decrease the number of pixels

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C#

can somebody tells me how to decrease the number of pixels of an image in c#

Posted 12-Feb-12 22:50pm

saifullahiit

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Dinesh Mani 13-Feb-12 5:35am

Please be more clear. Do you wish to crop the image or reduce the DPI? Do you want to do this when uploading the image or displaying it?

2 solutions

Solution 2

Have a look at the Image.GetThumbnailImage Method[^] - it probably provides what you are looking for. Mind you, with that little info, it is difficult to tell! :laugh:

Posted 12-Feb-12 23:07pm

OriginalGriff

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Herman<T>.Instance · Accepted Answer · 2012-02-12T23:04:00

Just have written a method for it!

C#

public  static Image resizeImage(Image imgToResize, Size size)
        {
            int sourceWidth = imgToResize.Width;
            int sourceHeight = imgToResize.Height;

            float nPercent = 0;
            float nPercentW = 0;
            float nPercentH = 0;

            nPercentW = ((float)size.Width / (float)sourceWidth);
            nPercentH = ((float)size.Height / (float)sourceHeight);

            if (nPercentH < nPercentW)
                nPercent = nPercentH;
            else
                nPercent = nPercentW;

            int destWidth = (int)(sourceWidth * nPercent);
            int destHeight = (int)(sourceHeight * nPercent);

            Bitmap b = new Bitmap(destWidth, destHeight);
            Graphics g = Graphics.FromImage((Image)b);
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;

            g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);
            g.Dispose();

            return (Image)b;
        }

example:

C#

Image myNewImage = resizeImage(myImage, New Size(1000, 1000);

You now have an image this has maximum of 1000 pixles on the longest side of the original image.

To safe your image use

C#

myNewImage.Save(NewFileName);