WPF Image become black at specific height value

Question

I've a Image control inside a ScrollViewer and TIFF file set as its source. Image displayed with black overlay for some height values (in range of 40% to 60% of image's actual height). I find it only when Stretch value is set to anything other than "None".

<ScrollViewer Grid.Column="2" Margin="5" HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible">
    <Image Source="doc.tif" Grid.Row="0" Height="3510" Stretch="Uniform" StretchDirection="Both"/>
</ScrollViewer>

Screenshot: actual image is white in background with black text.