Note that a color allocated with imagecolorexactalpha won't show alpha (it will be opaque) when used with imageline(). Use imagerectangle() set to your normal start and end points instead.
Ensure that the image is created via imagecreatetruecolor() as well!
imagecolorexactalphaDescriptionint imagecolorexactalpha ( resource image, int red, int green, int blue, int alpha )Returns the index of the specified color+alpha in the palette of the image. If the color does not exist in the image's palette, -1 is returned.
See also imagecolorclosestalpha().
imagecolorexactalpha
matt at matt-darby dot com
11-Jul-2005 06:09
phpdoc-comment at aditus dot nu
08-Nov-2002 10:01
What might be misleading in the docs is that if the specified color + alpha channel does not exist it will be created. So if you like to use an alpha channel in your image enable alpha blending and then create you color using this method.
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imagecolorexact