ptg Chapter 8 Understanding Colors and Channels 207 The Photo Filter adjustment lets you apply a specific filter or color to an image. Applying the Photo Filter adjustment to an image is similar to placing a colored filter in front of a camera lens. Photographers use fil- ters to help correct color problems associated with unique lighting conditions like early morning sunlight or indoor fluorescent lighting. You can use Photoshop's Photo Filter adjustments to get the same results using color, density, and luminosity options. Using the Photo Filter Adjustment Use the Photo Filter Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Photo Filter. Click the Filter option, click the Filter list arrow, and then select from the available color filter options. Click the Color option to select a user-defined color filter. Drag the Density slider left or right to adjust the intensity of the filter effect on the active image. The higher the value, the greater the effect. Select the Preserve Luminosity check box to preserve the color of the image highlights. Select the Preview check box to view changes to the active image. Click OK. 8 7 6 5 4 3 2 1 5 6 8 3 4 7 Cooling Photo Filter applied to the image From the Library of Wow! eBook ptg 208 Chapter 8 The Invert command reverses the colors and tonal values to their oppo- site values, in effect, creating a negative. The Equalize command exag- gerates contrast between similar color values. It’s useful in finding stray pixels in a seemingly solid color, or to produce a special color effect. Using the Invert and Equalize Commands Use the Invert Command Open an image. Click the Image menu, point to Adjustments, and then click Invert. The brightness values of each image channel are reversed, creating a negative color or grayscale image. Use the Equalize Command Open an image. Click the Image menu, point to Adjustments, and then click Equalize. The brightness values of the image pixels are distributed in a way that more accurately represents the entire range of brightness levels from white to black. 2 1 2 1 1 Invert adjustment applied to the image 1 Equalize adjustment applied to the image From the Library of Wow! eBook ptg Chapter 8 Understanding Colors and Channels 209 The Threshold adjustment reduces an image into only black and white pixels, based on their original brightness levels. It's useful for locating the darkest and lightest pixels in an image, or for creating some great- looking black and white special effects. The Posterize adjustment cre- ates a simpler image by reducing the number of colors. It's useful for creating an image with a clip art look, or for reducing the number of colors in preparation for output to the Web. Using the Threshold and Posterize Adjustments Use the Threshold Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Threshold. Drag the Threshold slider to the right or left to change the point at which black and white are defined. For example, setting the threshold slider to a value of 75 creates an image where all pixels with a brightness value of 75 or less are black, and all pixels with a value of 76 or higher are white. Click OK. Use the Posterize Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Posterize. Drag the slider to select a Levels value (2 to 255) to define the number of colors used. Lower values produce less colors and more visual contrast. Click OK. 4 3 2 1 4 3 2 1 4 3 Posterize adjustment applied to the image. Threshold adjustment applied to the image. 3 4 From the Library of Wow! eBook ptg 210 Chapter 8 With HDR Pro (New!), you can go beyond the capture capabilities of your camera by combining multiple images into a single HDR (High Dynamic Range) image that preserves the tonal quality of the images. You can use the HDR Toning command on the Adjustments menu to specify how you want to merge images, map tones, and style the out- put. You can have Photoshop automatically align the merging images and remove any ghosting due to people moving or misalignment during consecutive shots, or you can do it manually. If you don’t have multiple images, you can use the HDR Toning command (New!) with a single image to simulate the toning mapping process to create the look of an HDR-processed image. You can even use HDR Pro along with Photomerge—an image stitching feature—for high-quality panoramic images. To help you get started with the image files you want to change, you can use the Auto Stack Panorama/HDR files option in Adobe Bridge CS5 or the Merge To HDR command in the Mini Bridge panel from within Photoshop. Using the HDR Toning Adjustment Access Files in Mini Bridge for HDR Toning Adjustments Click the Mini Bridge button on the Application bar. ◆ If prompted, connect to Adobe Bridge. Navigate to the location with the files you want to use. Select the files you want to adjust in HDR toning. Click the Tool button, point to Photoshop, and then click Merge to HDR Pro. Photoshop brings the selected images into the program, and then opens them up in the Merge to HDR Pro dialog box. Go to the next page for information on using the HDR Toning adjustment options. 4 3 2 1 1 2 4 3 From the Library of Wow! eBook ptg Chapter 8 Understanding Colors and Channels 211 Use HDR Toning Adjustment Options Use the Merge to HDR Pro command in the Mini Bridge to create a multi-image document or open a single image document. ◆ If you opened a single image document, click the Image menu, point to Adjustments, and then click HDR Toning. If you opened a multi-image document, do any of the following: ◆ Images. Deselect the check boxes to exclude an image. ◆ Remove ghosts. Select to remove ghost images. Click the Preset list arrow, and then select the preset you want, such as Flat, Photorealistic high or low contrast, Monochromatic artistic, and Surrealistic. Click the Mode list arrow, and then select a bit depth for the image. Click the Method list arrow, and then select from the available options (vary based on the method): ◆ Exposure. Adjusts the highlight end of the image's tonal scale. ◆ Gamma. Adjusts the image gamma, using a simple power function. Similar to adjusting the midpoints in an image's brightness. To sa ve s ett ing s, cl ick t he Preset Options button, click Save Preset, type a name, and then click Save. Click OK. ◆ If a multi-image document, Photoshop creates a merged document that you can adjust the toning with the slider at the bottom of the document window. 7 6 5 4 3 2 1 7 2 3 Remove ghosts 5 For multi-image document For single-image document 6 3 6 7 5 4 From the Library of Wow! eBook ptg 212 Chapter 8 The Shadows/Highlights adjustment lets you quickly correct the prob- lems associated with the underexposed and overexposed areas of an image such as deep shadows or bright highlights. In addition, the Shadows/Highlights adjustment makes quick work out of images that have really dark shadows or overexposed areas by adjusting the prob- lem areas without changing the midtones in the image. However, this type of adjustment will not work on images in the CMYK color mode. Using the Shadows/ Highlights Adjustment Use the Shadows/Highlights Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Shadows/Highlights. If necessary, select the Show More Options check box to display Adjustments options. Drag the Shadows Amount, Tonal Width, and Radius sliders right or left to adjust the shadow areas of the active image. Drag the Highlights Amount, Tonal Width, and Radius sliders right or left to adjust the highlight areas of the active image. Drag the Adjustments Color Correction and Midtone Contrast sliders left or right to decrease or increase the color saturation values of the adjusted areas of the image. Enter values from 0% to 50% in the Black Clip and White Clip boxes to indicate how much of the shadow and highlight values will be clipped in the new image. Greater values produce images with more contrast. Select the Preview check box to view changes to the active image. Click OK. 9 8 7 6 5 4 3 2 1 6 5 9 4 3 8 7 From the Library of Wow! eBook ptg Chapter 8 Understanding Colors and Channels 213 The Black & White adjustment allows you to convert a color image to grayscale. During the adjustment process you can control how individ- ual colors (Reds, Yellows, Greens, Cyans, Blues, and Magentas) are converted. You can also apply a tint to the grayscale image by adjusting the hue and saturation, in a similar way to using the Channel Mixer. If you're not sure how or where to start, you can use the Auto button to set grayscale values based on maximizing the distribution of gray values. Using the Black & White Adjustment Use the Black & White Adjustment Open an image. Click the Image menu, point to Adjustments, and then click Black & White. To se le ct a se t of pr ese t mix l ev els , click the Preset list arrow, and then select the preset you want. To se t au to ad jus tme nts , cl ick Auto. Continue with manual adjustments, or skip to Step 8. Drag the Reds, Yellows, Greens, Cyans, Blues, and Magentas sliders to the desired levels. ◆ Alt+click (Win) or Option+click (Mac) a color box to reset a slider to its initial setting. To ad ju st th e tin t, se lec t th e Tint check box, and then adjust the Hue and Saturation. To sa ve s ett ing s, cl ick t he Preset Options button, click Save Preset, type a name, and then click Save. Click OK. 8 7 6 5 4 3 2 1 7 Black & White adjustment applied to the image 3 8 5 6 4 From the Library of Wow! eBook ptg This page intentionally left blank From the Library of Wow! eBook . multi-image document, Photoshop creates a merged document that you can adjust the toning with the slider at the bottom of the document window. 7 6 5 4 3 2 1 7 2 3 Remove ghosts 5 For multi-image document For. multi-image document or open a single image document. ◆ If you opened a single image document, click the Image menu, point to Adjustments, and then click HDR Toning. If you opened a multi-image document,. use the Auto Stack Panorama/HDR files option in Adobe Bridge CS5 or the Merge To HDR command in the Mini Bridge panel from within Photoshop. Using the HDR Toning Adjustment Access Files in Mini