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Tuesday, February 28, 2012

Digital Quick tips


OP Contributing Editor Jon Cornforth shares simple, but powerful steps to get your shots into top shape

This Article Features Photo Zoom


Every new digital photographer struggles with how to process images. I know from my own experience how difficult it can be. When I started scanning my color transparencies and working with Photoshop 11 years ago, there were almost no books available about digital imaging, let alone online tutorials or workshops like there are today. I had to teach myself. Then, along came digital photography with its steep learning curve, but fortunately, I already had a solid understanding of how to work with color.

Here, I'll share my techniques that show how simple it can be to process digital images. There are many different digital workflow philosophies and personal tastes about how an image should look. In this article, the point is not to discuss every possible method, but to make digital photography less intimidating. I hope this will serve as a starting point for many years of your creative growth.

Lens Correction
1 Lens anomalies like barrel distortion, chromatic aberration and vignetting can have a profound effect on your images. These are typically encountered when using wide-angle lenses. Barrel distortion can make ocean horizons unnaturally curve, and chromatic aberration yields fringes of color along dark and bright edges. Most image-editing programs have built-in lens profiles that you can select for a specific lens' correction, as well as adjustment tools that you can set yourself. If you play around with these adjustments, you'll begin to notice a pattern of what settings to use for a specific lens.

Adjusting Contrast With The Black And White Points
2 The first thing that most new photographers will notice is that their photos appear rather flat and lifeless. A digital image file is only data, and it needs to be developed to reach its potential. The best place to get started is to set a black and a white point on the histogram. To begin, locate the Levels adjustment in your processing software. You'll see a graph containing data that goes from left to right, representing black at 0 and white at 255. This is the histogram. Most properly exposed images will have a histogram containing data that falls somewhere in the middle of the graph. The arrows located beneath the histogram are what you'll adjust. By simply sliding the black point to the right and the white point to the left, you'll add more contrast.

Almost immediately you should see a livelier image. Don't be afraid of having some dark shadows or blown-out highlights. You can turn on the shadow and highlight alert in your editing program to help you judge the intensity of your adjustments. There are no hard rules about how much is too much or not enough. Take a look at the work of photographers who inspire you, and you'll begin to get a feel for how you want your images to look.

Curves
3 Using Curves adjustments often can be intimidating, but there's no need to be afraid of playing with the overall or individual color curves, especially if you've already set good black and white points. If you click on the lower-left edge of the overall luminosity curve, you'll see that you can drag the curve to expand or contract the shadows. The same thing applies to the highlights if you drag somewhere in the upper right. One of the most common Curves adjustments is a contrast curve where you slightly drag down the darks and slightly pull up the highlights. Try pulling 64 down to 60 and 191 up to 195. This results in a modest S-shaped curve that slightly increases the overall contrast.

Color Saturation
4 Most photographers will want to increase the color saturation of their images. This is another area of considerable debate, but a generally accepted rule of thumb is to increase an image's color saturation by about 5% to 10%. This will add some vibrant punch to your photography. Anymore than this amount most likely will make your colors too unbelievable, unless that's your desired goal. If you have a particularly important color that needs to be accentuated, you always can increase that color's saturation individually.


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