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    Set the flag to save full alpha channel information (as opposed to single-color transparency) when saving PNG images
    Image Functions
    PHP Manual

    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

    Description

    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.

    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).

    See Also

    Image Functions
    PHP Manual

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