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Chapter 12: Using Filters
he filters that are built into Adobe
Photoshop let you apply special effects to
your images. For example, you can apply an
impressionistic or mosaic effect, add or reduce
noise (pixels with randomly distributed color val-ues),
apply lighting effects, distort images, and
produce many other interesting visual effects. You
can also create your own effects using the Custom
filter or the Filter Factory (included on the Adobe
Photoshop CD-ROM), and then save and reuse
these unique filters for other images. For more
information about the Custom filter, see “Using
the Custom filter” on page 287. For more detailed
information on individual filters, see online help.
About plug-in filters
Adobe Photoshop also supports plug-in filters
developed by non-Adobe software developers. For
information on installing these plug-in modules,
see “Using plug-in modules” on page 31. Once
installed, plug-in filters appear in the Filter menu
and work the same as built-in filters. If you are
interested in creating Adobe Photoshop-compati-ble
plug-in modules, please contact Adobe Sys-tems
Developer Support.
Previewing and applying filters
To use a filter, choose the appropriate submenu
command from the Filter menu. The last filter
chosen appears at the top of the menu.
Note: Filters cannot be applied to Bitmap-mode,
indexed-color, 48-bit RGB, or 16-bit grayscale
images.
Some Photoshop filters let you preview a filter
effect on the active layer before applying the filter.
Because applying a filter—especially to large
images—can be time-consuming, use the Preview
option to save time and prevent unintended
results. Several filter dialog boxes also have a built-in
preview box that shows the filter’s effect on the
active layer.
To preview and apply a filter:
1 To apply a filter to an area of a layer, select that
area. To apply a filter to the entire layer, leave the
image unselected.
2 Choose a filter from the submenus in the
Filter menu. If a filter name has ellipses, a dialog
box appears.
T
CHAPTER 12 280
Using Filters
3 If a dialog box appears, enter values or select
options.
4 To preview the effect using the filter’s preview
box, use the following navigation methods: Drag in the image window to center a specific
area of the image in the preview box. To see part of the layer that is not visible, move
the cursor inside the preview box to activate the
hand tool. Drag to move the layer preview. Use the + or – button under the preview box to
zoom in or zoom out on the preview.
A flashing line beneath the preview size indicates
that Adobe Photoshop is still rendering the pre-view.
5 If the Preview option is available, select the
option to preview the filter effect on the image.
6 Click OK to apply the filter.
When a filter takes a while to be applied, Adobe
Photoshop displays a progress bar (Macintosh) or
progress indicator in the status bar (Windows) so
that you can gauge the time remaining until the fil-ter
is applied.
See the various examples of filter effects in this
chapter.
Blending filter effects
The Filter > Fade command fades the effect of a fil-ter
or of a color adjustment (the Image > Adjust
commands). You choose a blending opacity and a
mode, which determines how the modified pixels
in the selection appear in relation to the original
pixels. The blending modes in the Fade dialog box
are a subset of those available in the painting and
editing tools Options palette (the Behind and
Clear blending modes are not available in the Fade
dialog box). For more information about color
adjustment commands, see Chapter 6, “Making
Color and Tonal Adjustments.”
Click + to zoom in or –
to zoom out on image
in preview box
Click and drag to move
image in preview box
281
Applying the Filter > Fade command is similar to
applying the filter effect on a separate layer and
then using the layer opacity and blending mode
controls. (For more information, see “Using
adjustment layers” on page 267).
Original Note paper filter applied
Screen mode applied
using Fade command
To fade a filter effect or color adjustment:
1 Apply a filter or an Image > Adjust command to
an image or selection.
2 With the affected area still selected, choose Filter
> Fade.
3 Select the Preview option to preview the effect.
4 Drag the slider to adjust the opacity, from 0
(transparent) to 100%. For more information, see
“Specifying the opacity, pressure, or exposure” on
page 206.
5 For Mode, choose a blending mode. For more
information on opacity and blending modes, see
“Selecting a blending mode” on page 208.
Note: The Color Dodge, Color Burn, Lighten,
Darken, Difference, and Exclusion modes do not
work on Lab images.
6 Click OK. Then deselect the selection to merge
its pixels with the image.
Undoing the Fade command also cancels the filter
effect or color adjustment, even if you have applied
the Fade command several times in succession.
Using filter shortcuts
These techniques can help save time when work-ing
with filters: To cancel a filter as it is being applied,
press Command-period (Macintosh) or
Esc (Windows). To undo a filter, press Command+Z (Macin-tosh)
or Ctrl+Z (Windows). The Undo command
also undoes an application of the Fade command;
for more information, see “Blending filter effects”
on page 280. To reapply the most recently used filter with its
last values, press Command+F (Macintosh) or
Ctrl+F (Windows). To display the dialog box for the last filter you
applied, press Command+Option+F (Macintosh)
or Ctrl+Alt+F (Windows).
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