Our favorite way described here, is to use a Black & White adjustment layer because it enables us to control how the individual R, G, B and C, M, Y color channels are converted to graysc
Trang 1Next, we’ll show you several ways to strip color
from a layer without changing the document color
mode Our favorite way (described here), is to use a
Black & White adjustment layer because it enables
us to control how the individual R, G, B and C, M, Y
color channels are converted to grayscale values
To convert a layer to grayscale via a
Black & White adjustment:
1 In an RGB image, click a layer or the
Background.A
2 On the Adjustments panel, click the Black &
White button. The Black & White controls
appear on the panel
3 Do any of the following:
Click Auto to have the program choose the
set-tings for you (A, next page)or choose a preset
from the Preset menu You can customize the
settings, as described in the remaining steps
Adjust the sliders to control how each color is
converted to a particular gray level A lower
value produces a darker gray equivalent for a
color; a higher value produces a lighter gray
equivalent
Click the Targeted Adjustment tool on the panel, then drag horizontally over an area in the image to lighten or darken it The slider corresponding to the predominant color in that area will shift accordingly
4 To further adjust the grayscale conversion,
move the sliders, starting with Reds, Yellows,
Cyans, or Blues For example, you could try
using the Yellows slider to lighten or darken a portrait or to correct a landscape image that contains a lot of green (B–C, next page)
5 Optional: To apply a tint to the whole image,
check Tint, click the color swatch, choose a color from the Color Picker, then click OK
6 Optional: To restore some original color to the
whole layer uniformly, lower the opacity of the adjustment layer Or to restore color to select areas, click the adjustment layer mask thumb-nail, choose black as the Foreground color, then with the Brush tool, apply strokes to the image (for a subtle effect, lower the tool opacity first)
A In this image, the color differences between the skin tones and water naturally help
us to distinguish between them.
Converting layers to grayscale via a Black & White adjustment
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A To produce this grayscale version of the image, we chose
the Auto setting for a Black & White adjustment layer We
think the contrast between the figure and background needs
improvement.
C Now that the contrast between the figure and background has been improved, the figure stands out better.
AUTO-SELECTING THE TARGETED ADJUSTMENT TOOL ★
To have the Targeted Adjustment tool become selected automatically on the Adjustments panel when you create a Curves, Hue/Saturation, or Black & White adjustment layer, display the controls for one of those adjustment types, then choose Auto-Select Targeted Adjustment Tool
from the panel menu
ORCHESTRATING A SCENE
In our environment, as in fi ne art and photogra-phy, colors help to defi ne spatial and shape rela-tionships and draw our attention to specifi c parts
of a scene When converting an image to gray-scale, think about how you want to reinterpret the composition To orchestrate visual movement with lights and darks instead of color, choose gray levels based on which areas you want to draw the viewer’s attention to For example, say
a bright red shape is located in the center of the original composition Using the Black & White controls, you could lighten or darken that shape
to make it stand out from the surrounding grays
B To improve the contrast, we reduced the Cyans and Blues values to darken the water, and increased the Yellows value to lighten the woman’s neck and cheek.
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Applying a Vibrance adjustment
Using a Vibrance adjustment layer, you can either
strip the color completely from a layer or desaturate
a layer partially and then adjust the Vibrance to
control the color intensity
To desaturate a layer using a Vibrance
adjustment:
1 Click a layer or the Background in an RGB
image.A
2 On the Adjustments panel, click the Vibrance
button
3. Do either of the following:
For a simple, full desaturation, reduce the
Saturation to its lowest value (to –100).
To adjust the color vibrance as you desaturate
the layer, reduce the Saturation to between
–60 and –80,then to control the color intensity
in the now almost grayscale layer, increase or
reduce the Vibrance value B–D The Vibrance
option boosts the intensity of the least saturated
colors the most
A This is the original image.
B To desaturate the color partially, we lowered the Saturation value for the Vibrance adjustment layer
to –60 and set the Vibrance to –50.
C This is the image after we applied the Vibrance
adjustment layer settings shown in the preceding figure.
D Here the image has the same Saturation value of –60 but
a higher Vibrance value of +100.
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To desaturate a color layer and restore color
selectively using Vibrance:
1 Click a layer or the Background in an RGB image.
2 On the Adjustments panel, click the Vibrance
button
3 Click the mask thumbnail on the adjustment
layer
4 Reduce the Saturation all the way to –100 A
5 Choose the Brush tool, and on the Options
bar, choose a Soft Round brush, Normal mode,
and an Opacity of 50% or less Choose black as
the Foreground color
6 Adjust the brush diameter, then apply strokes
where you want to restore the original
colors.B–C You can change the brush
opac-ity and diameter between strokes To restore
grayscale areas, press X and paint with white
C Now the color is visible only in the center of the image.
A To strip the color from this image, we lowered the Saturation value for a Vibrance adjustment layer to –100.
B We applied brush strokes to the adjustment layer mask
to restore color to the salad, where we want to draw the viewer’s attention.
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You can also use the Vibrance controls to adjust the
saturation of a full color layer To guard against
over-saturation and clipping, the Vibrance slider boosts
the intensity of less saturated colors more than that
of highly saturated colors For this reason, this slider
is useful for reviving skin tones The Saturation
slider, on the other hand, applies the same change
to all colors regardless of their original saturation
levels
To adjust the vibrance of a color layer:
1 Click a layer or the Background in an RGB
image.A
2 On the Adjustments panel, click the Vibrance
button
3 Do either of the following:
Increase the Vibrance value, then reduce the
Saturation value slightly.B
Reduce the Vibrance value, then increase the
Saturation value slightly.C
A The color in this portrait is oversaturated.
B For the Vibrance adjustment layer, we set the
Saturation value to –25 and the Vibrance value to +40
Now the color and the contrast are less intense.
C For a subtle variation, we set the Saturation value to +25 and the Vibrance value to –40 The colors are also less intense here, but the contrast is slightly stronger.