C＃调整大小的图像有黑边 [英] C# Resized images have black borders

问题描述

我在.NET中使用的图像缩放的问题。我用的是标准的显卡类型来调整图像一样在这个例子中：

I have a problem with image scaling in .NET. I use the standard Graphics type to resize images like in this example:

public static Image Scale(Image sourceImage, int destWidth, int destHeight)
{
        Bitmap toReturn = new Bitmap(sourceImage, destWidth, destHeight);

        toReturn.SetResolution(sourceImage.HorizontalResolution, sourceImage.VerticalResolution);

        using (Graphics graphics = Graphics.FromImage(toReturn))
        {
            graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
            graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            graphics.DrawImage(sourceImage, 0, 0, destWidth, destHeight);
        }
        return toReturn;
    }

不过，我有一个大问题，调整大小的图像：他们有灰色和黑色的边框，这是非常重要的是要具有图像没有他们

But I have a big problem with resized images: they have gray and black borders and it's extremely important to make have images without them.

为什么他们会出现什么我可以做，使他们消失？

Why do they appear and what I can to do make them disappear?

示例输出：

推荐答案

尝试：

graphic.CompositingMode = CompositingMode.SourceCopy;

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