Photoshop cs5 by steve Johnson part 32 ppt

ptg 200 Chapter 8 The Curves adjustment lets you adjust tonal ranges in the image with- out changing image exposure. Curves is an excellent adjustment method for lightening the dark shadows of an image to bring out detail, or for creating special effects like solarization. To make it easy to use, Photoshop provides presets to use and save. The Color Balance adjust- ment lets you change the highlight, shadows, and midtones of an image separately. The Color Balance dialog box performs linear adjustments to color; therefore, it's a good tool for correcting common tonal prob- lems, such as those caused by using film balanced for daylight indoors and getting a green cast to the image. The Brightness/Contrast adjust- ment changes an image by an overall lightening or darkening of the image pixels. While good for special effects, its linear way of changing an image's brightness and contrast do not lend themselves well to photo restoration. Curves and Levels are much better for this type of work. Using Curves and Color Adjustments Use the Curves Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Curves. To se lect preset mix levels, click the Preset list arrow, and then select the preset you want. Click the Channel list arrow, and then select the composite channel. Drag the Black and White sliders to adjust tonal values. Click on the diagonal line to add an edit point, and then drag up or down to increase or decrease the tonal values of the active image. Use the Eyedropper tools to select tonal values directly in the active image window. Select the Preview check box to view changes to the image. Click the curve option to adjust the curve by adding points or click the pencil option to draw a curve. To sa ve settings, click the Preset Options button, click Save Preset, type a name, and then click Save. Click OK. 11 10 9 8 7 6 5 4 3 2 1 6 4 8 7 9 3 10 11 5 Select additional options to show different looks. From the Library of Wow! eBook ptg Chapter 8 Understanding Colors and Channels 201 Use the Color Balance Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Color Balance. Drag the CMYK to RGB sliders to adjust the color. Click a Tone Balance option. Click OK. Use the Brightness/Contrast Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Brightness/Contrast. Drag the Brightness slider left to decrease the brightness values or right to increase the values of the colors in the active image. Drag the Contrast slider to the left to decrease the color steps or right to increase the steps in the image. If you prefer the CS2 method for Brightness/Contrast, select the Use Legacy check box. Click OK. 6 5 4 3 2 1 5 4 3 2 1 4 6 5 3 4 3 5 Did You Know? You can use a selection to control Brightness/Contrast. Use any of the selection tools to isolate a portion of the image before using the Brightness/ Contrast adjustment, and then only the selected areas will be adjusted. Understanding Brightness and Contrast The Brightness/Contrast adjustment performs linear adjustments to an image. For example, moving the brightness slider to the right will increase the brightness values of all the pixels in the image equally. Since photographs are not linear in nature, the Brightness/Contrast adjustment is not recommended for use on images. Instead, use a Levels, or a Curves (non-linear) adjustment for photographs, and a Brightness/Contrast adjustment for clip art, text, and non- photographic images. For Your Information From the Library of Wow! eBook ptg 202 Chapter 8 The Hue/Saturation adjustment gives you individual control over an image's Hue, Saturation, and Brightness, and its Colorize option lets you apply an overall color cast to an image, similar to a duotone effect. The Desaturate command removes all the color from an image, which preserves the Hue and Brightness values of the pixels, and changes the Saturation value to zero. The result is a grayscale image. Adjusting Hue and Saturation Adjust Hue/Saturation Open an image. Click the Image menu, point to Adjustments, and then click Hue/Saturation. Click the Preset list arrow, and then select a preset, such as Cyanotype, Sepia, or Red Boost. Drag the Hue, Saturation, and Lightness sliders to adjust levels. Click the Edit list arrow, select a color, and then click inside the active image with the eyedropper tools to adjust the Hue/Saturation. Select the Preview check box to see how your image looks. Select the Colorize check box to tint with the foreground color. Click OK. 8 7 6 5 4 3 2 1 8 4 6 7 Eyedropper tools 3 Did You Know? You can Desaturate an image. Open the image, click the Image menu, point to Adjustments, and then click Desaturate. You can Desaturate selected areas of an image using the Sponge tool. Click the Sponge tool, click Desaturate on the Options bar, and then drag to slowly remove color from the image. 5 Adjusting Saturation Using Vibrance Vibrance adjusts the saturation so clipping is reduced as colors approach full saturation. You can adjust vibrance of an adjustment layer in the Adjustments panel or for the image layer in the Vibrance dialog box (click the Image menu, point to Adjustments, and then click Vibrance). Drag the Vibrance slider to the right to apply more adjustment to less saturated colors and prevent clipping; drag the Saturation slider to the right to apply the same amount of adjust- ment. Drag either slider to the left to decrease saturation. For Your Information From the Library of Wow! eBook ptg Chapter 8 Understanding Colors and Channels 203 The Match Color adjustment lets you select colors in the image, and then match and change them—using Luminance, Color Intensity, and Fade sliders—to another image. The Match Color adjustment will only work on images in the RGB Color mode. Match Color is a great tool to help you get that consistent look you'll need when you need to match colors between images. Using the Match Color Adjustment Use the Match Color Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Match Color. Drag the various sliders (Luminance, Color Intensity, and Fade) to adjust the image. Select the Neutralize check box to automatically remove any color cast in the active image. Click the Image Statistics Source list arrow, and then select another image or layer for matching the color in the Destination Image. If you select a portion of an image before entering the Match Color dialog box, you can choose whether to use the selection in the source or the target document to calculate the color match. Click Save Statistics to save the current adjustment, or click Load Statistics to load adjustments made to other images. Select the Preview check box to view changes to the active image. Click OK. 8 7 6 5 4 3 2 1 3 8 5 4 6 7 From the Library of Wow! eBook ptg 204 Chapter 8 6 5 9 4 3 7 The Selective Color adjustment is designed to give you the ability to add or subtract specific amounts of cyan, magenta, yellow, and black inks. This is an excellent tool for making adjustments to an image based on a color proof, or for adding/subtracting certain primary colors based on information supplied by your printer. You can adjust color values for CMYK (Cyan, Magenta, Yellow, and Black), specify a color using a per- centage of the color’s total ink, and change an existing color using an absolute value of 1% to 100%. Using the Selective Color Adjustment Use the Selective Color Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Selective Color. Click the Colors list arrow, and then click the specific color to adjust. Drag the Cyan, Magenta, Yellow, and Black sliders to the right or left to decrease or increase the color values. Click the Relative option to change the selected color using a percentage of the color’s total ink. Click the Absolute option to change the existing color using an absolute value of 1% to 100%. Select the Preview check box to view changes to the active image. To sa ve settings, click the Preset Options button, click Save Preset, type a name, and then click Save. Click OK. 9 8 7 6 5 4 3 2 1 8 From the Library of Wow! eBook ptg Chapter 8 Understanding Colors and Channels 205 The Channel Mixer adjustment is a great way to adjust individual color channels, or for making an image conversion to black and white. The Channel Mixer adjustment modifies the selected output channel by blending it with a mix of the existing image color channels. Since color channels record information using shades of gray, you're essentially adding or subtracting grayscale information, not color information like when you use the Selective Color adjustment. That's what makes the Channel Mixer adjustment ideal for converting images into grayscale. To th e make it easy to use, Photoshop provides presets to use an d save. Using the Channel Mixer Adjustment Use the Channel Mixer Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Channel Mixer. To se lect a set of preset mix levels, click the Preset list arrow, and then select the preset you want. Click the Output Channel list arrow, and then select from the available output channels. Drag the Source Channels sliders right or left to increase or decrease the colors in the active image. Drag the Constant slider left or right to adjust the grayscale output of the active image. Dragging to the left adds more black to the image; dragging to the right adds more white. Select the Monochrome check box to convert the colors of the image into shades of gray. Select the Preview check box to view changes to the active image. To sa ve settings, click the Preset Options button, click Save Preset, type a name, and then click Save. Click OK. 10 9 8 7 6 5 4 3 2 1 5 7 6 8 34 9 10 From the Library of Wow! eBook ptg 206 Chapter 8 6 4 3 5 Gradient map applied to the image The Gradient Map adjustment replaces the tonal values of the image with the colors supplied by a gradient. It's a great tool for generating special color effects. In addition, the Gradient Map adjusts the active image's colors to the colors of the selected gradient, taking the shad- ows of the image and mapping them to one end point of the gradient, and the highlights to the other point. You can also specify options to dither or reverse the color gradient. Select the Preview check box to preview your changes in the document window. Using the Gradient Map Adjustment Use the Gradient Map Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Gradient Map. Click the Gradient Used for Grayscale Mapping list arrow to adjust the gradient. Select or clear the Dither or Reverse check boxes for the Gradient Options. Select the Preview check box to view changes to the active image. Click OK. 6 5 4 3 2 1 From the Library of Wow! eBook . prob- lems, such as those caused by using film balanced for daylight indoors and getting a green cast to the image. The Brightness/Contrast adjust- ment changes an image by an overall lightening or. bring out detail, or for creating special effects like solarization. To make it easy to use, Photoshop provides presets to use and save. The Color Balance adjust- ment lets you change the highlight,. the Preview check box to view changes to the image. Click the curve option to adjust the curve by adding points or click the pencil option to draw a curve. To sa ve settings, click the Preset