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PHP Manual
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imagecolorresolvealpha

(PHP 4 >= 4.0.6, PHP 5)

imagecolorresolvealpha -- Get the index of the specified color + alpha or its closest possible alternative

Description

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

This function is guaranteed to return a color index for a requested color, either the exact color or the closest possible alternative.

Note: This function requires GD 2.0.1 or later.

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