Applying Special Color Effects To Images - Adobe PHOTOSHOP ELEMENTS 2 User Manual

CHAPTER 10
186
Applying Filters, Effects, and Layer Styles
Minimum and Maximum
the effect of applying a spread—spreading out
black areas and shrinking white areas. The
Maximum filter has the effect of applying a
choke—spreading out white areas and choking in
black areas. Like the Median filter, the Maximum
and Minimum filters look at individual pixels in a
selection. Within a specified radius, the Maximum
and Minimum filters replace the current pixel's
brightness value with the greatest or least
brightness value of the surrounding pixels.
Moves a selection a specified amount to the
Offset
right horizontally or down vertically, leaving an
empty space at the selection's original location.
Depending on the size of the selection, you can fill
the empty area with a transparent background,
with the edge pixels, or with pixels from the right
or bottom edges of an image. (See "Defining
undistorted areas" on page 167.)
About plug-in filters
You can install plug-in filters developed by non-
Adobe software developers. Once installed, the
plug-in filters appear at the bottom of the Filter
menu unless the developer has specified another
location. For previews to appear in the Filters
palette, plug-in filters must be specially designed
for Photoshop Elements.
If you are interested in creating plug-in modules,
contact Adobe Systems Developer Support.
(See "Using plug-in modules" on page 35.)
Note: If you have problems or questions about a
third-party plug-in, contact the plug-in's manufac-
turer for support.
The Minimum filter has Applying special color effects to
images
The Invert, Equalize, Threshold, and Posterize
commands change colors or brightness values in
an image but are typically used for enhancing
color and producing special effects, rather than for
correcting color.
Using the Invert command
The Invert command inverts the colors in an
image. You might use this command to make a
positive black-and-white image negative or to
make a positive from a scanned black-and-white
negative.
Note: Because color print film contains an orange
mask in its base, the Invert command cannot make
accurate positive images from scanned color
negatives. Be sure to use the proper settings for color
negatives when scanning film on slide scanners.
When you invert an image, the brightness value of
each pixel in the channels is converted to the
inverse value on the 256-step color-values scale.
For example, a pixel in a positive image with a
value of 255 is changed to 0, and a pixel with a
value of 5 is changed to 250.
To use the Invert command:
Do one of the following:
Choose Image > Adjustments > Invert.
•
Create an Invert adjustment layer. (See "Using
•
adjustment and fill layers" on page 101.)