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PHP Manual

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imagecolorexact

(PHP 3, PHP 4, PHP 5)

imagecolorexact -- Get the index of the specified color

int imagecolorexact ( resource image, int red, int green, int blue )

Returns the index of the specified color in the palette of the image.

If the color does not exist in the image's palette, -1 is returned.

If you created the image from a file, only colors used in the image are resolved. Colors present only in the pallete are not resolved.

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