note 46030 added to function.imagecolortransparent

In fact this function can be used for two purposes: A.) to work with transparency while dealing with images in php (see watermark example) B.) to create a partially transparent picture For A.) one can work with truecolor images with some regulations, but B.) can only be used with palette-based images (= indexed = created with imagecreate not imagecreatetruecolor) and formats that support transparency (png, gif). For instance if you want to cut out a color out of a give picture that is in truecolor, use the following method to first convert it to palette-based image, assign the transparency and give it to the browser as png: <? $img = imagecreatefromjpeg('test.jpg'); imagetruecolortopalette($img, false, 256); // convert $white = imagecolorresolve($img, 255, 255, 255); // resolve given palette entry imagecolortransparent($img, $white); header("Content-type: image/png"); imagepng($img); ?> ---- Manual Page -- http://www.php.net/manual/en/function.imagecolortransparent.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+46030 Delete -- http://master.php.net/manage/user-notes.php?action=delete+46030&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+46030&report=yes Search -- http://master.php.net/manage/user-notes.php