ADOBE PHOTOSHOP CS5 DESIGN 26 by odiaworld

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									                        Working with Professional Color Correctors                        599

 ✓ If your display is set to Light, adjust your highlights by moving points in
   the top-right of the curve, shadows by adjusting points in the bottom-left
   of the curve, and midtones by moving points in the center of the curve.
 ✓ A gently sloped S-shaped curve increases contrast, especially in the
   highlight and shadow areas. Using a curve like this also helps to define
   the midtones.
 ✓ For ultimate control, Photoshop lets you draw a curve with the precise
   shape you want, creating an arbitrary curve or map. Click the Pencil tool
   and then draw peaks and valleys in the Curves dialog box. Watch the
   changes in your original image.
 ✓ You can also add points to the curve by holding down Ctrl (Ô on the
   Mac) and clicking your image. Adding points is beneficial if you want to
   preserve an area in your image.
 ✓ If you want to adjust the color in your image, select your desired chan-
   nel from the Channel pop-up menu and then adjust the curve. For more
   on channels, see Book VI.

Arbitrary maps, such as the one shown in Figure 1-17, create distinctive
solarization color effects when Photoshop warps the colors of your image.
They’re fun to play with, maybe useful now and then, but not nearly as prac-
tical as S curves.




                                                                                                     Book VIII
                                                                                                     Chapter 1
                                                                                                        Enhancing Images
                                                                                                        with Adjustments




                                                                              Corbis Digital Stock
Figure 1-17: Going crazy with the Curves maps can result in a solarization-like effect.
600      Working with Professional Color Correctors


             After you create a custom curve, you may want to save it (a good idea) to
             load and apply it to other photos with similar contrast issues. Click the
             Preset Options button (just to the left of the OK button) and select Save
             Preset from the pop-up menu that appears.


             Converting to Black & White
             Photoshop provides a great way to convert a color image to grayscale with
             the Black & White feature. For other ways to make your image grayscale, see
             Book II, Chapter 2 and the section “Washing Out Color with Desaturate,” ear-
             lier in this chapter.

             The great thing about the Black & White feature is that, like the Channel
             Mixer (which you can read about in Book VI, Chapter 1), you have a lot of
             control over how your colors are converted.

             Here’s how to go to grayscale by using Black & White:

               1. Choose Image➪Adjustments➪Black & White.
                  Your Black and White dialog box appears, as shown in Figure 1-18. In
                  addition, Photoshop automatically applies a default conversion to your
                  image.




                                                                                    Dreamstime

Figure 1-18: Convert color images to grayscale with the Black & White adjustment.


               2. Adjust the conversion to your liking by doing one of the following:
                    • Choose a Preset: Select a preset conversion (or a custom one you
                      saved previously) from the pop-up menu. Note that you can also use
                      one of the presets as a starting point and then adjust from there.
                    • Click Auto: This option analyzes your image’s color values and then
                      converts to grayscale, while trying to maximize your gray tonal val-
                      ues. Again, this conversion can be used as a starting point.
                    Working with Professional Color Correctors           601

     • Adjust the sliders: Do your own thing. Drag the sliders left to darken
       and right to lighten the tones. That’s what I did in my example in
       Figure 1-18. Note that your mouse turns into an eyedropper when
       you move or click over your image. Click areas of your image to high-
       light that dominant color in your dialog box. Click and drag on the
       image itself with the eyedropper to move the color slider for that
       color, making it darker or lighter.
 3. If desired, select the Tint button to apply a tone of color to the black-
    and-white image.
    Adjust the Hue and Saturation sliders to choose a tint color and inten-
    sity of that color. Click the color swatch to access the Color Picker,
    where you can select another color.

If you totally goof up your image, hold down Alt (Option on the Mac) and
click the color chip to reset that adjustment. To reset all adjustments, hold
down Alt (Option on the Mac) to convert the Cancel button into Reset, and
then click that button.

After you establish a custom conversion setting, save it to apply to other
similar images by selecting Save Preset from the Preset Options pop-up
menu, just to the left of the OK button.


Getting colorful with Hue/Saturation
Photoshop’s Hue/Saturation controls let you adjust colors based on their hue,
saturation, and lightness. The Hue/Saturation dialog box doesn’t work with
the Red, Green, and Blue (or Cyan, Magenta, Yellow, and Black) channels of an
image. Instead, it operates on the different colors, or hues. You can select all
the colors (Master) or one color to modify from the Edit pop-up menu.

Three sliders are in the Hue/Saturation dialog box. (See Figure 1-19.)

 ✓ Hue: Shifts all the colors clockwise or counterclockwise around the
   color wheel, depending on the direction you move the slider. I moved            Book VIII
   my Hue slider to the left to turn the image green and purple.                   Chapter 1
 ✓ Saturation: Increases or decreases the richness of the colors in an                Enhancing Images
                                                                                      with Adjustments

   image. I moved my Saturation slider to the right to increase the satura-
   tion and make the image almost glow.
 ✓ Lightness: Modifies the brightness values.

You can adjust any of these values by moving the sliders and watching the
results in the image window. The top color bar at the bottom of the dialog
box represents the colors in their order on the color wheel before you made
any adjustment. The lower color bar shows how the modifications you make
affect the colors.
602   Working with Professional Color Correctors




                                                                                           ImageState
         Figure 1-19: The Hue/Saturation command enables you to adjust colors based on their hue
         (color), saturation (intensity), or lightness (brightness).


         Select the slider (the pointing finger icon) to adjust your Hue and Saturation
         values. With the icon selected, drag directly on your image to adjust the
         Saturation. Hold down the Ctrl (Ô on the Mac) key and drag on your image
         to adjust the Hue.

         When you select an individual color to adjust, sliders appear between the
         color bars so that you can define the range of color to be adjusted. You can
         select, add, or subtract colors from the range by selecting one of the
         Eyedropper tools and clicking in the image.

         You can also select a Hue/Saturation preset, such as Old Style or Sepia, from
         the Preset pop-up menu in the Hue/Saturation dialog box.

         The Hue/Saturation dialog box also lets you colorize images, a useful option
         for creating sepia-colored images, like in the Putting It Together project
         “Making a New Photo Look Old,” in this chapter.


         Using the Colorize option
         Use the Colorize option in the Hue/Saturation dialog box to change the color
         of any selected area to a new, solid color. This option is unlike the Hue
                       Working with Professional Color Correctors            603

slider, which changes only individual pixels based on their present color
values. Just follow these steps:

 1. Open an image and access the Hue/Saturation dialog box by choosing
    Image➪Adjustments➪Hue/Saturation or pressing Ctrl+U (Ô+U on
    the Mac).
 2. Select the Colorize option.
 3. Drag the Hue slider in either direction to change a color.
    Photoshop doesn’t colorize pure white pixels and pure black pixels because
    colorization affects only gray pixels (from a brightness value of 1 to 254).
    You can also adjust the Saturation and Lightness, if desired.


Pumping up the Vibrance
Think of the Vibrance adjustment as a souped-up, more intelligent Hue/
Saturation command. This adjustment increases the saturation in an image
but does it in a nonlinear fashion. Therefore, pixels with a lower saturation
get more adjustment, and pixels with a higher saturation get less. As a
bonus, the adjustment includes a built-in skin-tone protector to prevent
faces from becoming overly red. Choose Image➪Adjustments➪Vibrance. In
the Vibrance dialog box, move the Vibrance and Saturation sliders to the
right to increase each. But use a light touch with this adjustment. A little
goes a long way, as shown in Figure 1-20.




                                                                                   Book VIII
                                                                                   Chapter 1
                                                                                      Enhancing Images
                                                                                      with Adjustments




Figure 1-20: The Vibrance command increases saturation in a nonlinear way.
604     Working with Professional Color Correctors


      Putting It Together

            Making a New Photo Look Old
            Black-and-white photography is a newer phenomenon than you might think. Daguerreo-
            types and other early photographs frequently had a brownish or bluish tone to them.
            You can create sepia-toned masterpieces of your own. (Or, if you want, you can create
            a tint in green, blue, or another shade.) Toned pictures can create a mood or otherwise
            transform a mundane photo into something interesting.

            In this Putting It Together project, I chose a recent photo
            of a boy and his donkey in Java, Indonesia. Without any
            nasty anachronisms, such as automobiles or satellite
            dishes, aging this image is easy.

            The Photoshop Hue/Saturation feature is all you need to
            perform this time-traveling magic. Just follow these easy
            steps:

            1.   Open the image in Photoshop and convert it to black
                 and white by choosing Image➪Adjustments➪
                 Black & White. Click OK.
                 You choose this command rather than the
                 Image➪Mode➪Grayscale command to convert the
                 photo to black and white because you’re going to
                                                                                           Corbis Digital Stock
                 continue to work with it as a color image — the
                 image just won’t have colors until you
                 add them. For more info on the Black &
                 White adjustment, see the earlier sec-
                 tion, “Converting to Black & White.”
            2.   Choose Image➪Adjustments➪
                 Hue/Saturation.
                 The Hue/Saturation dialog box
                 appears.
            3.   Select the Colorize check box so that
                 you can add color to the image.
            4.   Adjust the Hue slider to produce the
                 tone you’re looking for.                                                  Corbis Digital Stock


                 To produce a rich sepia tone, move the
                 Hue slider to the far left. If you prefer green, blue, or some other shade, you can
                 experiment with this slider to get the exact color you want.
            5.   Adjust the Saturation slider to modify the richness of the color.
                 I used a setting of 25, as shown in the figure. When you move the slider to the right,
                 the color becomes more pure. You end up with a striking red at the far-right position.
                                       Matching Color between Documents           605


      6.   Adjust the Lightness slider to lighten or darken the
           photo, depending on your mood.
           Generally, you want to leave the Lightness slider at
           the default middle position. To create a darker,
           moodier picture, move it to the left; to produce a
           more faded look, move it to the right.
      7.   When you’re satisfied with your changes, click OK.
           Now, my photo looks like a vintage postcard.
           You can create similar effects by using the Photo-
           shop Duotones, Tritones, and Quadtones features.
           See Book II, Chapter 2 for more information on these
           tools. You can also try the Tint options in the Black
           & White adjustment. (See the section “Converting
           to Black & White,” in this chapter.)                       Corbis Digital Stock




Matching Color between Documents
      The Match Color command enables you to match colors in a single image or
      between images — a source image and a target image. But it doesn’t stop
      there. You can also match colors between layers or even selections. You can
      further refine your correction by adjusting the luminance and color intensity
      (saturation).

      This command is great for getting rid of colorcasts in a single image. It also
      works wonders for matching the color of the lighting between two images or
      layers — for example, use it if you want to realistically composite an image
      shot under fluorescent lighting and one shot in natural light.

      The Match Color command works only with RGB images, but be sure to
      apply this command before you perform any color conversions.                           Book VIII
                                                                                             Chapter 1
      Follow these steps to use the Match Color command to match one image                      Enhancing Images
      with another:
                                                                                                with Adjustments



       1. Open the two images you want to match.
           If you want, you can make selections in one or both of those images —
           for example, if you’re creating a composite image from two separate
           images and want to match the lighting color or skin tones. Without
           selections, the overall target image is matched to the source image. In
           my example in Figure 1-21, I selected an image taken outdoors in natural
606   Matching Color between Documents


             light and one taken inside under fluorescent lights (which give that
             image a nasty green colorcast). I want to use the girl in each image in a
             composite and therefore want to try to match the skin tones.




             Figure 1-21: The Match Color command lets you match colors within a
             single image or between two images.


          2. Make sure your target image (the one that needs to be corrected) is
             the active file, and choose Image➪Adjustments➪Match Color.
             If you’re using a specific layer in your target image, select that layer
             prior to choosing the command. Make sure you select the Preview
             option so that you can view your adjustments on the fly.
          3. In the Match Color dialog box, shown in Figure 1-22, select your
             source image from the Source pop-up menu in the Image Statistics
             area.
             Select None if you’re working with only one image (if the source image
             and target image are the same).
             Remember, the source image contains the colors you want to match in
             the target image.
          4. If you’re using a particular layer in your source image, select it from
             the Layer pop-up menu.
             Or choose the Merged option to match the colors from all the layers.
                             Matching Color between Documents       607




  Figure 1-22: Match color between two images with different
  lighting.


5. If you have selections in your images, you can select one of the follow-
   ing options:
   • If you have a selection in your target image but want to match the
     colors from the whole image, select the Ignore Selection when
     Applying Adjustment option.
   • Select the Use Selection in Source to Calculate Colors option if you
     want to use the colors in the selection in the source image to calcu-
     late the adjustment. Deselect this option to ignore the selection in     Book VIII
     the source image and match the colors from the entire source image.      Chapter 1
   • Select the Use Selection in Target to Calculate Adjustment option if        Enhancing Images
                                                                                 with Adjustments

     you have a selection in the target image and want to use the colors in
     the selection to calculate the adjustment. If it’s deselected, the
     adjustment is calculated using the colors of the whole image.
6. Select the Neutralize option to remove any colorcasts in the target
   image.
  When using the Match Color command, your cursor becomes the
  Eyedropper tool. This allows you to sample colors on your images and
  look at the color values in the Info panel while making your adjustments.
608   Switching Colors with Replace Color


          7. Adjust the luminance by moving the slider or entering a value.
             A higher value increases the brightness in the target image. A lower
             value decreases brightness.
          8. Adjust the color intensity of your target image.
             A higher value increases the color saturation, and a lower value
             decreases the saturation. Moving the slider to 1 desaturates the image
             to grayscale.
          9. Use the Fade option to control the amount of
             adjustment that is applied to the target
             image, moving the slider to the right to
             reduce the amount.
             If you move the slider all the way to the right,
             the image returns to its original colors.
         10. If you want to save your settings to use on
             other images, click the Save Statistics button.
             Then, in the Save dialog box that appears,
             name the file, specify the location, and click
             Save.
             To reload the settings later, click the Load
             Statistics button and navigate to the file.
         11. Click OK to apply the adjustment and exit
             the dialog box.
                                                                Figure 1-23: These tones
         My image, shown in Figure 1-23, has less of that       are a better match with the
         nasty green cast from the fluorescent lighting.        target image.


Switching Colors with Replace Color
         The Replace Color command creates interesting creative effects by allowing
         you to substitute one set of colors for another. It builds a mask, using colors
         you select, and then replaces the selected colors with others that you spec-
         ify. You can adjust hue, saturation, and lightness of the masked colors.

         Just follow these steps:

          1. Choose Image➪Adjustments➪Replace Color.
             The Replace Color dialog box appears, as shown in Figure 1-24.
          2. Choose either Selection or Image:
              • Selection: Shows the mask in the Preview window. The masked area
                is black, semitransparent areas are shades of gray, and unmasked
                areas are white.

								
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