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PHP Manual
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imagecolorexactalpha

(PHP 4 >= 4.0.6, PHP 5)

imagecolorexactalpha -- Get the index of the specified color + alpha

Description

int 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.

Note: This function requires GD 2.0.1 or later.

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