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Monday, 21 December 2015

Create thumbnail in ASP.NET

You can resize image this with no effect on the picture quality and you can save it in any format such as .jpeg, .png , .bmp and .gif etc. You can use this code any where in asp.net.


public System.Drawing.Image GenerateThumnail(System.Drawing.Image imgPhoto, int Width, int Height)
    {
        int sourceWidth = int.Parse(imgPhoto.Width.ToString());
        int sourceHeight = int.Parse(imgPhoto.Height.ToString());
        int sourceX = 0;
        int sourceY = 0;
        int destX = 0;
        int destY = 0;
 
        float nPercent = 0;
        float nPercentW = 0;
        float nPercentH = 0;
 
        nPercentW = ((float)Width / (float)sourceWidth);
        nPercentH = ((float)Height / (float)sourceHeight);
        if (nPercentH < nPercentW)
        {
            nPercent = nPercentH;
            destX = System.Convert.ToInt16((Width -
                          (sourceWidth * nPercent)) / 2);
        }
        else
        {
            nPercent = nPercentW;
            destY = System.Convert.ToInt16((Height -
                          (sourceHeight * nPercent)) / 2);
        }
 
        int destWidth = (int)(sourceWidth * nPercent);
        int destHeight = (int)(sourceHeight * nPercent);
 
        Bitmap bmPhoto = new Bitmap(Width, Height,
                          PixelFormat.Format24bppRgb);
        bmPhoto.SetResolution(imgPhoto.HorizontalResolution,
                         imgPhoto.VerticalResolution);
        bmPhoto.MakeTransparent();
 
        Graphics grPhoto = Graphics.FromImage(bmPhoto);
        grPhoto.Clear(Color.Transparent);
        grPhoto.InterpolationMode =
                InterpolationMode.HighQualityBicubic;
 
        grPhoto.DrawImage(imgPhoto,
            new Rectangle(destX, destY, destWidth, destHeight),
            new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight),
            GraphicsUnit.Pixel);
 
        grPhoto.Dispose();
        return bmPhoto;
    }

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