imagecolortransparent 处理后图片效果 不纯洁


<?php
$bg_img_path="E:/客户档案/xinhui/1_73202/XHB/SAM_1031.JPG"; //背景图片路径
$source_img_path="E:/客户档案/xinhui/sy.jpg";              //水印图片路径$bg_size=getimagesize($bg_img_path);
$source_size=getimagesize($source_img_path);
$bg_width_middle=($bg_size[0]-$source_size[0])/2;
$bg_height_middle=($bg_size[1]-$source_size[1])/2;
$bg_img=imagecreatefromjpeg($bg_img_path);
$bg_source=imagecreatefromjpeg($source_img_path);$transparent=imagecolorallocate($bg_source, 255, 255, 255);  
imagecolortransparent($bg_source,$transparent);   //这个处理后效果不佳imagecopymerge($bg_img,$bg_source,$bg_width_middle,$bg_height_middle,0,0,$source_size[0],$source_size[1],100);
imagecopyresized($bg_source,$bg_img,0,0,0,0,$source_size[0],$source_size[1],$bg_size[0],$bg_size[1]);
imagecopyresized($bg_img,$bg_source,0,0,0,0,500,593,120,54);
header("content-type:image/jpg");imagejpeg($bg_img);
?>处理前水印的背景为白色，处理后白色并没有，完全去除