imagecolordeallocate

(PHP 4, PHP 5)

imagecolordeallocate — De-allocate a color for an image

설명

bool imagecolordeallocate ( resource $image , int $color )

De-allocates a color previously allocated with imagecolorallocate() or imagecolorallocatealpha().

인수

image: imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.
color: The color identifier.

반환값

성공할 경우 TRUE를, 실패할 경우 FALSE를 반환합니다.

예제

Example #1 Using imagecolordeallocate()


<?php
$white = imagecolorallocate($im, 255, 255, 255);
imagecolordeallocate($im, $white);
?>

참고

imagecolorallocate() - Allocate a color for an image
imagecolorallocatealpha() - Allocate a color for an image

add a note User Contributed Notes imagecolordeallocate

janos at since78 dot net 01-Dec-2008 12:59


converting HTML color (like #AAED43) to three RGB values ($r = 170, $g = 237, $b = 67)

<?php

function html2rgb($color)

{

    if ($color[0] == '#')

        $color = substr($color, 1);



    if (strlen($color) == 6)

        list($r, $g, $b) = array($color[0].$color[1],

                                 $color[2].$color[3],

                                 $color[4].$color[5]);

    elseif (strlen($color) == 3)

        list($r, $g, $b) = array($color[0].$color[0], $color[1].$color[1], $color[2].$color[2]);

    else

        return false;



    $r = hexdec($r); $g = hexdec($g); $b = hexdec($b);



    return array($r, $g, $b);

}

?>



converting RGB values to HTML color

<?php

function rgb2html($r, $g=-1, $b=-1)

{

    if (is_array($r) && sizeof($r) == 3)

        list($r, $g, $b) = $r;



    $r = intval($r); $g = intval($g);

    $b = intval($b);



    $r = dechex($r<0?0:($r>255?255:$r));

    $g = dechex($g<0?0:($g>255?255:$g));

    $b = dechex($b<0?0:($b>255?255:$b));



    $color = (strlen($r) < 2?'0':'').$r;

    $color .= (strlen($g) < 2?'0':'').$g;

    $color .= (strlen($b) < 2?'0':'').$b;

    return '#'.$color;

}

?>

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