A style of photography designed to reflect the dramatic, low-key lighting of Hollywood noir films. It can be achieved with lighting or, increasingly, with digital image effects which convert images to black and white, exaggerate contrast and often add grain and a vignette.
Taking two shots on a single frame. In the days of film this meant locking the film advance when cocking the shutter and taking another picture on a frame of film that’s already been exposed. On a digital camera, the camera stores the first image in its memory and then merges it with the second.
It’s possible to simulate the appearance of moonlight quite effectively using a daytime sunlit shot, darkening it, reducing the saturation and shifting the white balance towards to blue end of the spectrum. A graduated filter is often useful for darkening the sky.
Two or more images combined, usually using layers in a program like Photoshop or Affinity Photo.
It’s possible to simulate this digitally using a combination of exposure and glow effects. The Nik Color Efex Pro plug in offers a graduated mist filter that increases the mist effect towards the top of the photo and more distant objects.