Using Curves and Color Adjustments Use the Curves Adjustment Open an image.. Click the Image menu, point to Adjustments, and then click Curves.. Click the Image menu, point to Adjustm
Trang 1The 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 select 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 save settings, click the Preset
Options button, click Save Preset,
type a name, and then click Save.
Click OK.
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Select additional options to show different looks.
Trang 2Use 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.
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Did You Know?
You can use a selection to control
Brightness/Contrast Use any of the
selection tools to isolate a portion of
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
Trang 3The 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.
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Eyedropper tools
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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
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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
Trang 4The 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.
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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 save settings, click the Preset
Options button, click Save Preset,
type a name, and then click Save.
Click OK.
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Trang 6The 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 the make it easy to use, Photoshop provides presets to use and 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 select 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 save settings, click the Preset
Options button, click Save Preset,
type a name, and then click Save.
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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.
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