imagecolordeallocate
imagecolorexactalpha
GD and Image Functions
PHP Manual

# imagecolorexact

(PHP 4, PHP 5, PHP 7)

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
PHP Manual