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Get the index of the specified color

imagecolordeallocate

imagecolorexactalpha

GD and Image Functions

imagecolorexact

(PHP 4, PHP 5)

imagecolorexact — Get the index of the specified color

Description

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

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

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

Parameters

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
red: Value of red component.
green: Value of green component.
blue: Value of blue component.

Return Values

Returns the index of the specified color in the palette, or -1 if the color does not exist.

Examples

Example #1 Get colors from the GD logo

 <?php
// Setup an image
$im = imagecreatefrompng('./gdlogo.png');

$colors   = Array();
$colors[] = imagecolorexact($im, 255, 0, 0);
$colors[] = imagecolorexact($im, 0, 0, 0);
$colors[] = imagecolorexact($im, 255, 255, 255);
$colors[] = imagecolorexact($im, 100, 255, 52);

print_r($colors);

// Free from memory
imagedestroy($im);
?>

The above example will output something similar to:

 Array (     [0] => 16711680     [1] => 0     [2] => 16777215     [3] => 6618932 )

See Also

imagecolorclosest() - Get the index of the closest color to the specified color

imagecolordeallocate

imagecolorexactalpha

GD and Image Functions