Skip to main content

Resizing an Image without losing any quality


public static byte[] CreateThumbnail(byte[] imageBytes, int lnWidth, int lnHeight)
    {
        byte[] b;
        System.Drawing.Bitmap bmpOut = null;

        try
        {
            Bitmap loBMP = new Bitmap(System.Drawing.Image.FromStream(new MemoryStream(imageBytes)));
            ImageFormat loFormat = loBMP.RawFormat;

            decimal lnRatio;
            int lnNewWidth = 0;
            int lnNewHeight = 0;

            if (loBMP.Width < lnWidth && loBMP.Height < lnHeight)
            {
                //NEW.............................................................................................************
                var image = loBMP;
                using (MemoryStream ms = new MemoryStream())
                {
                    image.Save(ms, ImageFormat.Bmp);
                    return ms.ToArray();
                }

                //return loBMP;
            }
            if (loBMP.Width > loBMP.Height)
            {
                lnRatio = (decimal)lnWidth / loBMP.Width;
                lnNewWidth = lnWidth;
                decimal lnTemp = loBMP.Height * lnRatio;
                lnNewHeight = (int)lnTemp;
            }
            else
            {
                lnRatio = (decimal)lnHeight / loBMP.Height;
                lnNewHeight = lnHeight;
                decimal lnTemp = loBMP.Width * lnRatio;
                lnNewWidth = (int)lnTemp;
            }


            bmpOut = new Bitmap(lnWidth, lnHeight);
            Graphics g = Graphics.FromImage(bmpOut);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
            g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
            g.FillRectangle(Brushes.White, 0, 0, lnNewWidth, lnHeight);
            g.DrawImage(loBMP, 0, 0, lnNewWidth, lnHeight);

            loBMP.Dispose();
        }
        catch { return imageBytes; }

        var image2 = bmpOut;
        using (MemoryStream ms = new MemoryStream())
        {
            image2.Save(ms, ImageFormat.Bmp);
            b = ms.ToArray();
        }
        return b;
        //return bmpOut;
    }

Comments

Post a Comment

Popular posts from this blog

ASP.NET MVC - Set custom IIdentity or IPrincipal

Here's how I do it. I decided to use IPrincipal instead of IIdentity because it means I don't have to implement both IIdentity and IPrincipal. Create the interface interface ICustomPrincipal : IPrincipal { int UserId { get ; set ; } string FirstName { get ; set ; } string LastName { get ; set ; } } CustomPrincipal public class CustomPrincipal : ICustomPrincipal { public IIdentity Identity { get ; private set ; } public bool IsInRole ( string role ) { return false ; } public CustomPrincipal ( string email ) { this . Identity = new GenericIdentity ( email ); } public int UserId { get ; set ; } public string FirstName { get ; set ; } public string LastName { get ; set ; } } CustomPrincipalSerializeModel - for serializing custom information into userdata field in FormsAuthenticationTicket object. public class CustomPrincipalSerializeMode...
8 comments
Read more

Validate credit card number with Mod 10 algorithm in C#

Introduction All you know what information contains in your NIC number. But do you know what information contains in the Credit Card Number? Following article provides brief details about what information contain in your credit card and demonstrates to how to validate credit card number using mod 10 (Luhn) algorithms with C#. Background  Card Length   Typically, credit card numbers are all numeric and the length of the credit card number is between 12 digits to 19 digits.  14, 15, 16 digits – Diners Club 15 digits – American Express 13, 16 digits – Visa 16 digits - MasterCard   For more information please refer  http://en.wikipedia.org/wiki/Bank_card_number . Hidden information  Major Industry Identifier (MII)   The first digit of the credit card number is the Major Industry Identifier (MII). It designates the category of the entry which issued the card.     1 and 2 – Airlin...
1 comment
Read more

kendo ui menu dynamic - ASP.NET MVC

Model Class public class DynamicMenu {     public int MenuID { get; set; }     public string MenuName { get; set; }     public int ParentMenuID { get; set; } } Controller Code public ActionResult Menu() {      ViewData["DynamicMenu"] = new List<DynamicMenu> {             new DynamicMenu{ MenuID = 1, MenuName = "Self", ParentMenuID = 0 },             new DynamicMenu{ MenuID = 2, MenuName = "Functional", ParentMenuID = 0  },             new DynamicMenu{ MenuID = 3, MenuName = "Leave", ParentMenuID = 1 },             new DynamicMenu{ MenuID = 4, MenuName = "Leave Application", ParentMenuID = 3 },             new Dynamic...
1 comment
Read more