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.
Parameters
-
image
An image resource, returned by one of the image creation functions,
such as imagecreatetruecolor().
- saveflag
Return Values
Returns TRUE
on success or FALSE
on failure.
Notes
Note: This function requires GD 2.0.1 or later (2.0.28 or later is recommended).