Here's one technique you can try to combine a daylight shot with a nighttime shot. It requires a bit of patience but I think it's well worth the effort.
- Set the camera up and record a series of daytime shots - in this case the Opera House - make the most of the light that's available (pic 1 below).
- Then wait for the ambient light level to drop and the lights to begin. Record several examples of VIVID playing on the buildings (pic 2 blow).
- Process the two RAW files, open in Photoshop Elements.
- Copy and paste the VIVID version into the daylight version
- On the daylight layer, use the Magic Wand tool to select the roof as best as you can. I then use the Quick Mask mode (in Photoshop) and the Selection Brush (Elements). Both lay a red mask on the selection which allows you to paint more into the selection, or erase (remove) over-selected areas- sometimes this mask mode is easier than the magic Wand, especially if the Wand over-selects pixels (see demo video below).