CHAPTER 8
138
Painting
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.
Specifying opacity, strength, exposure, or
flow
You can specify opacity, pressure, flow, tolerance,
or exposure for a variety of tools:
• Opacity is used by the gradient, pencil, eraser,
magic eraser, brush, clone stamp, pattern
stamp, paint bucket, and impressionist brush
tools.
• Strength of stroke is used by the smudge, blur,
and sharpen tools.
• Amount of exposure is used by the dodge and
burn tools.
• Flow is used by the sponge tool to set the rate of
saturation change.
• Tolerance is used by the background eraser,
impressionist bush, paint bucket, magic wand,
and the red eye brush tools. The tolerance
percentage defines how similar in color a pixel
must be to be affected by the tool. A low
tolerance value affects pixels within a range of
color values very similar to the pixel you click. A
high tolerance affects pixels within a broader
range of color values.
To specify opacity, pressure, exposure, tolerance, or
flow:
In the options bar, enter a value, or drag the pop-
up slider for Opacity, Pressure, Exposure,
Tolerance, or Flow.
The value can range from 1% to 100%. For trans-
parent paint or a weak effect, specify a low
percentage value; for more opaque paint or a
strong effect, specify a high value.
Specifying brush dynamics
If you don’t have a stylus or art tablet, you can still
simulate actual brush strokes by setting the rates at
which the brush tool strokes fade out. You can
specify which options dynamically change over the
course of a brush stroke including stroke
scattering, size, and color. The brush thumbnail in
the options bar reflects the brush changes as you
adjust the brush dynamics options.
To set brush dynamics:
1 Select the brush tool in the toolbox.
2 Click the More Options button in the
options bar.
3 Set any of the following options:
Spacing Controls the distance between the brush
marks in a stroke. To change the spacing, type a
number, or use the slider to enter a value that is a
percentage of the brush diameter. (The brush
thumbnail in the options bar dynamically changes
to reflect your spacing adjustments.)
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