如何将WriteableBitmap保存为具有透明性的png图像 [英] How do I save WriteableBitmap as png image with transparency

问题描述

我从图像中裁剪出用于化身的圆形区域.我需要获取图像的像素byte []并以base64格式上传到服务器.不幸的是，方法SaveJpeg()不支持所选圆之外的透明度像素.我尝试了ImageTools库，但是除Windows Phone之外，没有其他平台无法从生成的byte []中创建png图像.有办法吗?

I crop the circular area from the image for the avatar. I need to get pixels byte[] of the image and upload to the server in base64 format. Unfortunately method SaveJpeg() does not support transparency pixels outside the selected circle. I tried ImageTools library, but no other platform except WindowsPhone unable to create png image from the resulting byte[]. Is there a way to do this?

推荐答案

没有平台API可以执行此操作. ToolStack PNG库提供了一种轻量级的解决方案.

There is no platform API to do this. The ToolStack PNG library presents a lightweight solution.

http://toolstack.com/libraries/pngwriter

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