ImageManipulator.cs

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//Source:
//http://drwpf.com/blog/2007/09/08/image-manipulation-using-wpf-imaging-classes/

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.IO;
// 下载于www.51aspx.com
namespace DrWPF.Media.Imaging
{
    public class ImageManipulator
    {
        public static void ResizeImage(string filename, int width, int height)
        {
            string extension = Path.GetExtension(filename);
            string rootFilename = Path.GetDirectoryName(filename)
                + @"\" + Path.GetFileNameWithoutExtension(filename);

            // load the file data
            byte[] imageBytes = LoadImageData(filename);

            // decode the image to the requested width and height
            BitmapSource imageSource = CreateImage(imageBytes, width, height);

            // encode the image using the original format
            byte[] encodedBytes = GetEncodedImageData(imageSource, extension);

            // save the modified image
            //filename = rootFilename;// +"Resized" + extension;
            SaveImageData(encodedBytes, filename);

            Console.WriteLine("Resized image to {0} x {1} and saved as {2}.\n", 
                imageSource.PixelWidth, imageSource.PixelHeight, filename);
        }

        public static void CropImage(string filename)
        {
            string extension = Path.GetExtension(filename);
            string rootFilename = Path.GetDirectoryName(filename)
                + @"\" + Path.GetFileNameWithoutExtension(filename);

            // load the file data
            byte[] imageBytes = LoadImageData(filename);

            // decode the image to its natural size
            BitmapSource imageSource = CreateImage(imageBytes, 0, 0);

            // crop the image so that it is square
            bool isPortrait = imageSource.Height > imageSource.Width;
            int squareLength = Math.Min(imageSource.PixelWidth, imageSource.PixelHeight);
            imageSource = new CroppedBitmap(imageSource,
                new Int32Rect(isPortrait ? 0 : (int)((imageSource.PixelWidth - squareLength) / 2),
                              isPortrait ? (int)((imageSource.PixelHeight - squareLength) / 2) : 0,
                              squareLength, squareLength));

            // encode the image using the original format
            byte[] encodedBytes = GetEncodedImageData(imageSource, extension);