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# imagecolorclosestalpha

(PHP 4 >= 4.0.6, PHP 5)

imagecolorclosestalpha -- Get the index of the closest color to the specified color + alpha

## Description

int imagecolorclosestalpha ( resource image, int red, int green, int blue, int alpha )

Returns the index of the color in the palette of the image which is "closest" to the specified RGB value and alpha level.

> 注: This function requires GD 2.0.1 or later (2.0.28 or later is recommended).

See also imagecolorexactalpha().

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