Resize Image - A better way

# re: Resize Image - A better way

Hi Mital,

Thanks for the code snippet, I have a project on the back burner where I will need to generate thumbnails so this code should help to put me on the right track. Thanks again! 6/11/2005 3:30 AM | Peter Stathakos

# But, why are the image files so large ?!

Hi Mital,
great bit of code, works like a charm, but... why are the generated thumbnails sometimes several times larger than the original file !
One of the reasons for generating thumbnails was to save disc space, but none of the ASP.NET (VB) solutions I've found helped.
I've actually resorted to using a Persits component to do the resize once I've uploaded the original image !
Is it an ASP.NET / GDI+ issue, or am I missing something *really* obvious !
email: Name (from above) at gmail dot com 7/11/2005 2:36 PM | OffBeatMammal

# re: Resize Image - A better way

Great!!! Works perfectly!! 8/12/2005 11:23 AM | Nirondes

# re: Resize Image - A better way

Nice code.. I have some weeks trying to do that.. thank you! 10/11/2005 3:27 AM | Roly

# re: Resize Image - A better way

Excelente código, habia revisado otros codigos pero este es el mejor que he encotnrado, Gracias!! 8/5/2006 1:10 AM | armadillo

# re: Resize Image - A better way

Thanks very much, i got the solution with this peace of code.. 5/18/2008 5:13 PM | pavan

# re: Resize Image - A better way

Thanks for this. Here it is translated into C#:

[code]
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

namespace Viz
{
public static class Utilities
{
static readonly PixelFormat[] BadFormats = new PixelFormat[]
{
PixelFormat.Format1bppIndexed ,
PixelFormat.Format4bppIndexed ,
PixelFormat.Format8bppIndexed ,
PixelFormat.Undefined ,
PixelFormat.DontCare ,
PixelFormat.Format16bppArgb1555 ,
PixelFormat.Format16bppGrayScale
};

public static Bitmap Resize(Image src, int height, int width)
{
var b = new Bitmap(width, height, src.PixelFormat);

if (Array.Exists(BadFormats, pf => pf == b.PixelFormat))
throw new NotSupportedException("Pixel format of the image is not supported: "
+ "See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/"
+ "cpref/html/frlrfSystemDrawingGraphicsClassFromImageTopic.asp");

var graphicsImage = System.Drawing.Graphics.FromImage(b);
graphicsImage.SmoothingMode = SmoothingMode.HighQuality;
graphicsImage.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphicsImage.DrawImage(src, 0, 0, b.Width, b.Height);
graphicsImage.Dispose();
return b;
}
}
}
[/code] 4/10/2009 9:59 AM | Gabe