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FIGURE 12-9 The Levels dialog box
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The Levels tool is deceptively easy to use; the Levels dialog box contains a histogram with sliders, as shown in Figure 12-9 You can slide any of the histogram s three triangles to alter the tonal qualities of the image The left slider
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Set Black Point slider Midtone slider Apply Cancel and close Load settings Save settings Auto levels Advanced options Eyedroppers Live preview of adjustments Set White Point slider
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CHAPTER 12: Enhance Your Photographs
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(black) controls the shadows, the middle (gray) slider controls the midtones, and the right slider controls the highlights
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Highlights
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One of the most common problems in photos is lack of light, which causes the image to appear too dark (underexposed) This can be remedied while shooting by using a slower shutter speed or larger aperture, thus letting more light into the camera s sensor or film Of course, if you are working on an image in Photoshop, it s a bit late to wind back the clock and change your shutter speed Fortunately, the Levels tool comes to the rescue The image in Figure 12-10 looks dull and lacking in brightness Choose Image | Adjustments | Levels, and you will see that the histogram doesn t show any information on the right end This means that all the pixels are concentrated in the midtones and shadows portions of the image The lack of histogram peaks on the right means that no highlights are present in the image By sliding the Highlights slider to the left and causing it to touch the area where the histogram information begins, we have brightened up the image (see Figure 12-11)
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FIGURE 12-10 Dull image lacking in highlights
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FIGURE 12-11 Brightening up the image
How to Do Everything with Photoshop CS2
Fixing Shadows
Another common problem with images is a lack of contrast, when all the pixel information is concentrated in the midtones and highlights This results in a faded appearance that lacks visual punch Figure 12-12 shows a washed-out image If you look at the histogram, you can see that information in the shadow area (the leftmost area) is lacking This is easy to fix Choose Image | Adjustments | Levels Drag the Shadows slider (the black triangle in Figure 12-9) toward the right, and notice the contrast change in the image as the shadows are darkened, as shown in Figure 12-13 In this case, we moved the slider a little to the right, close to the Midtone area, and increased the highlights a little by moving the Highlights slider to the left
FIGURE 12-12 Image lacking contrast
Fixing Midtones
At times, the shadows and highlights in an image are correct, but the image still doesn t look its best The problem, in the case of Figure 12-14, is in the midtones The shadows are nice and dark and the highlights are nice and bright, but the midtones are dark and don t show much detail Choose Image | Adjustments | Levels Slide the Midtone slider (the gray triangle) to the left As you move the slider, you will see the image midtones brighten up If you slide to the right, the midtones will get darker In Figure 12-15, we have moved the slider to the left and the midtones are improved Notice that details, such as the curtain, are now showing; these details were lost in the shadows before we made the adjustments
FIGURE 12-13 Darkening the shadows
Colin Smith
CHAPTER 12: Enhance Your Photographs
FIGURE 12-14 Midtones are too dark
FIGURE 12-15 Lightening the midtones
Auto Levels
In the Levels dialog box, click the Auto button, and the brightest point in the image will be set to white and the darkest point will be shifted to black All the tones in between will compensate automatically This setting works well for some images and not so well for others It s usually best to set the levels manually so you can control the results If you are in a rush, you could try the Auto setting if the result is not what you want, you can simply undo the change and make the adjustments manually You can also access the auto controls by choosing Image | Adjustments, and then choosing Auto Levels or Auto Contract
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