缩小图像大小 [英] Reduce image size imagemagic

问题描述

我尝试压缩图像，但是没有成功.

I have tried to compress image but has no success.

看看我的小实验

            var results = new Dictionary<int, int>();
            for (int i = 0; i <= 100; i++)
            {
                var stream = new MemoryStream();
                image.Quality = i;
                image.CompressionMethod = CompressionMethod.Zip;
                image.Write(stream, MagickFormat.Png);
                results[i] = stream.GetBuffer().Length;
                stream.Flush();
            }

            var best = results.OrderBy(e => e.Value).First(); 
           // the same length as for original image. quality doesn't work in this example - dictionary values are identical

有人能指出我正确的方向吗?

Could any one point me to right direction?

我已经在这里阅读过一些详细信息 ImageMagick:PNG的无损最大压缩吗?

I have already read some details here ImageMagick: Lossless max compression for PNG?

推荐答案

似乎您正在使用 Magick.NET .该库有一个称为ImageOptimizer的类，可用于无损压缩文件.有关如何使用它的示例，可以在这里找到: https ://github.com/dlemstra/Magick.NET/blob/master/Documentation/LosslessCompression.md .

It seems that you are using Magick.NET. That library has a class called ImageOptimizer that can be used to lossless compress the file. An example on how you could use that can be found here: https://github.com/dlemstra/Magick.NET/blob/master/Documentation/LosslessCompression.md.

FileInfo snakewareLogo = new FileInfo(@"c:\Snakeware.png");

Console.WriteLine("Bytes before: " + snakewareLogo.Length);

ImageOptimizer optimizer = new ImageOptimizer();
optimizer.LosslessCompress(snakewareLogo);

snakewareLogo.Refresh();
Console.WriteLine("Bytes after:  " + snakewareLogo.Length);

由于文件已经以最佳压缩率存储，因此仍然有可能无法减小文件的大小.

It is still possible that your file cannot be reduced in size because it is already stored with the best compression.

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