#19418 [Opn]: ImageCreateFromGD2Part() creates invalid img resource

From: Date: Thu, 19 Sep 2002 01:25:12 +0000
Subject: #19418 [Opn]: ImageCreateFromGD2Part() creates invalid img resource
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-19692@lists.php.net to get a copy of this message 
 ID:               19418
 User updated by:  sprice@wisc.edu
-Summary:          ImagePNG() error
 Reported By:      sprice@wisc.edu
 Status:           Open
 Bug Type:         GD related
 Operating System: Darwin (Mac OS X)
 PHP Version:      4.2.3
 New Comment:

If I copy the image to a new image resource, I can use ImagePNG() just
fine. I am changing the summerey to reflect that this is a
ImageCreateFromGD2Part() error and not a ImagePNG() error.

This is the changed script that works just fine:

<?php
header( "Content-type: image/png" );
header( "Expires: Mon, 26 Jul 1997 05:00:00 GMT" );
header( "Cache-Control: no-store, no-cache, must-revalidate" );
header( "Pragma: no-cache" );

$medimg = $_SERVER['DOCUMENT_ROOT'] .
"/riverdata/images/world_map_med.gd2";

$medimg = ImageCreateFromGD2Part( $medimg, 1, 1, 800, 600 );

$img = ImageCreateTrueColor( 800, 600 );
ImageCopy( $img, $medimg, 0, 0, 0, 0, 800, 600 );
ImageDestroy( $medimg );

//Send it out.
ImagePNG( $img );
ImageDestroy( $img );

?>


Previous Comments:
------------------------------------------------------------------------

[2002-09-15 12:58:13] sprice@wisc.edu

Here is the script that I am trying to run:
<?php
header( "Content-type: image/png" );
header( "Expires: Mon, 26 Jul 1997 05:00:00 GMT" );
header( "Cache-Control: no-store, no-cache, must-revalidate" );
header( "Pragma: no-cache" );


$medimg = $_SERVER['DOCUMENT_ROOT'] .
"/riverdata/images/world_map_med.gd2";
$img = ImageCreateFromGD2Part( $medimg, 1, 1, 800, 600 );

//Send it out.
ImagePNG( $img );
ImageDestroy( $img );

?>

When I load this script from the browser Chimera, it fails with the
error "The image “http://144.92.10.251/riverdata/test.php”
cannot be
displayed, because it contains errors."

When I load this script from the browser OmniWeb, it fails with this
error "Cannot Load Address; Attempted read off end of buffer"

I tried changing "ImagePNG( $img );" to "ImageJPEG( $img );" and the
content-type header to jpeg, and then it works.

ImagePNG() works in the rest of my scripts, which leads me to believe
that it may be a problem with the data recieved from
ImageCreateFromGD2Part().

If you want a .gd2 image for testing, you can use
"http://144.92.10.251/riverdata/images/world_map_med.gd2".
It is a 20
meg file of the earth.

------------------------------------------------------------------------


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