C# is there a way to minimize a BYTE size of image before sending to server using sokcet

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I've been trying to develop Remote Desktop Program in C# and I want to make the BYTE size of my Image smaller. Here is my attempt below so far.

C#

//
                int w = Screen.PrimaryScreen.Bounds.Width;
                int h = Screen.PrimaryScreen.Bounds.Height;

                //
                Size s = new Size(w, h);

                Bitmap ScreenImage = new Bitmap(w, h);

                Graphics graphics = Graphics.FromImage(ScreenImage);
                graphics.CopyFromScreen(0, 0, 0, 0, s);

                int width = ScreenImage.Width / 2;
                int height = ScreenImage.Height / 2;
                Size resize = new Size(width, height);
                Bitmap resizeImage = new Bitmap(ScreenImage, resize);

                // Bitmap To byte[]
                MemoryStream ms = new MemoryStream();
                resizeImage.Save(ms, ImageFormat.Jpeg);
                ms.Position = 0;
                byte[] data = ms.ToArray();

                byte[] compressedByte = Compress(data);



    public static Byte[] Compress(Byte[] buffer)
    {
        Byte[] compressedByte;
        using (MemoryStream ms = new MemoryStream())
        {
            using (DeflateStream ds = new DeflateStream(ms, CompressionMode.Compress))
            {
                ds.Write(buffer, 0, buffer.Length);
            }

            compressedByte = ms.ToArray();
        }

        return compressedByte;
    }

I tried to make the Bitmap Image resized and compressed to make its BYTE size smaller but I still need to make it smaller. Could anyone give me any other ways? Thank you in advance!

What I have tried:

Bitmap resizeImage = new Bitmap(ScreenImage, resize);
byte[] compressedByte = Compress(data);

Posted 29-May-17 19:54pm

MinYoung Lee

Updated 28-May-19 9:32am

CPallini

v2

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OriginalGriff · Answer 1 · 2017-05-29T20:17:00

Not really: JPEG files are already compressed, and further compression often makes them larger, not smaller. You're already using ZIP compression, but it's unlikely to produce significant gains on a JPEG file anyway. If you get an extra 10% then you were doing well.

But...you do realise that JPEG is a "lossy compression" format? Every time you save a file as JPEG you lose information (and generally get a smaller file) and a more "fuzzy" picture?
I'd suggest that you same it as a loss-less format (BMP (uncompressed, but ZIPs well) or PNG (compressed) for example) and compress that instead.

CPallini · Answer 2 · 2017-05-29T21:05:00

Solution 2

As already noted you usually can't gain much trying to compress a JPEG image, which is alreay compressed. In your code you changed the image size, making it smaller. If it is acceptable to make it even more smaller, then you may save some memory.

Posted 29-May-17 21:05pm

CPallini

Comments

MinYoung Lee 30-May-17 5:46am

Thank you for some help, CPallini!

CPallini 30-May-17 5:49am

You are welcome.

AntonioLeonardo · Answer 3 · 2019-05-28T09:33:00

The imagem compression follow another objects and features that different of trivial files; image compreession has properties to equalize the compression. Like code bellow, the compression act on Quality property:

C#

static byte[] CompressByImageAlg(int jpegQuality, byte[] data)
        {
            using (MemoryStream inputStream = new MemoryStream(data))
            {
                using (Image image = Image.FromStream(inputStream))
                {
                    ImageCodecInfo jpegEncoder = ImageCodecInfo.GetImageDecoders()
                        .First(c => c.FormatID == ImageFormat.Jpeg.Guid);
                    var encoderParameters = new EncoderParameters(1);
                    encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, jpegQuality);
                    byte[] outputBytes = null;
                    using (MemoryStream outputStream = new MemoryStream())
                    {
                        image.Save(outputStream, jpegEncoder, encoderParameters);
                        return outputStream.ToArray();
                    }
                }
            }
        }

C# is there a way to minimize a BYTE size of image before sending to server using sokcet

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