(PHP 4, PHP 5, PHP 7)
imagecolorallocate — 为一锟斤拷图锟斤拷锟斤拷锟斤拷锟缴�
$image
, int $red
, int $green
, int $blue
) : int
imagecolorallocate() 锟斤拷锟斤拷一锟斤拷锟斤拷识锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟缴革拷锟斤拷锟斤拷
RGB 锟缴凤拷锟斤拷傻锟斤拷锟缴拷锟�red锟斤拷green 锟斤拷
blue 锟街憋拷锟斤拷锟斤拷锟斤拷要锟斤拷锟斤拷色锟侥红，锟教ｏ拷锟斤拷锟缴分★拷锟斤拷些锟斤拷锟斤拷锟斤拷
0 锟斤拷 255 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷十锟斤拷锟斤拷锟狡碉拷 0x00 锟斤拷 0xFF锟斤拷imagecolorallocate()
锟斤拷锟诫被锟斤拷锟斤拷锟皆达拷锟斤拷每一锟斤拷锟斤拷锟斤拷 image 锟斤拷锟斤拷锟斤拷锟酵硷拷锟斤拷械锟斤拷锟缴拷锟�
Note:
锟斤拷一锟轿讹拷 imagecolorallocate() 锟侥碉拷锟矫伙拷锟斤拷锟斤拷诘锟缴拷锟斤拷图锟斤拷锟斤拷浔筹拷锟缴拷锟斤拷锟斤拷锟� imagecreate() 锟斤拷锟斤拷锟斤拷图锟斤拷
Example #1 imagecolorallocate() 锟斤拷锟斤拷
<?php
$im = imagecreate('example.jpg', 100, 100);
// 锟斤拷锟斤拷锟斤拷为锟斤拷色
$background = imagecolorallocate($im, 255, 0, 0);
// 锟借定一些锟斤拷色
$white = imagecolorallocate($im, 255, 255, 255);
$black = imagecolorallocate($im, 0, 0, 0);
// 十锟斤拷锟斤拷锟狡凤拷式
$white = imagecolorallocate($im, 0xFF, 0xFF, 0xFF);
$black = imagecolorallocate($im, 0x00, 0x00, 0x00);
?>
锟斤拷锟斤拷锟斤拷锟绞э拷锟斤拷蚍祷锟� -1锟斤拷
锟轿硷拷 imagecolorallocatealpha() 锟斤拷 imagecolordeallocate()锟斤拷