在PHP中合并两个透明图像时的异常结果 [英] Unusual result when merging two transparent images in php

问题描述

我想知道我做错什么了吗，或者是否能像我得到的结果一样好.左侧的两个PNG均为95x111.机器人的图像周围有5像素左右的透明像素填充，但是合并时似乎会引起问题?

Im wondering if I'm doing something wrong, or if this is as good a result as im going to get. Both PNGs on the left are 95x111. The image of the robot has a 5px or so padding of transparent pixels around it, but it seems to be causing problems when they merge?

 $avatar = imagecreatefrompng("../guy.png");
 $borderImg = imagecreatefrompng("../frame.png");

 imagealphablending( $borderImg, false );
 imagesavealpha( $borderImg, true );

 imagecopyresampled($avatar,$borderImg,  0, 0, 0, 0, 95, 111,95, 111);
 imagepng($avatar, $newfilenameBig); 

我尝试了所有我能想到的imagealphablending和imagesavealpha组合.当我将$ avatar设置为imagesavealpa = true时，它甚至不显示所有图像，仅显示框架.看起来不奇怪吗? 就我将要使用PHP GD而言，这是吗?

Ive tried every combo of imagealphablending and imagesavealpha I can think of. When I set $avatar to imagesavealpa= true, then it doesnt even show the image as all, just the frame. Doesn't that seem strange? Is this as far as i'm gonna get using PHP GD?

更新:当使用24位模式在PS中手动创建两个图像时，可以实现所需的结果.有没有办法使用imagecopy或类似方法做到这一点?

UPDATE: The desired result can be achieved when both images are created manually in PS using 24 bit mode. Is there a way to do this using imagecopy or similar?

推荐答案

尝试以下代码可以正常工作.

Try the following code its working fine.

    $width = 95;
    $height = 111;

    $base_image = imagecreatefrompng("../guy.png");
    $top_image = imagecreatefrompng("../frame.png");

    imagesavealpha($top_image, false);
    imagealphablending($top_image, false);
    imagecopy($base_image, $top_image, 0, 0, 0, 0, $width, $height);
    imagepng($base_image, "merged.png");

这篇关于在PHP中合并两个透明图像时的异常结果的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！