Gets or sets a value indicating whether the default backend decodes images at the resolution they are drawn at rather than
their own; true by default, since a viewer's tiles are for display only.
public bool ScaledImageDecode { get; set; }
See ScaledImageDecode: a large photograph shown small is decoded at a power-of-two reduction that keeps ImageSamplesPerPixel samples per device pixel. Applies to the default SoftwareTileBackend; a backend from BackendFactory makes its own choice. Printing and export never use reduced images.