Bug #79287 [NEW]: imagewebp function quality parametter as no effect

From: pierre at lookit dot fr Operating system: xubuntu 18.04.4 LTS PHP version: 7.2.27 Package: GD related Bug Type: Bug Bug description:imagewebp function quality parametter as no effect Description: ------------ When i change the quality parameter in the imagewebp function, the image returned is exactly the same. This parameter seems to have no effect on the conversion process. I've tested with jpeg and png images files. The file is well converted, but when i change the quality parameter to another value, nothing appear to change on image resulted. Test script: --------------- $destination = '1.webp'; $origine = '1.png'; @$webp = imagewebp(imagecreatefrompng($origine), $destination); $destination = '2.webp'; $origine = '2.jpg'; @$webp = imagewebp(imagecreatefromjpeg($origine), $destination); $destination = '3.webp'; $origine = '1.png'; @$webp = imagewebp(imagecreatefrompng($origine), $destination,50); $destination = '4.webp'; $origine = '2.jpg'; @$webp = imagewebp(imagecreatefromjpeg($origine), $destination, 50); //Ok after that i open results in photoshop for a deeper analyse on change....but nothing appear to have changed !!! -- Edit bug report at https://bugs.php.net/bug.php?id=79287&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79287&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79287&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79287&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79287&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79287&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79287&r=support Expected behavior: https://bugs.php.net/fix.php?id=79287&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79287&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79287&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79287&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79287&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79287&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79287&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79287&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79287&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79287&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79287&r=mysqlcfg