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Geekpedia » C# Code » Resize Image With Aspect Ratio

Resize Image With Aspect Ratio

A C# method that resizes pictures and maintains their aspect ratio, optionally only if a maximum width is exceeded. The method works with both images that have a higher height than width and viceversa.

On Friday, May 2nd 2008 at 11:39 PM

By Andrei Pociu (View Profile)

(Rated 5 with 2 votes)

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public void ResizeImage(string OrigFile, string NewFile, int NewWidth, int MaxHeight, bool ResizeIfWider)
{
        System.Drawing.Image FullSizeImage = System.Drawing.Image.FromFile(OrigFile);
        // Ensure the generated thumbnail is not being used by rotating it 360 degrees
        FullSizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
        FullSizeImage.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone);
 
        if (ResizeIfWider)
        {
                if (FullSizeImage.Width <= NewWidth)
                {
                        NewWidth = FullSizeImage.Width;
                }
        }
 
        int NewHeight = FullSizeImage.Height * NewWidth / FullSizeImage.Width;
        if (NewHeight > MaxHeight) // Height resize if necessary
        {
                NewWidth = FullSizeImage.Width * MaxHeight / FullSizeImage.Height;
                NewHeight = MaxHeight;
        }
 
        // Create the new image with the sizes we've calculated
        System.Drawing.Image NewImage = FullSizeImage.GetThumbnailImage(NewWidth, NewHeight, null, IntPtr.Zero);
        FullSizeImage.Dispose();
        NewImage.Save(NewFile);
}

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Current Comments

by Mike on Thursday, May 22nd 2008 at 05:42 PM

Do it in PHP!

by Stuart on Tuesday, June 24th 2008 at 10:49 AM

Fantastic tutorial!

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