GD and Image 함수 목록
PHP Manual

imagecolortransparent

(PHP 4, PHP 5)

imagecolortransparentDefine a color as transparent

설명

int imagecolortransparent ( resource $image [, int $color ] )

Sets the transparent color in the given image .

인수

image

imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.

color

A color identifier created with imagecolorallocate().

반환값

The identifier of the new (or current, if none is specified) transparent color is returned.

예제

Example #1 imagecolortransparent() example

<?php
// Create a 55x30 image
$im imagecreatetruecolor(5530);
$red imagecolorallocate($im25500);
$black imagecolorallocate($im000);

// Make the background transparent
imagecolortransparent($im$black);

// Draw a red rectangle
imagefilledrectangle($im445025$red);

// Save the image
imagepng($im'./imagecolortransparent.png');
imagedestroy($im);
?>

위 예제의 출력 예시:

주의

Note: Transparency is copied only with imagecopymerge() and true color images, not with imagecopy() or pallete images.

Note: The transparent color is a property of the image, transparency is not a property of the color. Once you have set a color to be the transparent color, any regions of the image in that color that were drawn previously will be transparent.


GD and Image 함수 목록
PHP Manual