图像大小调整在.NET中使用抗锯齿 [英] Image resizing in .Net with Antialiasing

问题描述

我有一些C＃code需要改变，我认为是pretty的典型形象：

I've got some C# code that resizes images that I think is pretty typical:

Bitmap bmp = new Bitmap(image, new Size(width, height));
Graphics graphics = Graphics.FromImage(bmp);
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.SmoothingMode = SmoothingMode.AntiAlias;
graphics.DrawImage(bmp, width, height);

的问题是，所得到的图像被明显地别名和更改InterpolationMode和Smoothi​​ngMode性质似乎没有什么区别。

The problem is that the resultant images are clearly aliased and changes to the InterpolationMode and SmoothingMode properties seem to make no difference.

任何指针？

推荐答案

原来的code是不对的。它实际上调整图像大小，而不插在位图的构造函数，然后尝试顺利调整的版本已经是在大小。这是修订后的code：

It turns the code was just wrong. It was actually resizing the image without interpolation in the Bitmap constructor, and then attempting to smoothly resize that version to the size it was already at. Here is the amended code:

Bitmap bmp = new Bitmap(width, height);
Graphics graph = Graphics.FromImage(bmp);
graph.InterpolationMode = InterpolationMode.High;
graph.CompositingQuality = CompositingQuality.HighQuality;
graph.SmoothingMode = SmoothingMode.AntiAlias;
graph.DrawImage(image, new Rectangle(0, 0, width, height));

据抗锯齿去，最重要的参数是 graph.InterpolationMode 。

感谢。

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