June 8th, 2004, 07:12 PM
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Join Date: Jun 2004
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GD Jpeg Resize looks like 4bit image from IIS
Hi guys, why is it the first post I always do is a question and not an answer??!
OK I have some code that I was given by a developer that used to work with me that resized a .jpg once uploaded to a website.
The thing is it works fine on my Raq4, the image is a nice resolution and is totally presentable to visitors. I use IIS (shhh don't tell anyone) as a development server and the same code is producing some really bad looking images.
Enclosed is the 'offending' code... I think, as the rest that the form does is some db entries, and of course the image upload, which works fine as the original image that is uploaded is fully ok.
Please advise...
PHP Code:
function resize_jpeg( $image_file_path, $new_image_file_path, $max_width=480, $max_height=1600 )
{
/*
* resize_jpeg takes in a local image and outputs a resized copy.
* you send the full unix path, including filename, to the local
* image (a relative path will work, too),
* the full path to the new, smaller image, and the maximum width
* and height you'd like the image to be constrained within.
* the script will not distort the image at all, except for the
* standard degradation of the image through resizing.
* returns TRUE or FALSE
*
* ex: resize_jpeg ( "/home/allah/images/blah.jpg", "/home/allah/images/small_blah.jpg", 300 );
* ex: resize_jpeg ( "../images/yikes.jpg", "../images/800x800_yikes.jpg", 800, 800 );
*/
$return_val = 1;
$return_val = ( ($img = ImageCreateFromJPEG ( $image_file_path )) && $return_val == 1 ) ? "1" : "0";
$FullImage_width = imagesx ($img); // Original image width
$FullImage_height = imagesy ($img); // Original image height
// now we check for over-sized images and pare them down
// to the dimensions we need for display purposes
$ratio = ( $FullImage_width > $max_width ) ? (real)($max_width / $FullImage_width) : 1 ;
$new_width = ((int)($FullImage_width * $ratio)); //full-size width
$new_height = ((int)($FullImage_height * $ratio)); //full-size height
//check for images that are still too high
$ratio = ( $new_height > $max_height ) ? (real)($max_height / $new_height) : 1 ;
$new_width = ((int)($new_width * $ratio)); //mid-size width
$new_height = ((int)($new_height * $ratio)); //mid-size height
// --Start Full Creation, Copying--
// now, before we get silly and 'resize' an image that doesn't need it...
if ( $new_width == $FullImage_width && $new_height == $FullImage_height )
copy ( $image_file_path, $new_image_file_path );
$full_id = ImageCreate( $new_width , $new_height ); //create an image
ImageCopyResized( $full_id, $img,
0,0, 0,0, //starting points
$new_width, $new_height,
$FullImage_width, $FullImage_height );
$return_val = ( $full = ImageJPEG( $full_id, $new_image_file_path, 80 )
&& $return_val == 1 ) ? "1" : "0";
ImageDestroy( $full_id );
// --End Creation, Copying--
return ($return_val) ? TRUE : FALSE ;
}
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