GD Функции
PHP Manual

imagealphablending

(PHP 4 >= 4.0.6, PHP 5)

imagealphablendingSet the blending mode for an image

Описание

bool imagealphablending ( resource $image , bool $blendmode )

imagealphablending() allows for two different modes of drawing on truecolor images. In blending mode, the alpha channel component of the color supplied to all drawing function, such as imagesetpixel() determines how much of the underlying color should be allowed to shine through. As a result, gd automatically blends the existing color at that point with the drawing color, and stores the result in the image. The resulting pixel is opaque. In non-blending mode, the drawing color is copied literally with its alpha channel information, replacing the destination pixel. Blending mode is not available when drawing on palette images.

Параметри

image

Ресурс на изображение, върнат от някоя от функциите за създаване на изображения като например imagecreatetruecolor().

blendmode

Whether to enable the blending mode or not. Default to FALSE.

Връщани стойности

Връща TRUE при успех или FALSE при неуспех.

Примери

Example #1 imagealphablending() usage example

<?php
// Create image
$im imagecreatetruecolor(100100);

// Set alphablending to on
imagealphablending($imtrue);

// Draw a square
imagefilledrectangle($im30307070imagecolorallocate($im25500));

// Output
header('Content-type: image/png');

imagepng($im);
imagedestroy($im);
?>

Бележки

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


GD Функции
PHP Manual