Compress Image - CSharp System.Drawing.Imaging

CSharp examples for System.Drawing.Imaging:Bitmap

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Description

Compress Image

Demo Code


using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing;
using System.IO;/*from  w w w .j  ava  2s  . c  om*/
using System.Collections;
using System;

public class Main{

        public static void Compress(string srcFile, string destFile, long level)
        {
            // Create a Bitmap object based on a BMP file.
            Bitmap bm = new Bitmap(srcFile);
            Compress(bm, destFile, level);
            bm.Dispose();
        }
        public static void Compress(Image srcImg, string destFile, long level)
        {
            Bitmap bm = new Bitmap(srcImg);
            Compress(bm, destFile, level);
            bm.Dispose();
        }
        public static void Compress(Stream srcStream, string destFile, long level)
        {
            Bitmap bm = new Bitmap(srcStream);
            Compress(bm, destFile, level);
            bm.Dispose();
        }
        public static void Compress(Bitmap srcBitMap, string destFile, long level)
        {
            Stream s = new FileStream(destFile, FileMode.Create);
            Compress(srcBitMap, s, level);
            s.Close();
        }
        public static void Compress(Bitmap srcBitmap, Stream destStream, long level)
        {
            ImageCodecInfo myImageCodecInfo;
            Encoder myEncoder;
            EncoderParameter myEncoderParameter;
            EncoderParameters myEncoderParameters;
            myImageCodecInfo = GetEncoderInfo("image/jpeg");
            myEncoder = Encoder.Quality;
            myEncoderParameters = new EncoderParameters(1);
            myEncoderParameter = new EncoderParameter(myEncoder, level);
            myEncoderParameters.Param[0] = myEncoderParameter;
            srcBitmap.Save(destStream, myImageCodecInfo, myEncoderParameters);
        }
        public bool Compress(string oldfile, string newfile)
        {
            try
            {
                Image img = Image.FromFile(oldfile);
                ImageFormat thisFormat = img.RawFormat;
                Size newSize = new Size(100, 125);
                Bitmap outBmp = new Bitmap(newSize.Width, newSize.Height);
                Graphics g = Graphics.FromImage(outBmp);
                g.CompositingQuality = CompositingQuality.HighQuality;
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(img, new Rectangle(0, 0, newSize.Width, newSize.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
                g.Dispose();
                EncoderParameters encoderParams = new EncoderParameters();
                long[] quality = new long[1];
                quality[0] = 100;
                EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
                encoderParams.Param[0] = encoderParam;
                ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo jpegICI = null;
                for (int x = 0; x < arrayICI.Length; x++)
                    if (arrayICI[x].FormatDescription.Equals("JPEG"))
                    {
                        jpegICI = arrayICI[x]; 
                        break;
                    }
                img.Dispose();
                if (jpegICI != null) outBmp.Save(newfile, System.Drawing.Imaging.ImageFormat.Jpeg);
                outBmp.Dispose();
                return true;
            }
            catch
            {
                return false;
            }
        }
}

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