[edit] Last updated: Fri, 18 Sep 2009

imagecolorresolvealpha

(PHP 4 >= 4.0.6, PHP 5)

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

Описание

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.

Параметри

image: Ресурс на изображение, върнат от някоя от функциите за създаване на изображения като например 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.

Връщани стойности

Returns a color index.

Примери

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);
?>

Примерът по-горе ще изведе нещо подобно на:

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

Бележки

Забележка: Тази функция изисква GD 2.0.1 или по-нова (препоръчва се 2.0.28 или по-нова).

Вж. също

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

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