ID:               48123
 Updated by:       j...@php.net
 Reported By:      vincent dot k dot hughitt at nasa dot gov
-Status:           Open
+Status:           Assigned
 Bug Type:         GD related
-Operating System: Ubuntu 9.04, Fedora 11
+Operating System: *
-PHP Version:      5.2.9
+PHP Version:      5.*, 6CVS (2009-04-30)
-Assigned To:      
+Assigned To:      pajoye
 New Comment:

Verified with latest CVS, using bundled GD library.


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

[2009-04-30 18:11:51] vincent dot k dot hughitt at nasa dot gov

Hi Pajoye,

Thanks for the feedback. I did not know that about Ubuntu/Fedora's
packaged versions of GD. I will try downloading and compiling PHP from
source and see if I run into the same issues, and post my results here.

If you start with the images:

http://launchpadlibrarian.net/26034594/eit_grayscale.png
http://launchpadlibrarian.net/26034597/ctable_eit304.png

The expected output of the script is:

http://launchpadlibrarian.net/26034598/eit_final_ubuntu810.jpg

which is a COLOR image. The problem is that using newer version of PHP,
the result is a GRAYSCALE image.

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

[2009-04-30 17:33:11] paj...@php.net

and what do you expect as "correct" result? for this script.

And please not that both Debian and Ubuntu do not use the bundled GD as
it is recommended and the GD version they use is in a poor state (ubuntu
being less worst).

Please try the same using a normal php too, compiling it with the
bundled GD.

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

[2009-04-30 16:46:10] vincent dot k dot hughitt at nasa dot gov

Description:
------------
I wrote a small piece of code using that uses the GD module to apply a
color-table to a gray-scale image.

In newer versions of PHP, however, the script only outputs grayscale
images, with no error message.

Furthermore, outputting the contents of imagecolorsforindex shows that
the script is still reading the palette properly, so it must have
something to do with the next step (imagecolorset).

Any ideas?

===========================================================
System 1 (non-working): 

Ubuntu 9.04 Linux 2.6.28-11-generic
PHP 5.2.6-3ubuntu4.1 with Suhosin-Patch 0.9.6.2 (cli) (built: Apr 23
2009 14:35:05)
gd 2.0.36~rc1~dfsg-3ubuntu1

===========================================================

System 2 (non-working):

Fedora 11 Beta Linux 2.6.29.1-111.fc11.i586
PHP 5.2.9
gd 2.0.35

===========================================================

System 3 (WORKING):
Ubuntu 8.10 Linux 2.6.27-11-generic
PHP 5.2.6-2ubuntu4.1 with Suhosin-Patch 0.9.6.2 (cli) (built: Feb 11
2009 20:38:24)
gd 2.0.36~rc1~dfsg-3ubuntu1

===========================================================

(Originally reported downstream at:
https://bugs.edge.launchpad.net/ubuntu/+source/php5/+bug/368036)

Reproduce code:
---------------
/**
 * Takes a grayscale PNG and modifies it's index to use 256-color 
 * lookup table then outputs it as an 8-bit JPEG image, or 8-bit 
 * paletted PNG.
 *
 * Sample image and color-table:
 *
 * http://launchpadlibrarian.net/26034594/eit_grayscale.png
 * http://launchpadlibrarian.net/26034597/ctable_eit304.png
 */

$gd = imagecreatefrompng("eit_grayscale.png");
$ctable = imagecreatefrompng("ctable_eit304.png");

for ($i = 0; $i <= 255; $i++) {
 $rgba = imagecolorsforindex($ctable, $i);
 imagecolorset($gd, $i, $rgba["red"], $rgba["green"], $rgba["blue"]);
}

imagejpeg($gd, "eit_final.jpg", 75);
imagedestroy($gd);
imagedestroy($ctable);

Expected result:
----------------
Outputs a 8-bit color JPEG.
(http://launchpadlibrarian.net/26034598/eit_final_ubuntu810.jpg)

Actual result:
--------------
Outputs a 8-bit grayscale JPEG.
(http://launchpadlibrarian.net/26034602/eit_final_ubuntu904.jpg)


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


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