Yes, in case you want to support any resolution you need to use
UniformToFill.
The differences between Unity and noesisGUI are due to the
bilinear setting you are using in the Unity image importer. With this settings Unity avoids using mipmaps. This way you get sharper images but with the risk of generating aliasing. For example, you can try to reduce the image by a high factor and you will see that the result is not acceptable.
If you activate
trilinear in Unity you will see that the result is similar to noesisGUI default. In this case the aliasing is fought by adding blurriness. For now, we don't have option for chaging this behaviour. We should implement the attached property
RenderOptions.BitmapScalingMode. For example:
<Grid
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" UseLayoutRounding="True"
RenderOptions.BitmapScalingMode="LowQuality"
>
<Grid.Background >
<ImageBrush ImageSource="background.png" Stretch="UniformToFill" AlignmentX="Center" AlignmentY="Center"/>
</Grid.Background>
</Grid>
If this is important to you please, file us a bug to prioritize this task. Although, as said, in this option extra aliasing is generated (note that WPF calls this mode LowQuality)
