imagecolorat
(PHP 4, PHP 5)
imagecolorat — Get the index of the color of a pixel
설명
int imagecolorat
( resource $image
, int $x
, int $y
)
Returns the index of the color of the pixel at the specified location in the image specified by image .
If PHP is compiled against GD library 2.0 or higher and the image is a truecolor image, this function returns the RGB value of that pixel as integer. Use bitshifting and masking to access the distinct red, green and blue component values:
매개변수
- font
-
내장 글꼴 1, 2, 3, 4, 5(큰 숫자가 큰 글꼴)나 imageloadfont()로 등록한 글꼴 식별자를 사용할 수 있습니다.
- x
-
x-coordinate of the point
- y
-
y-coordinate of the point
반환값
Returns the index of the color.
예제
Example#1 Access distinct RGB values
<?php
$im = imagecreatefrompng("php.png");
$rgb = imagecolorat($im, 10, 15);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
?>
위 예제의 출력 예:
int(119) int(123) int(180)