Pixel size of ImageSource

Question

How can I determine the size of an ImageSource in pixels? The ImageSource object has a Height and a Width property, but they return the size in 1/96 inches..

Answer 1

You have to multiply the value with Windows's DPI resolution in order to obtain the amount of physical pixels. One way to get the DPI resolution is to get hold of a Graphics object and read its DpiX and DpiY properties.

Answer 2

There are 2 types of ImageSource: DrawingImage and BitmapSource.

Obviously, DrawingImage does not have DPI or pixel width, because it's essentially vector graphic.

On other side, BitmapSource has PixeWidth/PixelHeight and also DpiX/DpiY.

http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.bitmapsource.pixelheight.aspx