How to compress jpg image?

Question

I have a 3300K jpg image format.

I am trying to compress the image =>, so I resized the image, but still I have a very large file size (~ 800K)

Resize Method Code:

internal static Image resizeImage( Image imgToResize ) { Bitmap b = new Bitmap( 300, 300 ); using( Graphics g = Graphics.FromImage( ( Image )b ) ) { //g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.InterpolationMode = InterpolationMode.Low; g.DrawImage( imgToResize, 0, 0, 300, 300 ); imgToResize.Dispose(); } return ( Image )b; } 

I have to compress the image - even if the image quality is less than the original.

How can i do this?

Answer 1

mg = image

newsize = height and width

Call the Resize function using the following code

 Bitmap mg = new Bitmap(strUploadPath); Size newSize = new Size(Convert.ToInt32(DispMaxWidth), Convert.ToInt32(DispMaxHeight)); Bitmap bp = ResizeImage(mg, newSize); if (bp != null) bp.Save(strUploadPath, System.Drawing.Imaging.ImageFormat.Jpeg); private Bitmap ResizeImage(Bitmap mg, Size newSize) { double ratio = 0d; double myThumbWidth = 0d; double myThumbHeight = 0d; int x = 0; int y = 0; Bitmap bp; if ((mg.Width / Convert.ToDouble(newSize.Width)) > (mg.Height / Convert.ToDouble(newSize.Height))) ratio = Convert.ToDouble(mg.Width) / Convert.ToDouble(newSize.Width); else ratio = Convert.ToDouble(mg.Height) / Convert.ToDouble(newSize.Height); myThumbHeight = Math.Ceiling(mg.Height / ratio); myThumbWidth = Math.Ceiling(mg.Width / ratio); //Size thumbSize = new Size((int)myThumbWidth, (int)myThumbHeight); Size thumbSize = new Size((int)newSize.Width, (int)newSize.Height); bp = new Bitmap(newSize.Width, newSize.Height); x = (newSize.Width - thumbSize.Width) / 2; y = (newSize.Height - thumbSize.Height); // Had to add System.Drawing class in front of Graphics --- System.Drawing.Graphics g = Graphics.FromImage(bp); g.SmoothingMode = SmoothingMode.HighQuality; g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.PixelOffsetMode = PixelOffsetMode.HighQuality; Rectangle rect = new Rectangle(x, y, thumbSize.Width, thumbSize.Height); g.DrawImage(mg, rect, 0, 0, mg.Width, mg.Height, GraphicsUnit.Pixel); return bp; } 

Answer 2

JPG images are already compressed.

You can try to reduce the size of the image using a different image compression compression algorithm.

In this case, try setting CompositingQuality or SmoothingMode for better (for you) values ​​- maybe there are other properties that may help.