Why Combining Two Images to Make One is Sometimes Better Than Simply Shooting One Image

Sometimes I over-think things. I tend to get caught up in details of how and why something is the way it is. I've even been told, subtly mind you, that I over-complicate things and sometimes create a cluttered view of what I am talking about as a result. I know this to be true and do take it to heart, no really I do, but I just can't help myself when it comes to something where there is a revelation of sorts that seems to jump out at me. Take for instance the subject of this article. Based on the title you might be thinking, well, there he goes again. You'd probably be right, but hear me out, because I do believe this actually makes sense.

So, why is combining two images to make one, sometimes better than simply shooting one image to start with? Well, let me explain. First of all, this idea does not always apply to every situation.  In most cases a single, well-lit photo of a subject is more than adequate to create an appealing image. However there are circumstances where capturing two or more images, then combining them into one will create a more powerful looking image.

Let's take the picture above of an F-4 Phantom aircraft as an example. In recent weeks I have been concentrating on this particular shoot for several reasons and have included commentary in several blog posts about it. The more I began to study the outcome of this image, the more I began to realize  the final result could not have been made without the combining of two separate images. Had I used lets say six or seven flash units all at once, I potentially could have captured this image in a single shot. However, it would never have looked the same and might have even been inferior to the final image created using four speedlights and two combined images.

The reason is this. Had I used six or seven flash units at the same time, they would have been working against each other. Part of the appeal of this image is the dramatic use of light (red light in this case) bounced off the tarmac and then reflected back into the underside of the aircraft. Two other lights were used to illuminate the outside edges. This combination created the first image. Take notice how the light and shadows along with the reflections created a strong dramatic appearance.

After re-positioning the lights, a second image was created by pointing two lights toward the canopy and filling the front, top, and underside of the aircraft with ordinary white light. This flood of white light bouncing off the tarmac is what would create the problem if they were used at the same time as the wing positioned red lights.

In the final results, the second image was layered on top of the first image. The dramatic red light was then revealed by erasing portions of the top layer and leaving the  top half of the layer alone. Had I used six flash units at the same time, the additional two units pointing toward the canopy would have diluted and washed out the red light and shadows coming from behind the wings. The dramatic red light would no longer have been there, at least not at the same intensity levels. Also, most if not all of the Vanishing Point depth and dimension created by the shadows would have been lost.

By combining two separate exposures, the lighting effects of each individual exposure were fully realized without interfering with each other.

The image above is a sample of a similar aircraft that was captured in a single shot using seven flash units at the same time. Notice how the white lights seem to have washed out the power and strength of the red gelled lights. It's a nice photo, but without the drama that could have been, had we used two separate shots. Not every situation lends itself well to this technique, but, sometimes thinking through a problem and observing the results, however unexpected, can often reveal an exciting outcome.

So...maybe I do over-think problems a bit too much. I suppose it is a bi-product of 30 years of mainframe computer programming where that is what you do...everyday. Building a final image from multiple shots is not a new idea, but combining multiple images with creative lighting just might offer a way to experience the power and versatility of speedlights in a unique way. It sort of occurred to me just how much merit this concept really does warrant.