Comments on: Image Resizing in C#

By: George

George — Thu, 21 Apr 2011 10:52:24 +0000

System.Drawing.Image test_image = System.Drawing.Image.FromFile(Server.MapPath(“images.jpg”));
System.Drawing.Image final_image = test_image.Resize(500, 500);
final_image.Save(Server.MapPath(“images/resized_image.jpg”));

By: George

George — Thu, 21 Apr 2011 10:50:51 +0000

@Tony Brand

System.Drawing.Image test_image = System.Drawing.Image.FromFile(Server.MapPath(“images.jpg”));

System.Drawing.Image final_image = test_image.Resize(500, 500);

final_image.Save(Server.MapPath(“images/resized_image.jpg”));

By: George

George — Thu, 21 Apr 2011 10:50:31 +0000

System.Drawing.Image test_image = System.Drawing.Image.FromFile(Server.MapPath(“images.jpg”));

System.Drawing.Image final_image = test_image.Resize(500, 500);

final_image.Save(Server.MapPath(“images/resized_image.jpg”));

By: George

George — Thu, 21 Apr 2011 10:25:52 +0000

@Matjaz: hi frnd, Change Int64 to System.Int64

By: Xander

Xander — Tue, 11 May 2010 18:10:43 +0000

@Matjaz The Quality category specifies the level of compression for an image. When used to construct an EncoderParameter, the range of useful values for the quality category is from 0 to 100. The lower the number specified, the higher the compression and therefore the lower the quality of the image. Zero would give you the lowest quality image and 100 the highest. MSDN - Encoder.Quality

By: Matjaz

Matjaz — Tue, 11 May 2010 11:27:40 +0000

Thanks, i spent a lot of time searching for some good code to do image resize.

I have only one question:
What is Int64 Quality attribute for saving images. Which value should i set for this parameter?

By: Tyson

Tyson — Mon, 03 May 2010 02:01:12 +0000

Thank you, excellent

By: Radderz

Radderz — Tue, 02 Feb 2010 13:48:43 +0000

This extender is really useful, thanks.

I’ve been struggling with resizing and maintaining the image quality while using the .net framework, and nearly resorted to a library that was a bit overkill.

Glad I found this in time

By: jo0ls

jo0ls — Fri, 09 Oct 2009 09:25:28 +0000

Encoder.Quality doesn’t do anything with Gifs.

By: Tony Brand

Tony Brand — Wed, 19 Aug 2009 15:50:52 +0000

Thanks for the example. I just wanted to get the image resizing working, and wrote the following function after seeing your code:

public System.Drawing.Image ResizeImage(System.Drawing.Image originalImage, int Width, int Height, InterpolationMode InterpolationMode)
{
System.Drawing.Image CropedImage = new Bitmap(Width, Height);
using (Graphics G = Graphics.FromImage(CropedImage))
{
G.SmoothingMode = SmoothingMode.HighQuality;
G.InterpolationMode = InterpolationMode;
G.PixelOffsetMode = PixelOffsetMode.HighQuality;
G.DrawImage(originalImage, 0, 0, Width, Height);
}

return CropedImage;
}

I then save the returned image, e.g.: ResizeImage(image).Save(“C:/Documents/Images/ResizedImage.jpg”);

I am finding though that the saved image is somehow not valid, it does not open in Internet Explorer, or Fireworks (get error message: “Could not open the file. Unknown file type”), although it does open and looks fine in FireFox and Safari.

I have had the same problem trying a number of examples using the Graphics.DrawImage() method. Do you know anything about this problem? Perhaps there are some extra settings that need to be made?

Thanks again, any help would be appreciated