imagesavealpha
(PHP 4 >= 4.3.2, PHP 5)
imagesavealpha — Set the flag to save full alpha channel information (as opposed to single-color transparency) when saving PNG images
說明
bool imagesavealpha
( resource $image
, bool $saveflag
)
imagesavealpha() sets the flag to attempt to save full alpha channel information (as opposed to single-color transparency) when saving PNG images.
You have to unset alphablending (imagealphablending($im, false)), to use it.
Alpha channel is not supported by all browsers, if you have problem with your browser, try to load your script with an alpha channel compliant browser, e.g. latest Mozilla.
參數
- image
-
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
- saveflag
-
Return值
如果成功則回傳 TRUE，失敗則回傳 FALSE。
註釋
Note: 本函式需要 GD 2.0.1 或更高版本（推薦 2.0.28 及更高版本）。