imagecolorexactalpha

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

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

Red 컴포넌트 값.

green

Green 컴포넌트 값.

blue

Blue 컴포넌트 값.

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
)

참고

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User Contributed Notes 2 notes

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1
matt at matt-darby dot com
16 years ago
Note that a color allocated with imagecolorexactalpha won't show alpha (it will be opaque) when used with imageline(). Use imagerectangle() set to your normal start and end points instead.

Ensure that the image is created via imagecreatetruecolor() as well!
up
-1
phpdoc-comment at aditus dot nu
19 years ago
What might be misleading in the docs is that if the specified color + alpha channel does not exist it will be created. So if you like to use an alpha channel in your image enable alpha blending and then create you color using this method.
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