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Opacity/Pressure/Exposure if you want
increasing pressure to result in more opaque paint
or a more intense effect.
Note: The highest pressure of your stylus may not
reach 100%. This problem is due to the driver soft-ware
and is not caused by the Adobe Photoshop
program. If you experience this problem, contact
your tablet vendor for more information.
Selecting a blending mode
You can control which pixels are affected by a
painting or editing tool by choosing a blending
mode in the tool’s Options palette. When using
blending modes, it’s helpful to think of the effects
in terms of the following three colors: The base color is the original color in the image. The blend color is the color being applied with
the painting or editing tool. The result color is the color resulting from the
blend.
The following sections describe each of the paint-ing
and editing modes. See the illustrations at the
end of the section for examples of each mode.
Normal Edits or paints each pixel to make it the
result color. This is the default mode. (Normal
mode is called Threshold when you’re working
with a bitmapped or indexed-color image.)
Dissolve Edits or paints each pixel to make it the
result color; however, the result color is a random
replacement of the pixels with the base color or the
blend color, depending on the opacity at any pixel
location. This mode works best with the paint-brush
or airbrush tool and a large brush.
Behind Edits or paints only on the transparent
part of a layer. This mode works only in layers that
contain transparency. When you apply paint, it
appears that you’re painting on the back of the
transparent areas in a sheet of acetate.
Clear Edits or paints each pixel and makes it trans-parent.
This mode is available for the line tool (l),
the paintbucket tool (t), the Fill command, and
the Stroke command. You must be in a layer to use
this mode.
Multiply Looks at the color information in each
channel and multiplies the base color by the blend
color. The result color is always a darker color.
Multiplying any color with black produces black.
Multiplying any color with white leaves the color
unchanged. When you’re painting with a color
other than black or white, successive strokes with a
painting tool produce progressively darker colors.
The effect is similar to drawing on the image with
multiple magic markers.
Screen Looks at each channel’s color information
and multiplies the inverse of the blend and base
colors. The result color is always a lighter color.
Screening with black leaves the color unchanged.
Screening with white produces white. The effect is
similar to painting over an area with bleach.
Overlay Multiplies or screens the colors, depend-ing
on the base color. Patterns or colors overlay the
existing pixels while preserving the highlights and
shadows of the base color. The base color is not
replaced but is mixed with the blend color to
reflect the lightness or darkness of the original
color.
209
Soft light Darkens or lightens the colors, depend-ing
on the blend color. The effect is similar to shin-ing
a diffused spotlight on the image.
If the blend color (light source) is lighter than
50% gray, the image is lightened, as if it were
dodged. If the blend color is darker than 50% gray,
the image is darkened, as if it were burned in.
Painting with pure black or white produces a dis-tinctly
darker or lighter area but does not result in
pure black or white.
Hard light Multiplies or screens the colors,
depending on the blend color. The effect is similar
to shining a harsh spotlight on the image.
If the blend color (light source) is lighter than
50% gray, the image is lightened, as if it were
screened. This is useful for adding highlights to an
image. If the blend color is darker than 50% gray,
the image is darkened, as if it were multiplied. This
is useful for adding shadows to an image. Painting
with pure black or white results in pure black or
white.
Color Dodge Looks at the color information in
each channel and brightens the base color to
reflect the blend color. Blending with black pro-duces
no change.
Color Burn Looks at the color information in each
channel and darkens the base color to reflect the
blend color. Blending with white produces no
change.
Darken Looks at the color information in each
channel and selects the base or blend color—
whichever is darker—as the result color. Pixels
lighter than the blend color are replaced, and
pixels darker than the blend color do not change.
Lighten Looks at the color information in each
channel and selects the base or blend color—
whichever is lighter—as the result color. Pixels
darker than the blend color are replaced, and pix-els
lighter than the blend color do not change.
Difference Looks at the color information in each
channel and subtracts either the blend color from
the base color or the base color from the blend
color, depending on which has the greater bright-ness
value.
Exclusion Creates an effect similar to but softer
than the Difference mode. Blending with white
inverts the base color values. Blending with black
produces no change.
Hue Creates a result color with the luminance and
saturation of the base color and the hue of the
blend color.
Saturation Creates a result color with the lumi-nance
and hue of the base color and the saturation
of the blend color. If you paint with this mode in
an area with a saturation of zero (gray), there is no
change.
Color Creates a result color with the luminance of
the base color and the hue and saturation of the
blend color. This preserves the gray levels in the
image and is useful for coloring monochrome
images and for tinting color images.
Luminosity Creates a result color with the hue and
saturation of the base color and the luminance of
the blend color. This mode creates an inverse effect
from that of the Color mode.
CHAPTER 9 210
Painting
BLENDING MODES AND OPACITY The blending modes let you
control how pixels in an image are affected by a painting
or editing tool. Using different combinations of modes
and opacity, you can produce a variety of effects. For
a description of
each mode, see “Selecting a blending mode” on page 208.
Normal
Darken
Screen
Hue
Normal, 70% opacity
Lighten
Overlay
Color
Dissolve
Difference
Soft light
Luminosity
Multiply
Hard light
Exclusion
Background
Brush stroke
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