用php删除图像背景并保存透明png

问题描述

我想删除在PHP平台上工作的网站上上传的所有图像的白色背景.上载功能已完成，但将其弄乱了.

I want to remove the white background of any image uploaded on the site working on PHP platform. The uploading function is done but messed up with this functionality.

这是我在这里找到的链接:从图像中删除白色背景并使其透明

Here is the link I found here:Remove white background from an image and make it transparent

但这是相反的.我要删除彩色背景，并使其具有透明背景图像.

But this is doing reverse. I want to remove the colored background and make it image with transparent background.

推荐答案

由于只需要单色透明性，所以最简单的方法是用imagecolortransparent()定义白色.这样的东西(未经测试的代码):

Since you only need single-color transparency, the easiest way is to define white with imagecolortransparent(). Something like this (untested code):

$img = imagecreatefromstring($your_image); //or whatever loading function you need
$white = imagecolorallocate($img, 255, 255, 255);
imagecolortransparent($img, $white);
imagepng($img, $output_file_name);

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