C# 将字节数组转换为 PNG/JPG

Converting a byte array to PNG/JPG

提问by user472875

I am currently working on an application that requires high-performance conversion of an unpadded byte array to either a PNG or JPEG. The image format doesn't matter, just as long as it's fast.

我目前正在开发一个需要将未填充字节数组高性能转换为 PNG 或 JPEG 的应用程序。图像格式无所谓，只要速度快就行。

I have tried the .NET libraries and the performance is very bad. Can anyone recommend a good freeware library for this?

我尝试过 .NET 库，但性能很差。任何人都可以为此推荐一个好的免费软件库吗？

EDIT: the byte[] is an 8bit grayscale bitmap

编辑：字节 [] 是一个 8 位灰度位图

采纳答案by Garrett Vlieger

You should be able to do something like this:

你应该能够做这样的事情：

byte[] bitmap = GetYourImage();

using(Image image = Image.FromStream(new MemoryStream(bitmap)))
{
    image.Save("output.jpg", ImageFormat.Jpeg);  // Or Png
}

Look herefor more info.

看看这里获取更多信息。

Hopefully this helps.

希望这会有所帮助。

回答by ahoffer

I like Imagemagick. http://www.imagemagick.org/script/api.php

我喜欢 Imagemagick。 http://www.imagemagick.org/script/api.php

回答by JayC

There are two problems with this question:

这个问题有两个问题：

Assuming you have a gray scale bitmap, you have two factors to consider:

假设您有一个灰度位图，您需要考虑两个因素：

1. For JPGS... what loss of quality is tolerable?
2. For pngs... what level of compression is tolerable? (Although for most things I've seen, you don't have that much of a choice, so this choice might be negligible.) For anybody thinking this question doesn't make sense: yes, you can change the amount of compression/number of passes attempted to compress; check out either Ifranview or some of it's plugins.

1. 对于 JPGS... 质量损失是可以容忍的？
2. 对于 png... 什么级别的压缩是可以容忍的？（虽然对于我见过的大多数事情，你没有那么多选择，所以这个选择可能可以忽略不计。）对于任何认为这个问题没有意义的人：是的，你可以改变压缩量/尝试压缩的传递次数；查看 Ifranview 或其中的一些插件。

Answer those questions, and then you might be able to find your original answer.

回答这些问题，然后您可能会找到原来的答案。