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Java ImageIO：我可以将PNG-24文件转换为PNG-8吗？

[英]Java ImageIO: Can I convert a PNG-24 file to PNG-8?

原文 2010-01-17 16:50:34 4 2 java/ png/ javax.imageio/ png-24/ iepngfix

The scenario is this: Users of the webapp can customize the website by choosing their own logo image, background colors and background images. 场景是这样的：webapp的用户可以通过选择他们自己的徽标图像，背景颜色和背景图像来自定义网站。

Problem is that IE6 does not support transparent PNG. 问题是IE6不支持透明PNG。 I've tried several client-side solutions, but all fall short on one aspect or the other (most don't support the css property background-repeat ). 我已经尝试了几种客户端解决方案，但是在一方面或另一方面都不尽如人意（大多数都不支持css属性background-repeat ）。

I'm looking for the alternate solution of creating two separate images on the server, one for modern, transparent-png-compliant browsers and one for IE6. 我正在寻找在服务器上创建两个单独图像的替代解决方案，一个用于现代，透明-png兼容的浏览器，另一个用于IE6。

Question is, can I accomplish this with ImageIO ? 问题是，我可以用ImageIO来完成吗？ Basically, I would detect whether the image is in PNG-24 format and convert it to PNG-8 (which is supported on IE6). 基本上，我会检测图像是否是PNG-24格式并将其转换为PNG-8（IE6支持）。

2 个解决方案

If you need transparency in IE6, then consider simply shipping a GIF instead for that browser. 如果你在IE6中需要透明度，那么考虑只为该浏览器发送GIF。 Would that be feasible? 那可行吗？

I know you said you used various client-side solutions, but this one worked in the project I was using, so just in case : http://jquery.andreaseberhard.de/pngFix/ 我知道你说你使用过各种客户端解决方案，但是这个解决方案在我正在使用的项目中工作，所以以防万一： http ： //jquery.andreaseberhard.de/pngFix/

(if you already tried it, feel free to comment, I'll delete the answer) （如果您已经尝试过，请随意发表评论，我会删除答案）