#28949 [Opn]: imagetruecolortopalette - colors in palette are missing and filled with white
ID: 28949
User updated by: vkary at web dot de
Reported By: vkary at web dot de
Status: Open
Bug Type: GD related
Operating System: WinXP & Linux
PHP Version: 4.3.7
New Comment:
I have found a difference between the PHP 4.3.2 and PHP 4.3.7 in the
file "gd_topal.c"
gd_topal.c, PHP 4.3.2, lines 733-742
-------------------------------------
#ifdef ORIGINAL_LIB_JPEG
cinfo->colormap[0][icolor] = (JSAMPLE) ((c0total + (total >> 1)) /
total);
cinfo->colormap[1][icolor] = (JSAMPLE) ((c1total + (total >> 1)) /
total);
cinfo->colormap[2][icolor] = (JSAMPLE) ((c2total + (total >> 1)) /
total);
#else
im->red[icolor] = (int) ((c0total + (total >> 1)) / total);
im->green[icolor] = (int) ((c1total + (total >> 1)) / total);
im->blue[icolor] = (int) ((c2total + (total >> 1)) / total);
#endif
}
gd_topal.c, PHP 4.3.7, lines 733-748
-------------------------------------
#ifdef ORIGINAL_LIB_JPEG
cinfo->colormap[0][icolor] = (JSAMPLE) ((c0total + (total >> 1)) /
total);
cinfo->colormap[1][icolor] = (JSAMPLE) ((c1total + (total >> 1)) /
total);
cinfo->colormap[2][icolor] = (JSAMPLE) ((c2total + (total >> 1)) /
total);
#else
/* 2.0.16: Paul den Dulk found an occasion where total can be 0 */
if (count) {
im->red[icolor] = (int) ((c0total + (total >> 1)) / total);
im->green[icolor] = (int) ((c1total + (total >> 1)) / total);
im->blue[icolor] = (int) ((c2total + (total >> 1)) / total);
} else {
im->red[icolor] = 255;
im->green[icolor] = 255;
im->blue[icolor] = 255;
}
#endif
Previous Comments:
------------------------------------------------------------------------
[2004-06-28 18:27:19] vkary at web dot de
Description:
------------
When trying to reduce a true color image to a palette image with for
example 16 or 32 colors, many colors are missing from the palette and
filled with white color instead.
Reproduce code:
---------------
<?php
$src_im = imagecreatefromjpeg ("ara.jpg");
imagetruecolortopalette ($src_im, false, 16);
Header("Content-type: image/png");
imagepng($src_im);
?>
Expected result:
----------------
The color palette should have exactly the number of colors specified in
imagetruecolortopalette (16 for example) an the color reduced image
should look like this:(created with PHP 4.3.2, GD-Lib 2.0.12)
http://www.textilenetwork.de/php/ara16_4_3_2.png
The color palette for the image above:
http://www.textilenetwork.de/php/ara16_4_3_2_pal.png
or for 32 colors:
http://www.textilenetwork.de/php/ara32_4_3_2.png
http://www.textilenetwork.de/php/ara32_4_3_2_pal.png
Actual result:
--------------
The images and color palettes with PHP 4.3.6: (& PHP 4.3.7)
http://www.textilenetwork.de/php/ara16_4_3_6.png
http://www.textilenetwork.de/php/ara16_4_3_6_pal.png
http://www.textilenetwork.de/php/ara32_4_3_6.png
http://www.textilenetwork.de/php/ara32_4_3_6_pal.png
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=28949&edit=1
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