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Oct 2nd, 2008

GD imagepng function produce corrupted image file

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Hi all ,
what i want to do is to resample my large image into smaller resolution image and save it on the server, but the output image is corrupted when i open it in windows image viewer

please help me , here is the code .

php Syntax (Toggle Plain Text)
 
// The file
$filename = 'd.png';
$percent = 0.5;
 
// Content type
 
 
// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = 400;
$new_height = 400;
 
// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefrompng($filename);
imagealphablending($im_dest, false);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagesavealpha($image_p, true);
// Output
imagepng($image_e,'aa.png',0);
// The file
$filename = 'd.png';
$percent = 0.5;

// Content type
 

// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = 400;
$new_height = 400;

// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefrompng($filename);
imagealphablending($im_dest, false);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagesavealpha($image_p, true);
// Output
imagepng($image_e,'aa.png',0);

the output image is attached too ,

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Last edited by msi_333; Oct 2nd, 2008 at 12:12 am.

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Oct 2nd, 2008

Re: GD imagepng function produce corrupted image file

maybe you are having the same problem as this guy:
http://us.php.net/manual/en/function.imagepng.php#79150

Quote ...

So instead of just
imagepng($image); //DIDNT WORK--CORUPT IMAGE

This worked
imagepng($image,NULL,0,NULL);

Last edited by R0bb0b; Oct 2nd, 2008 at 12:49 am.

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Oct 2nd, 2008

Re: GD imagepng function produce corrupted image file

Found your problem which I had too when I did my first GD script the last line is incorrect as it has an unsigned variable within the function.

php Syntax (Toggle Plain Text)
imagepng($image_e,'aa.png',0);
imagepng($image_e,'aa.png',0);

So replace the above with below

php Syntax (Toggle Plain Text)
imagepng($image_p,'aa.png',0);
imagepng($image_p,'aa.png',0);

Notice the letter 'e' in the first box and the letter 'p' in the second box (after the word image). That is your bug. Although your script shows the letter 'e', it needs to be replaced with the letter 'p'. So the overall code will be:

php Syntax (Toggle Plain Text)
 
// The file
$filename = 'd.png';
$percent = 0.5;
 
// Content type
 
 
// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = 400;
$new_height = 400;
 
// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefrompng($filename);
imagealphablending($im_dest, false);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagesavealpha($image_p, true);
// Output
imagepng($image_p,'aa.png',0); //this is the line that has been changed
       
// The file
$filename = 'd.png';
$percent = 0.5;
 
// Content type
 
 
// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = 400;
$new_height = 400;

// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefrompng($filename);
imagealphablending($im_dest, false);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagesavealpha($image_p, true);
// Output
imagepng($image_p,'aa.png',0); //this is the line that has been changed

cwarn23

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Oct 2nd, 2008

Re: GD imagepng function produce corrupted image file

thank you

, how to make the quality of the output image maximum ?

Last edited by msi_333; Oct 2nd, 2008 at 10:59 am.

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