How to change/resizing a large image to small image under WPF without GDI+?

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Hi everybody,

The image is large and loaded it in run-time, actually I want resize selfsame to a small image under WPF facilities without GDI+.
In other words, I have an ImageBrush and set an image large in its ImageSource in run-time, so I want resizing it to small.

Any help pls...

Thanks in advance.

Posted 1-Nov-11 8:10am

hzawary

Updated 1-Nov-11 10:46am

v5

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Espen Harlinn · Answer 1 · 2011-11-01T08:42:00

Solution 1

An image is still an image - so things like
Build an ASP.NET Thumbnail Image Generator[^] provides the code required to create the thumbnail.

And then do something like WPF In-Memory Image Display[^]

You can also use RenderTargetBitmap[^]

public static BitmapSource CreateBitmapSourceFromVisual(double width, double height, Visual visual)
{
    if (visual == null)
    {
        return null;
    }
    RenderTargetBitmap bmp = new RenderTargetBitmap((Int32)Math.Ceiling(width),(Int32)Math.Ceiling(height),300,300,PixelFormats.Pbgra32);
 
    bmp.Render(visual);
    return bmp;
}

Best regards
Espen Harlinn

Posted 1-Nov-11 8:42am

Espen Harlinn

Updated 2-Nov-11 0:34am

v2

Comments

Amir Mahfoozi 1-Nov-11 14:47pm

+5 for providing all required resources

Espen Harlinn 1-Nov-11 14:51pm

Thank you, Amir :)

hzawary 1-Nov-11 14:56pm

Thanks Espen Harlinn for your consideration, actually I want change a large image to small with WPF facilities.

hzawary 2-Nov-11 7:16am

Thanks again Espen, I tried your beautiful code. I want a program like to this

myImageBrush.ImageSource = CreateBitmapSourceFromVisual(100, 100, myImageBrush);

But it has an error. May you more help about this, please?

Espen Harlinn 2-Nov-11 8:57am

System.Windows.Media.Brush is not derived from System.Windows.Media.Visual.
System.Windows.Controls.Image is derived from System.Windows.Media.Visual so if you use an instance of System.Windows.Controls.Image and then call CreateBitmapSourceFromVisual, passing the image and not a brush, you should have something that works.