#22323 [Opn->Fbk]: There's no way to output transparent truecolor PNG images

ID: 22323 Updated by: sniper@php.net Reported By: jukkaho at mail dot student dot oulu dot fi -Status: Open +Status: Feedback Bug Type: GD related Operating System: Linux PHP Version: 4.3.0 New Comment: Please try using this CVS snapshot: http://snaps.php.net/php4-STABLE-latest.tar.gz For Windows: http://snaps.php.net/win32/php4-win32-STABLE-latest.zip Previous Comments: ------------------------------------------------------------------------ [2003-02-20 04:24:57] jukkaho at mail dot student dot oulu dot fi Alpha channel in a truecolor image is only sent when im->saveAlphaFlag is true. It is by default set to false in gdImageCreateTrueColor() and there are no callers to gdImageSaveAlpha() to set it to any other value. I tested a hack where I call gdImageSaveAlpha() in PHP_FUNCTION(imagealphablending) and it worked mostly as expected. I'd guess that another function call is needed unless is it made to default behaviour and calls are embedded in PHP_FUNCTION(imagepng) etc. Only weird things that occured were that for some reason, target image alpha channel is discarded when blending other images to it. For example when blending fully transparent part over another fully transparent part resulted in a white area. White comes from destination image that's transparent too. Maybe I should open another bug for it? ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=22323&edit=1