Blue Hour

What this is about

City work loves it because two light sources briefly match. Window light, neon and street lamps are strong enough to read while the sky still holds detail, so a skyline shows both the building and the air around it. That balance is the reason night scenes are often shot here rather than in full darkness: black sky reads as flat and empty. The window is short, it shifts by minutes each day, and the exposure changes throughout, so cameras roll continuously and someone rides the stop.

A term only helps when everyone on set means the same thing by it — so what follows is how it is used, not a dictionary definition.

What runs differently here

In planning terms, that means:

• The defining difference to golden hour: there the sun is still up, here it has already set and only the sky carries light.
• Blue hour happens twice a day, and the morning version arrives before sunrise in reverse order — dark, blue, then gold.
• Interiors need to be lit up in advance to balance, otherwise windows blow out or rooms go black within a few minutes.

With TillyGen

TillyGen shows the twilight window next to the shooting day, so a blue-hour shot is scheduled and not attempted on instinct.

Change one constraint and the consequences travel through the whole plan: affected shots are flagged, the call sheet is regenerated, and nobody keeps working from yesterday's version.