Click the Image menu, point to Adjustments, and then click Photo Filter.. The Threshold adjustment reduces an image into only black and white pixels, based on their original brightness
Trang 1The 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.
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Cooling Photo Filter applied to the image
Trang 2The 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
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Invert adjustment applied to the image
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Equalize adjustment applied to the image
Trang 3The 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
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Posterize adjustment applied to the image.
Threshold adjustment applied to the image.
Trang 4With 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
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Trang 5Use 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 save settings, click the Preset
Options button, click Save Preset,
type a name, and then click Save.
Click OK.
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Remove ghosts
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For multi-image document
For single-image document
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Trang 6The 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.
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Trang 7The 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 select a set of preset mix levels,
click the Preset list arrow, and
then select the preset you want
To set auto adjustments, click
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 adjust the tint, select the Tint
check box, and then adjust the
Hue and Saturation
To save settings, click the Preset
Options button, click Save Preset,
type a name, and then click Save.
Click OK.
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Black & White adjustment applied to the image
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