Руководство по PHP
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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.

Замечание: Эта функция нуждается в GD версии 2.0.1 или выше.

See also imagecolorclosestalpha().

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imagecolorresolveУровень вышеimagecolorset