(PHP 4, PHP 5)
imagecolordeallocate — 取消图像颜色的分配
$image
, int $color
)imagecolordeallocate() 函数取消先前由 imagecolorallocate() 或 imagecolorallocatealpha() 分配的颜色。
<?php
$white = imagecolorallocate($im, 255, 255, 255);
imagecolordeallocate($im, $white);
?>
janos at since78 dot net (2008-12-01 07:59:12)
converting HTML color (like #AAED43) to three RGB values ($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;
}
?>