imagecolorexact
imagecolormatch
GD and Image 함수 목록
PHP Manual

# imagecolorexactalpha

(PHP 4 >= 4.0.6, PHP 5)

imagecolorexactalpha — Get the index of the specified color + alpha

### 설명

int imagecolorexactalpha ( resource `$image` , int `$red` , int `$green` , int `$blue` , int `$alpha` )

Returns the index of the specified color+alpha in the palette of the image.

### 인수

`image`

  imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.

`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.

### 반환값

Returns the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette.

### 예제

Example #1 Get colors from the GD logo

`<?php
// Setup an image
$im = imagecreatefrompng('./gdlogo.png');
$colors = Array();
$colors[] = imagecolorexactalpha($im, 255, 0, 0, 0);
$colors[] = imagecolorexactalpha($im, 0, 0, 0, 127);
$colors[] = imagecolorexactalpha($im, 255, 255, 255, 55);
$colors[] = imagecolorexactalpha($im, 100, 255, 52, 20);
print_r($colors);
// Free from memory
imagedestroy($im);
?>`

위 예제의 출력 예시:

    Array
    (
        [0] => 16711680
        [1] => 2130706432
        [2] => 939524095
        [3] => 342163252
    )

### 주의

> Note: 이 함수는 GD 2.0.1 이상이 필요합니다. (2.0.28 이상을 권장합니다)

### 참고

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

imagecolorexact
imagecolormatch
GD and Image 함수 목록
PHP Manual