Bug #81321 [NEW]: incorrect image on save

From: andrei at anleaf dot com Operating system: CentOs 7.9 PHP version: 7.4.22 Package: *Graphics related Bug Type: Bug Bug description:incorrect image on save Description: ------------ problem with opening and saving some png images using imagecreatefrompng() and then save it using imagepng($image,$file). Image opens OK but when saved, the resulting image has broken alpha channel. Happens with some png images. Input image to test is here https://www.dropbox.com/s/c6ne72bobrt2iz9/logo_orig.png?dl=0 Resulting image with problem is here https://www.dropbox.com/s/xs4b4bv6208hiua/logo_new.png?dl=0 Test script: --------------- $im = imagecreatefrompng("logo_orig.png"); imagepng($im,"logo_new.png"); imagedestroy($im); Expected result: ---------------- saved image should look the same as an input image Actual result: -------------- saved image is completely distorted. -- Edit bug report at https://bugs.php.net/bug.php?id=81321&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=81321&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=81321&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=81321&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=81321&r=needscript Try newer version: https://bugs.php.net/fix.php?id=81321&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=81321&r=support Expected behavior: https://bugs.php.net/fix.php?id=81321&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=81321&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=81321&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=81321&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=81321&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=81321&r=dst IIS Stability: https://bugs.php.net/fix.php?id=81321&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=81321&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=81321&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=81321&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=81321&r=mysqlcfg