PHP: imagesavealpha

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.

Note: This function requires GD 2.0.1 or later.

See also imagealphablending().

User Contributed Notes
imagesavealpha

doggz at mindless dot com
05-Oct-2003 11:50


To use PNG-24 in IE 5.5+ try:

<img alt="Transparant PNG" src="myimage.gif" style="width: 200px; height: 200px; filter:progid:

DXImageTransform.Microsoft.AlphaImageLoader(src='myimage.png', sizingMethod='scale')" />



there is more info available at http://people.brandeis.edu/~peelle/png/

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