如何调整图像大小并保存在文件夹中?

问题描述：

我尝试过:

string str = System.IO.Path.GetFileName(txtImage.Text);
string pth = System.IO.Directory.GetCurrentDirectory() + "\\Subject";
string fullpath = pth + "\\" + str;

Image NewImage = clsImage.ResizeImage(fullpath, 130, 140, true);
NewImage.Save(fullpath, ImageFormat.Jpeg);

public static Image ResizeImage(string file, int width, int height, bool onlyResizeIfWider)
{
    if (File.Exists(file) == false)
        return null;
    try
    {
        using (Image image = Image.FromFile(file))
        {
            // Prevent using images internal thumbnail
            image.RotateFlip(RotateFlipType.Rotate180FlipNone);
            image.RotateFlip(RotateFlipType.Rotate180FlipNone);
            if (onlyResizeIfWider == true)
            {
                if (image.Width <= width)
                {
                    width = image.Width;
                }
            }
            int newHeight = image.Height * width / image.Width;
            if (newHeight > height)
            {
                // Resize with height instead
                width = image.Width * height / image.Height;
                newHeight = height;
            }
            Image NewImage = image.GetThumbnailImage(width, newHeight, null, IntPtr.Zero);
            return NewImage;
        }
    }
    catch (Exception )
    {
        return null;
    }
}

运行上面的代码，我得到的图像大小为4-5 KB，图像质量非常差. 原始图像文件的大小不得超过1.5 MB.如何改善结果的图像质量?

Running the above code, I get an image 4-5 KB in size with very poor image quality. The original image file is no more than 1.5 MB large. How can I improve the image quality of the results?

答

我认为您应该使用图像缩放器，免费并且调整图像大小非常容易.

I think you should use Image Resizer, its free and resizing an image is very easy using it.

var settings = new ResizeSettings {
MaxWidth = thumbnailSize,
MaxHeight = thumbnailSize,
Format = "jpg"
};
settings.Add("quality", quality.ToString());
ImageBuilder.Current.Build(inStream, outStream, settings);
resized = outStream.ToArray();

您还可以使用Nuget软件包管理器进行安装.

You can also install it using Nuget package manager.

PM> Install-Package ImageResizer

如何调整图像大小并保存在文件夹中?

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