Bug #78923 [NEW]: Artifacts when convoluting image with transparency

From: cmb Operating system: * PHP version: 7.3.12 Package: GD related Bug Type: Bug Bug description:Artifacts when convoluting image with transparency Description: ------------ If gdImageConvolution() is applied to an image with a transparent background, there can be black pixel artifacts (at the upper edge of opaque parts, and at the top left of the image), what appears to be a bug. Test script: --------------- ext/gd/tests/bug47946.phpt Expected result: ---------------- No black pixels Actual result: -------------- Black pixel artifacts -- Edit bug report at https://bugs.php.net/bug.php?id=78923&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78923&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78923&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78923&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78923&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78923&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78923&r=support Expected behavior: https://bugs.php.net/fix.php?id=78923&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78923&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78923&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78923&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78923&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78923&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78923&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78923&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78923&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78923&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78923&r=mysqlcfg