Get the index of the specified color + alpha or its closest possible alternative

Descripción

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.

Lista de parámetros

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.
alpha: A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.

The colors parameters are integers between 0 and 255 or hexadecimals between 0x00 and 0xFF.

Valores retornados

Returns a color index.

Ejemplos

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


<?php
// Load an image
$im = imagecreatefromgif('phplogo.gif');

// Get closest colors from the image
$colors = array();
$colors[] = imagecolorresolvealpha($im, 255, 255, 255, 0);
$colors[] = imagecolorresolvealpha($im, 0, 0, 200, 127);

// Output
print_r($colors);

imagedestroy($im);
?>

El resultado del ejemplo seria algo similar a:

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

Notes

Note: Esta funcion requiere GD 2.0.1 o posterior.

Ver también

imagecolorclosestalpha() - Get the index of the closest color to the specified color + alpha