument to smart_resize():

function smart_resize_image( $file, $width = 325, $height = 0, $proportional = true, $output = 'browser', $delete_original = false, $use_linux_commands = false, $apply_watermark = true )

Then added this if/else construct to replace the imagecopyresampled() function with code that combines the re-sized image with a watermark gif, (could be a png I suppose), if $apply_watermark is true.. Otherwise it functions like normal.

if ($apply_watermark) {
 
	$outputWidth = floor($rawWidth * $imageScaleTo);
	$outputHeight = floor($rawHeight * $imageScaleTo);
 
	$outputImage = Imagecreatetruecolor($final_width, $final_height);
	imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $final_width, $final_height, $width_old, $height_old);
 
	// Turn on alpha blending
	imagealphablending($outputImage, true);
 
	// Create overlay image - Could be a png?
	$watermark = imagecreatefromgif("../images/watermark.gif");
 
	// Get the offset centering for the overlay
	$offsetWidth = floor(($final_width - imagesx($watermark))/2);
	$offsetHeight = floor(($final_height - imagesy($watermark))/2);
 
	// Overlay watermark
	imagecopy($image_resized, $watermark, $offsetWidth, $offsetHeight, 0, 0, imagesx($watermark), imagesy($watermark));
 
 
	} else {
 
		imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $final_width, $final_height, $width_old, $height_old);
	}

Hope this is useful to somebody.

Question though.. Is it possible to use imagecopyresampled() instead of imagecopy()? I just couldn't get it to work somehow.. I Dunno, it's like quarter to four in the morning and I'm getting bleary eyed.. :-)

Anyway..

Once again, thanks for posting this excellent function!

-TIM

[...] while ago I wrote a php function for image resizing with preservation of transparency. It seems to have been quite popular, but until now there was no good way to fork the code, and/or [...]

Thank you for the part of the transparant crap!! Thankful to you forever ;)

To answer my own question about running out of memory...

Put this in the PHP script that calls smart_resize_image(...):

ini_set('memory_limit', '50M');

For more details about memory usage of the imagecreatefromjpeg function, see http://uk2.php.net/imagecreatefromjpeg

Thanks for this script, it is great but I wanted to ask if anyone has run into problems when processing large images?

I have a image that is 2.9MB large and the smart_resize_image function gives a PHP error because more memory is needed than the limit I have set in my php.ini file (32M). Does anyone know why so much memory is needed (i.e. over 32MB for a 2.9MB file) and if there is a workaround other than increasing memory_limit in php.ini?

Specific details:

• Problematic line:
  • $image = imagecreatefromjpeg($file);
• php.ini:
  • memory_limit = 32M
• Error Msg:
  • Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 13056 bytes) in /blah/library/imageProcessing.php on line 41).

We have implemented a modified version of your code to our core web service! Works great on BuildaSearch.com!
Cheers!

Why not just make the new image transparent before using imagecopyresampled?

$im = ImageCreateFromPNG($source);
$new_im = imagecreatetruecolor($new_size[0],$new_size[1]);
imagecolortransparent($new_im, imagecolorallocate($new_im, 0, 0, 0));
imagecopyresampled($new_im,$im,0,0,0,0,$new_size[0],$new_size[1],$size[0],$size[1]);

Don't know why it's missing, but here's a simple solution for rotating the image:

if ($rotate > 0) {
$image_resized = imagerotate($image_resized, $rotate, 0);
}

You just add $rotate = 0 in the arguments.

I was just wondering how you set the file you want, how you would call this function and display the image in a browser?

To change the quality for JPEG simply modify the following lines.

function smart_resize_image( $file, $width = 0, $height = 0, $proportional = false, $output = 'file', $delete_original = true, $use_linux_commands = false )
function smart_resize_image( $file, $quality, $width = 0, $height = 0, $proportional = false, $output = 'file', $delete_original = true, $use_linux_commands = false )

And then:

imagejpeg($image_resized, $output);
imagejpeg($image_resized, $output, $quality);

Just thought I would share this in case anyone else was running into bad quality images (default 75) produced by this script.

Thanks,
David

I couldn't get transparency working in GIFs unless I used imagecreate() instead of imagecreatetruecolor(). I guess GIF is palette-based, so the color indexes get messed up. php.net actually says "This function will not work with GIF file formats," although I think they're lying since it just doesn't play nice with transparency.

How do I use this script to output an image to the browser? Is there any example code?

Is there a way to make the crop area to stand more 'up' than the current position (vertically) considerring that
i have pictures which containt valued information mainly on the uppper part of the image.
Last, but not least is to say that the function is great! Works excellent with no black lines, no matter what the source and destination is !

Hi Max;

you have nice script . i'm new to php and im trying to get a script that risizes tranparent gif and display the image in the screen. I spentlot of time playingwith your wornderfull script , but could not worked it. any help and scipt example would be appreciated

thanks
jeff

This is very nice function

very very useful for me

Thanks a lot.

Hi,

thanks for the great solution to preserving transparency. On Debian Etch I found that the transparency is not coming out correctly, and instead a grey background shows up (try for example this image: http://www.nba.com/media/bos_50px_080328.gif

Any others experiencing the same thing?

So...how would I use this function to output a resized image to the browser?

FANTASTIC :)

Thanks, this is just what i was looking for, really made life easier for me!

Cheers!
R

P.S Please do something about your captcha... its one of the most irritating that i have ever come accross.

I used this great script for a small Web project and it works fine on my local computer in an (OSX 10.4) PHP 4 environment. Recently I upgraded to OSX 10.5 that works with PHP5 and now I get this fatal error: 'call to undefined funtion imagecreatefromjpeg()' it's probably just a tiny thing but anyone here with the same problem and a suggestion how to fix it? thx a lot!

Thank you for writing this. It is exactly what I have been looking for all day, but there is one problem. GIF's and 8 bit PNG's do not show transparency correctly. GIF's just come out with white wherever it is supposed to be transparent and then 8 bit PNG's end up distorted-looking with random pixels transparent. 24-bit PNG's look great though.

Thanks

hi. thanks a lot for this code!
It's the best commented one and the best working one I have found!

when using proportional resizing, I wanted to have some changes.
if you set maxwidt=100px,maxheight=100px, the resultimage can be for example 100x75.
In my case I wanted that image to fixed to maxwidt and maxheight, and still have the picture propotional resized.
I have made it create a transparent frame that is fixed to maxwidth an maxheight, the propotional picture is then centered to that one.

look on the end of this page:(you should be able to see the code there without logging in)
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/...

Help I can't figure out how to use this excellent function to make multiple resizes and upload them to separate directories (for larger, medium-sized, and thumbnail images). Here is my code:

$full = $_FILES['upload']['tmp_name'][$number];      smart_resize_image( $full, $width = 400, $height = 0, 
$proportional = true, $output = 'file', 
$delete_original = true, $use_linux_commands = true );      
smart_resize_image( $full, $width = 240, $height = 0, $proportional = true, $output = '$display', $delete_original = true, $use_linux_commands = true );      
smart_resize_image( $display, $width = 120, $height = 0, $proportional = true, $output = '$thumb', $delete_original = true, $use_linux_commands = true );       
$success_full = move_uploaded_file($full, FULL_DIR.$file_name);
$success_display = move_uploaded_file($display, DISPLAY_DIR.$file_name);
$success_thumbs = move_uploaded_file($thumb, THUMB_DIR.$file_name); 

Sorry I know I'm a newbie at this kind of thing. I've tried DELETE_ORIGINAL = false, I've tried renaming the image files. No relief from my frustration.

[...] Smart Image Resizing while preserving Transparency with PHP and the GD Library Sweet, I’ll definitely have to get back to this one! [...]