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Adjusting Tone and Color in Your Photographs PC QuickSteps Getting to Know Your PC
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When you drag sliders to the right, you move the color-casting to that color channel s color opposite yellow, in this case Here is a traditional artist s color wheel that represents the hue spectrum; you ll want to refer to this wheel in later sections of this chapter, as well as in other chapters
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USE INPUT OR OUTPUT LEVELS
When you add contrast and detail to the tones in an image with Levels, you re using the Input Level sliders The Output Level sliders at the bottom of the box perform the opposite function: they decrease contrast and in general make an image tonally weaker The purpose of these sliders is primarily to prep an image for commercial offset printing; printers cannot capture all the details you see on your monitor, and the practice goes that when you decrease contrast, thus clipping the lower and upper tones, a printing press tends to render these areas back into the finished printed product So unless you re a
Clearly, the color opposite across the wheel from blue is yellow Because the wood in the pumpkins photo was color neutralized, the orange of the pumpkins might have been moved a little too far into the blue hues To correct colors in Levels:
If your warm colors are casting cold, choose Blue from the Channel drop-down list, and then drag the Black Point and/or Midpoint (Input) sliders to the right If an image is casting too red, choose Red from the Channel drop-down list and then drag the Black Point or Midpoint Input sliders to the right If an image has an unattractive greenish cast because it s a scan of an old photo or you used fluorescent lighting, choose Green from the Channel drop-down list and then drag the Black Point or Midpoint Input sliders to the right
Use Exposure
Although the Exposure feature is primarily used in the creation of a High Dynamic Range (HDR) image this adjustment can also be used on 8- and 16-bit photographs, primarily for tonal changes
commercial press guru, the only reason you d ever want to touch the Output sliders is to deliberately create a special-effects faded image
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To use Exposure, click Image | Adjustments | Exposure to open the Exposure dialog box, shown in Figure 4-9 You have these options:
Exposure To increase the brightness of lighter areas with much less impact on the shadow areas, drag this slider to the right
Offset
To decrease the shadows and midtones with much less effect on the highlights, drag this slider to the left Dragging right reverses the effect To add contrast to the midtones, drag this slider to the right Dragging left broadens the midtone range and can often help restore image detail
Gamma Correction
The thumbnails in Figure 4-9 were driven to extremes with Exposure to serve as a better visual example The Exposure dialog box shown at right displays a realistic group of settings for a typical photo
Exposure +1 1
Offset +02 02
Gamma 20 8
Restore an Image with Shadows/Highlights
The Shadows/Highlights tone correction feature is invaluable for restoring photos taken with strong backlighting It lightens the shadow areas with very little effect on midtones or highlights To adjust the shadows and highlights:
Figure 4-9: Use Exposure to correct an image after you ve taken it, the same way you d use exposure with your camera
1 Click Image | Adjustments | Shadows/Highlights 2 Click Show More Options to access the complete set of controls 3 Under Shadows:
Drag the Amount slider to the right to lighten shadow areas in the photo Drag the Tonal Width slider to the right to increase the range of pixels lightened in
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