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imageconvolution
GD and Image 함수 목록
PHP Manual

# imagecolortransparent

(PHP 4, PHP 5)

imagecolortransparent — Define 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(55, 30);
$red = imagecolorallocate($im, 255, 0, 0);
$black = imagecolorallocate($im, 0, 0, 0);
// Make the background transparent
imagecolortransparent($im, $black);
// Draw a red rectangle
imagefilledrectangle($im, 4, 4, 50, 25, $red);
// Save the image
imagepng($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.

imagecolorstotal
imageconvolution
GD and Image 함수 목록
PHP Manual