Changing the DPI of a C#image

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Personal I am developing an app in WPF and at a certain point I need to convert the DPI of an image, as I do?

I’m using the class System.Windows.Media.Imaging.BitmapImage

And to load the image I use the following code:

var fileUri = new Uri(openDlg.FileName);
var bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.CacheOption = BitmapCacheOption.None;
bitmap.UriSource = fileUri;
bitmap.EndInit();

One option would be to make the resize calculation that way:

double resizeFactor = 96 / currentDpi;
int width = Convert.ToInt32(bitmap.PixelWidth * resizeFactor);
int height = Convert.ToInt32(bitmap.PixelHeight * resizeFactor);

It works, but it’s not working =/

If you know a library tbm help :D

image wpf dpi

  • What’s the problem after all? You don’t know how to use width and height to change the IPR?

  • In the end I have images in 3 resolutions (DPI), 72, 96 and 120... I need to turn them all to 96, regardless if I increase the width and height

  • It worked, I used the framework Emgu CV, as I would already use it to make equalization of the histogram ended up using the resize of it

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