imagecolormatch
imagecolorresolvealpha
GD and Image Functions
PHP Manual

# imagecolorresolve

(PHP 4, PHP 5, PHP 7)

imagecolorresolve — Get the index of the specified color or its closest possible alternative

### Description

int imagecolorresolve ( resource `$image` , int `$red` , int `$green` , int `$blue` )

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

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 a color index.

### Examples

Example #1 Using imagecoloresolve() to get colors from an image

`<?php
// Load an image
$im = imagecreatefromgif('phplogo.gif');
// Get closest colors from the image
$colors = array();
$colors[] = imagecolorresolve($im, 255, 255, 255);
$colors[] = imagecolorresolve($im, 0, 0, 200);
// Output
print_r($colors);
imagedestroy($im);
?>`

The above example will output something similar to:

    Array
    (
        [0] => 89
        [1] => 85
    )

### See Also

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

imagecolormatch
imagecolorresolvealpha
GD and Image Functions
PHP Manual