ADJUSTING SKIN TONE IN PHOTOSHOP
Adjusting Skin Tone in Photoshop CS5
Let's start the discussion on improving photos by looking at what is wrong with the first image at the left. At first glance, if you are new to photo enhancement, and cannot see the corrected image, it may not look too bad.
However, there are several problems with the image that take away the impact and make what should be a dramatic photo fade into oblivion. Compare this image to the enhanced version at the bottom of the page. Notice how the first one seems dull and uninspired compared to the second. The enhanced image pops off the page and really grabs your attention.
The transition from the image at the left to the one at the bottom of the page is accomplished in steps. The steps I have learned to follow are contrast, tone, color and finally sharpening. Occasionally an image only needs one or two minor adjustments, and really bad, or specialty photos, like jewelry, require more than this list of enhancements. However, it is a good starting point.
The Levels Control is another way to modify the color in an image. Like curves, Levels also lets you change the color across the tonal range, modifying a composite image or individual color channels. The dialog features a histogram method of displaying image data that is unique and sometimes useful. It shows the full range of tonal values, from light to dark, on a linear scale. A graph rises and falls across that scale, indicating the actual number of pixels in the image that have the corresponding value. Therefore, as a general rule you would want a nice rounded curve that is highest in the mid-tones, with good representation in the highlight and shadow ends of the spectrum.
The Levels control uses highlight, midpoint, and shadow slides, which shift the image values in the histogram, lightening or darkening the image. I find this three variable approach limiting compared to the unlimited number of points I can place and manipulate on a curve. On the other hand, until I became comfortable with color numbers, Levels was my main color control. It also allows you to set white and black points, and delivers decent results for basic to intermediate changes.
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