The current implementations of resizing will always try to resize to the size provided by getEffectiveTargetSize(). For smaller source images, it might be desirable to keep the original source as-is and simply expand the resulting image "canvas" without actually resizing its content.

Added new option for BoundedResize class. To turn on this feature add new property to node /config/modules/imaging/config/thumbnail (portrait or large)/operation/resize - new property expand with value false