PHP Handbuch
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# imagecolorclosestalpha

(PHP 4 >= 4.0.6)

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.

See also imagecolorexactalpha().

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

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