OK, so this is probably more of a "Photography 201" topic but lets talk off camera flash and layering/stacking images for a sec...
As a budget-conscious photographer, I don't have a lot of money to spend on lighting equipment. I have two flashes (and never enough batteries) and some flood lights I could use in a pinch, but that's it. To compensate for my lack of gear, I've taught myself how to use my flash off camera and stack images to get the desired effect of having multiple flashes.
So, for the following technique, here's what you'll need:
- a subject
- a camera
- at least one flash or source of light
- a tripod
If it's too dark to use available light or you just want to highlight specific areas of your subject, this is a great way to create pretty amazing images.
For example, the other day I was shooting a BMW 1M Coupe in a studio. The owner of the studio had decided to change out the lighting and hadn't finished setting up the new system when I had to shoot the car. Without very good lighting, I had to use my only flash with charged batteries.
So, I set up the car, positioned my camera where I wanted it on my tripod and set it to a timed release. I used the timer to avoid any possible vibrations from pressing the shutter button. I used the on-camera flash on my Nikon D700 to trigger my SB-700 flash that I set up in multiple positions around the room. Here's the first example:
Flash aimed at the front of the car:
Flash aimed at the front wheel:
Flash aimed at the rear wheel:
All of the shots I posted above stemmed from JPEGs taken straight out of the camera with no post-processing. After taking these three shots, I imported them into Photoshop CS5. I picked one image to be the base and proceeded to copy and paste the other two images on top of it as layers. I then played with the transparency of each layer to see where the car would be lit up and used the eraser tool to delete bits of each layer until the image looked like this:
The only tweaks made to the above photo aside from the layering was to use the Content-Aware Clone Tool to remove the lines from the flooring and turn-table, as well as the line where the floor hits the wall and some electrical sockets that bothered me. I also cleaned up some of the shadows on the wall from using the flash in different locations. Once everything was cleaned up, I used the Magnetic Lasso to select just the headlights and lowered some of the highlights. I also desaturated the background.