C# 实现图片压缩工具（基础版）

using System.Drawing;
using System.Drawing.Imaging;
public class ImageCompressor
{
    // 压缩图片（按尺寸缩放+质量调整）
    public static bool CompressImage(string sourcePath, string outputPath, int maxWidth, int maxHeight, long quality = 70)
    {
        try
        {
            using (Image originalImage = Image.FromFile(sourcePath))
            {
                // 计算缩放比例
                float scale = Math.Min((float)maxWidth / originalImage.Width, (float)maxHeight / originalImage.Height);
                int newWidth = (int)(originalImage.Width * scale);
                int newHeight = (int)(originalImage.Height * scale);
                // 创建新位图
                using (Bitmap newBitmap = new Bitmap(newWidth, newHeight))
                using (Graphics g = Graphics.FromImage(newBitmap))
                {
                    g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                    g.DrawImage(originalImage, 0, 0, newWidth, newHeight);
                    // 设置压缩质量
                    EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, quality);
                    ImageCodecInfo jpegCodec = ImageCodecInfo.GetImageDecoders()
                        .First(c => c.FormatID == ImageFormat.Jpeg.Guid);
                    EncoderParameters encoderParams = new EncoderParameters(1);
                    encoderParams.Param[0] = qualityParam;
                    // 保存压缩后的图片
                    newBitmap.Save(outputPath, jpegCodec, encoderParams);
                }
            }
            Console.WriteLine("图片压缩成功！");
            return true;
        }
        catch (Exception ex)
        {
            Console.WriteLine($"压缩失败: {ex.Message}");
            return false;
        }
    }
    // 调用示例
    public static void TestCompress()
    {
        CompressImage("source.jpg", "output_compressed.jpg", 800, 600, 60);
    }
}