Bug #73317 [NEW]: image2wbmp() interprets $threshold as $fg

From: cmb Operating system: * PHP version: 5.6.26 Package: GD related Bug Type: Bug Bug description:image2wbmp() interprets $threshold as $fg Description: ------------ The $threshold parameter of image2wbmp() is supposed to specify the brightness threshold for the necessary black/white conversion. However, as of commit cb5c9156[1], $threshold is interpreted as the color which is used as foreground color. As this behavioral change has been introduced with PHP 5.0.0 it might seem best to change the documentation accordingly to avoid a BC break. However, as it's now image2wbmp() basically behaves identical to imagewbmp() (the latter also allows to pass a stream as second parameter as of PHP 5.4.0), and as such makes no sense at all. Furthermore, there is no readily available solution for converting an image to black and white according to a given threshold, what appears to be required for general WBMP support. Applying imagefilter() with IMG_FILTER_CONTRAST and IMG_FILTER_GRAYSCALE might deliver this functionality, though. And of course, one could output the image as PNG and use png2wbmp(). [1] <http://git.php.net/?p=php-src.git;a=commit;h=cb5c9156c233a260e7a588141863720de82d2926> Test script: --------------- <?php $im = imagecreate(100, 100); imagecolorallocate($im, 0, 0, 0); $white = imagecolorallocate($im, 255, 255, 255); $red = imagecolorallocate($im, 255, 0, 0); $light = imagecolorallocate($im, 192, 192, 192); $dark = imagecolorallocate($im, 64, 64, 64); imagefilledellipse($im, 25, 25, 40, 40, $white); imagefilledellipse($im, 75, 25, 40, 40, $red); imagefilledellipse($im, 25, 75, 40, 40, $light); imagefilledellipse($im, 75, 75, 40, 40, $dark); image2wbmp($im, __DIR__ . DIRECTORY_SEPARATOR . 'image2wbmp.wbmp', $dark); Expected result: ---------------- An image with black background and two white circles in the upper and lower left quadrant, respectively. Actual result: -------------- An image with white background and a single black circle in the lower right quadrant. -- Edit bug report at https://bugs.php.net/bug.php?id=73317&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73317&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73317&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73317&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=73317&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=73317&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=73317&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=73317&r=needscript Try newer version: https://bugs.php.net/fix.php?id=73317&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=73317&r=support Expected behavior: https://bugs.php.net/fix.php?id=73317&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=73317&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=73317&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=73317&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73317&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=73317&r=dst IIS Stability: https://bugs.php.net/fix.php?id=73317&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=73317&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=73317&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=73317&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=73317&r=mysqlcfg