Today’s Post by Joe Farace
Just as pianists have to practice their scales, I think photographers should practice exposure. I believe that obtaining correct exposure is a critical step in maximizing image quality and it’s seems even more so for digital capture than when shooting film.
Exposure latitude—the ability to over or underexpose a captured image—is greater with color negative film than for any other type of media. Slide film, on the other hand, has the least amount of latitude, especially on the overexposure side, which quickly blows out all highlight detail. Digital camera sensors seem to respond like a hybrid of those different kinds of color films. In digital capture, there’s little latitude on the overexposure side because any image data is literally wiped out but underexposure has lots of latitude, almost as much as film. If you have time, take a look at my post on rescuing underexposed images. The downside of underexposed images is an increase in noise, although software such as Define can help mitigate that somewhat, depending on the amount of noise.
Because the LCD preview screen on most digital cameras can sometimes exaggerate an image’s contrast or, depending on camera model, even exposure it’s easy to get what you think is a well-exposed image but in reality is slightly underexposed.
In the best of all possible worlds, I start by making an exposure and after evaluating its histogram adjust the camera’s exposure compensation control accordingly. But there are many, many situations when you just don’t have time to do this. When that happens, I do what photographers have done since film days—bracket. I also shoot RAW more often than in the past, because it give you even more wiggle room.
In tricky lighting situations, sometimes the best solution is to bracket by shooting a three-or-five shot series varying exposures from what would be considered underexposure to overexposure. Most cameras these days offer an automatic bracket option as seen above on a Lumix mirrorless camera.
Only the image’s histogram reveals the truth. Practice bracketing and gradually you will learn how to evaluate the image on your LCD screen and make exposure adjustments without having to look at the histogram. And don’t forget, most cameras have a menu item that let you adjust screen brightness. Use your experience to adjust that setting to have it represent reality.
The top photograph (not the bracket) is from my self-published book, “Acapulco, Paradise of the Americas,” that was co-authored with Don Bain, and is available on Blurb.com.