WPF: How to display an image at its original size?
Here is a similar question. Generally setting Stretch="None" is enough.
It is also very important what DPI has the image set in metadata. It took me quite a while before figuring out that if the image's DPI is different from the monitor's DPI (usually 96), WPF will automatically resize the image, as it tries to be DPI-independent.
EDIT
The MSDN link is broken, here is the new link:MSDN Blog - Blurry Bitmaps. Let's keep the old link around to be used for archive.org, in case the new link stops working also.
<Image Source="Images/Background.png" UseLayoutRounding="True" SnapsToDevicePixels="True" Width="600" Height="800" Stretch="Fill" />This one works for me, for an image with 600x800 pixels and 96dpi.
@rishad2m8 If size is unknown one can detect the size first with https://msdn.microsoft.com/en-us/library/system.drawing.image.size(v=vs.110).aspx I'd guess.