GD and Image 함수 목록
PHP Manual

imagecolorexactalpha

(PHP 4 >= 4.0.6, PHP 5)

imagecolorexactalphaGet 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();
$colors[] = imagecolorexactalpha($im255000);
$colors[] = imagecolorexactalpha($im000127);
$colors[] = imagecolorexactalpha($im25525525555);
$colors[] = imagecolorexactalpha($im1002555220);

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


GD and Image 함수 목록
PHP Manual