<?php
    $rgb = imagecolorat($pic, $px, $py);
    //获取指定点(像素)的rgb颜色
    $r = ($rgb >> 16) & 0xFF;
    $g = ($rgb >> 8) & 0xFF;
    $b = $rgb & 0xFF;
    //计算该点的反色
    $r = 255 - $r;
    $g = 255 - $g;
    $b = 255 - $b;
?>
(adsbygoogle = window.adsbygoogle || []).push({});