imagealphablending

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

imagealphablending — Set the blending mode for an image

설명

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.

인수

image: imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.
blendmode: Whether to enable the blending mode or not. On true color images the default value is TRUE otherwise the default value is FALSE

반환값

성공 시 TRUE를, 실패 시 FALSE를 반환합니다.

예제

Example #1 imagealphablending() usage example


<?php
// Create image
$im = imagecreatetruecolor(100, 100);

// Set alphablending to on
imagealphablending($im, true);

// Draw a square
imagefilledrectangle($im, 30, 30, 70, 70, imagecolorallocate($im, 255, 0, 0));

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

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

주의

Note: 이 함수는 GD 2.0.1 이후 버전이 필요합니다. (2.0.28 이후를 권장합니다)