Since each adjustment layer has its own opacity settings, multiple adjustment layers can be fine-tuned to create a custom effect on the image.. Using Blending Modes and Opacity with La
Trang 1148 Chapter 7
Adjustment layers perform two functions—they adjust the image and they give you control Since an adjustment is held in a separate layer, you have the advantage of isolating the adjustment and keeping your original image information intact Combine that with an adjustment layer's ability to manipulate pixel information and you have a very pow-erful image-editing tool Blending Modes change how two or more layers interact For example, the Multiply blending mode instructs Photoshop to mix the pixels of two or more layers, thus creating an entirely new image from the mix With that in mind, the five modes that produce the most stunning results are Multiply, Screen, Hard Mix, Difference, and Exclusion The opacity of an adjustment layer controls the intensity of the selected adjustment You can reduce the opacity of the Hue & Saturation adjustment to 50% and it would reduce its effect
on the image Since each adjustment layer has its own opacity settings, multiple adjustment layers can be fine-tuned to create a custom effect
on the image
Using Blending
Modes and Opacity
with Layers
Use Blending Modes with
Adjustment Layers
Select the Layers panel.
Click the layer you want to adjust
Click the Blending Mode list
arrow, and then select from the
available options
The results of the blend are visible
in the document window
3
2
1
3
Blending Mode change applied to image
From the Library of Wow! eBook
Trang 2Control Through Opacity
Select the Layers panel.
Select the layers you want to
adjust
You can apply opacity to one or
more (New !) selected layers in
the Layers panel
Click the Opacity list arrow, and
then drag the slider to lower the
opacity of the layer
The results of the change appear
in the document window
TIMESAVER Click inside the
Opacity box, and then use the Up
and Down Arrow keys to increase
or decrease the opacity 1
percentage point at a time Hold
the Shift key, and then use the Up
and Down Arrow keys to increase
or decrease the opacity 10
percentage points at a time You
can also select the percentage in
the box and enter a value
3
2
2
3
The effect of lowering the opacity of the layer by 50%
mutes the adjustment layer.
Trang 3150 Chapter 7
When you create an adjustment layer, the effects of the adjustment are applied to the entire image For example, if you use the Curves adjust-ment, the resulting changes are applied to the entire image It's true you can modify the adjustment with the use of layer blending modes and opacity settings but the effects are applied equally to the entire image The problem is that many times you don't want the adjustment applied to the entire image For example, you may want to color-correct just a portion of the image, or lighten the shadows of an image without applying the same lightening adjustment to the highlights Photoshop handles this problem with the use of masks When you create an adjustment layer, Photoshop automatically creates a mask with the image The mask controls how the adjustment is applied to the image, and you control the effect by painting in the mask with black, white, or
a shade of gray When you paint in the mask with black, it will totally mask the adjustment; painting with white fully applies the adjustment If you paint with 50% gray, then the adjustment is applied to the image at 50% strength
Using Masks with
Adjustment Layers
Paint on an Adjustment Mask
Select the Layers panel.
Click the layer mask thumbnail in
which you want to paint a mask
Select a Paintbrush tool.
Select a brush size on the Options
bar
Select the Masks panel to display
details about both pixel and vector
masks and select from options to
change the opacity (density) of the
mask, as well as feather options
You can also access the Color
Range command from here and
invert the mask
Set the Foreground Color box on
the toolbox to black as the paint
color
Paint the areas of the image that
you want to mask The adjustment
layer must be selected The areas
painted black mask the adjustment,
returning the image to normal
To restore the masked areas,
switch to white and drag across
the image in the areas previously
painted black
8
7
6
5
4
3
2
From the Library of Wow! eBook
Trang 4You can create an instant mask using traditional selection techniques
Before creating the adjustment layer, select the area of the image to which you want the adjustment applied Use any of Photoshop's selec-tion tools for this purpose When you create the adjustment layer, Photoshop converts the selection into a mask, and only the selected areas of the image are changed
Creating Masks with
Selections
Create Masks with Selections
Use any of Photoshop's selection
tools to create a selection around
the area of the image to which you
want the adjustment applied
Select the Layers panel.
Click the Create New Fill or
Adjustment Layer button, and then
select from the available
adjustments or use the new
Adjustments panel to choose one
of the adjustment icons
Photoshop creates a mask based
on your selection with the
selected areas being adjusted and
the non-selected areas masked
3
2
1
1
3
2
Did You Know?
You can use any of Photoshop's filters
on an adjustment layer mask
For example, you could use the
Gaussian Blur filter to soften the edge
between adjustment and mask
Experiment with different filters for
different creative effects
Trang 5152 Chapter 7
The Add Noise filter applies random pixels to an image When you want
to simulate a film grain effect, you can apply the Add Noise filter For example, you could use the Add Noise filter to make an image look like
it was taken using high-speed film In addition, the Add Noise filter can
be used to reduce banding in feathered selections or graduated fills or even give a more realistic look to heavily retouched areas Experiment with the Add Noise filter in combination with other filters, such as Motion Blur filters, to create eye-catching special effects
Using the Add
Noise Filter
Use the Add Noise Filter
Select the Layers panel.
Select the layer to which you want
to apply the Add Noise filter
Click the Filter menu, point to
Noise, and then click Add Noise.
Select from the following options:
◆ Amount Drag the slider, or
enter a value (0.10 to 400) to
increase or decrease the
amount of noise added to the
image
◆ Distribution Click the Uniform
option to create a more ordered
appearance, or click the
Gaussian option to create a
more random noise pattern
◆ Monochromatic Select this
check box to apply the filter to
the tonal elements in the image
without changing the colors
TIMESAVER The plus and
minus signs, located directly under
the image preview, let you
increase or decrease the viewable
area of the image
Click OK.
5
4
3
2
1
5
4
Using Filters to Retouch an Image
One of Photoshop's most powerful features is its ability to recreate a
photographic image Photographers use the term photographic restoration to describe image retouching Photo restoration
describes the process of returning an image to its original state For example, you could remove dust and scratches from an old image using the Dust and Scratches filter, or repair other problems associ-ated with old or damaged images using Photoshop filters Since the same tools and filters can be used to restore an image as you have been using to apply effects to your images, you can experiment with various filters to find out which ones will help you with your image restoration
For Your Information
From the Library of Wow! eBook
Trang 6The Reduce Noise filter helps to remove the random noise that crops
up in digital images It's called noise, but in reality it is a pattern of dis-tracting color or grayscale information on top of the original image information Noise can be generated by the Add Noise filter, but it typi-cally comes from scanners and even digital cameras Since there is a mathematical pattern to most noise, the Reduce Noise filter is designed
to seek out and reduce the amount of noise in an image The Reduce Noise filter works on individual layers, not the entire document After applying the filter, you can use other restoration tools, such as the Healing Brush and Patch tool, to further clean up problem areas in your image
Using the Reduce
Noise Filter
Use the Reduce Noise Filter
Click the Filter menu, point to Noise,
and then click Reduce Noise.
Select the Preview check box to
view the changes to the image
Select the Basic or Advanced
option Advanced allows you to
adjust the noise on individual
channels
Select from the following options:
◆ Settings Click the setting arrow
and select a user-defined preset
◆ Strength Drag the slider to
determine how strong to apply
the Reduce Noise filter
◆ Preserve Details Drag the slider
to determine a balance between
blurring the noise and preserving
details
◆ Reduce Color Noise Drag the
slider to convert noise composed
of colors into shades of gray (this
may desaturate other areas of
the image)
◆ Sharpen Details Drag the slider
to determine where the details of
the image exist, in terms of shifts
in brightness
◆ Remove JPEG Artifact Check to
help remove artifacts (typically
noise within shadows) from
severely compressed JPEG
images
Click OK.
5
4
3
2
1
5
3
4
Noise filter applied
to the image
Trang 7154 Chapter 7
Vanishing Point gives you the ability to move and/or copy objects and still maintain the same visual perspective of the original Let's say that you shoot an image of a roadway disappearing into the distance, and along the road there's a billboard You want the billboard to appear as if it's farther away, but to retain its proper perspective within the image
With Vanishing Point, you simply create a framework, or plane, that identifies the depth of the image, and then move the billboard (using the Move or Clone Stamp tools) Wherever you move the sign, it will appear within the proper perspective If you have Photoshop Extended, you can adjust the angle of the plane for greater flexibility or take measure-ments When you finish working in Vanishing Point, you can use the Vanishing Point menu to render grids to Photoshop With Photoshop Extended, you can also export 3D information and measurements to DXF or 3DS formats
Keeping Proper
Perspective with
Vanishing Point
Use the Vanishing Point Tool
Open an image
Click the Filter menu, and then
click Vanishing Point.
The following tools are available:
◆ Edit Plane Adjusts the grid to
match the perspective of the
image
◆ Create Plane First tool to use;
it creates the initial perspective
grid plane
◆ Marquee Tool Makes
selections in the grid and then
changes their perspective as
you move them to match the
perspective of the grid
◆ Stamp Tool Lets you make
copies of areas and then stamp
them onto other areas using the
perspective of the grid
◆ Brush Tool Lets you paint with
color within the grid If you
click the Heal button and then
click Luminance, Vanishing
Point adapts the color to the
shadows or textures of the
areas being painted
◆ Transform Tool Lets you rotate,
resize or flip a selection
created with the Marquee tool
◆ Eyedropper Tool Click to select
a specific color from the image
3
2
1
Edit Plane
Marquee
Brush
Eyedropper
Hand
Create Plane Stamp
Transform
Measure
1
Zoom
Vanishing Point
From the Library of Wow! eBook
Trang 8◆ Measure Tool Lets you draw a
measurement line over an
object in a perspective plane
(Extended)
◆ Hand Tool Click to move the
image within the Vanishing
Point window
◆ Zoom Tool Click to Zoom in, or
Alt+click (Win) or Option+click
(Mac) to zoom out
Select the Create Plane tool.
Click on the image to create the
first point of the grid, and then
click three more times to create
the box shape of the grid
◆ Angle Lets you adjust the
plane angle (Extended)
Use the Edit Plane tool to change
the perspective of the plane, and
to extend the plane over the area
you want fixed
The grid should be blue; however,
if the grid turns red or yellow, that
means Vanishing Point believes
you have a bad grid
Select the Zoom tool, and zoom in
on the working areas of the image
Select the Stamp tool.
Position the Stamp tool directly
over the image area you want to
use to fix the offending portions of
the image, and then Alt+click
(Win) or Option+click (Mac) to
confirm the selection
Move to the area you want to fix
and then click and drag with the
Stamp tool, which replaces the
original information; the
perspec-tive changes to match the grid
To show the grid in Photoshop,
click the Vanishing Point menu,
and then click Render Grids To
Photoshop.
Click OK.
12
11
10
9
8
7
6
5
4
5
6
9
10
7
Edit Plane
8 4