   #PHP Manual Image functions image2wbmp imageantialias

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                              imagealphablending

   (PHP 4 >= 4.0.6)
   imagealphablending -- Set the blending mode for an image

Description

   bool imagealphablending ( resource image, bool blendmode)

   imagealphablending() allows for two different modes of drawing on
   truecolor images. In blending mode, the alpha channel component of the
   color supplied to all drawing function, such as imagesetpixel()
   determines how much of the underlying color should be allowed to shine
   through. As a result, gd automatically blends the existing color at
   that point with the drawing color, and stores the result in the image.
   The resulting pixel is opaque. In non-blending mode, the drawing color
   is copied literally with its alpha channel information, replacing the
   destination pixel. Blending mode is not available when drawing on
   palette images. If blendmode is TRUE, then blending mode is enabled,
   otherwise disabled. Returns TRUE on success or FALSE on failure.

     Note: This function was added in PHP 4.0.6 and requires GD 2.0.1
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