Resized image (graph) is unreadable

[troubles]

Hi!

I have a image upload script for jpeg files which resizes the image to both thumbnails and preferable size. It works well on regular images, but when I try a black and white image of a grafh it gets unreadable. See attachment for an example.

The server uses PHP 4.4.2.

Is this fixable? Appreciate any help!

[NogDog]

Are you using [man]imagecopyresampled/man rather than [man]imagecopy/man to do the resizing?

[troubles]

thanks for your fast reply!

I'm using ImageCopyResized(). Is that a bad choice?

actual code:

$tmp_image=imagecreatefromjpeg($_FILES['image']['tmp_name']);
$width = imagesx($tmp_image);
$height = imagesy($tmp_image);

$new_width=80;
$new_height= round(($height/$width)*$new_width);
$new_image = imagecreatetruecolor($new_width,$new_height);
ImageCopyResized($new_image, $tmp_image,0,0,0,0, $new_width, $new_height, $width, $height);

//Grab new image
ob_start();
ImageJPEG($new_image,NULL,100);
$image_buffer = ob_get_contents();
ob_end_clean();
ImageDestroy($new_image);

//Create temporary file and write to it
$thumb = tmpfile();
fwrite($thumb, $image_buffer);
rewind($thumb);

[NogDog]

[man]imagecopyresampled/man will give you better quality, as it does some additional processing to smooth out the pixelation caused by resizing.

[troubles]

sweet! works like a charm! Thanks alot!