Adobe 13101332 - Photoshop - Mac User Manual page 243

Adobe Photoshop Help
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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 brightness value. Blending with white inverts the base color values; blending
with black produces no change.
Exclusion Creates an effect similar to but lower in contrast 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 luminance and hue of the base color and the
saturation of the blend color. Painting with this mode in an area with no (0) saturation
(gray) causes 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.
Specifying opacity, flow, strength, or exposure
You can specify opacity, flow, strength, or exposure for the following tools:
Opacity specifies the maximum amount of paint coverage applied by the brush, paint-
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brush, pencil, clone stamp, pattern stamp, history brush, art history brush, gradient,
and paint bucket tools.
Flow specifies how quickly paint is applied by the brush tool.
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Strength specifies the strength of strokes applied by the smudge, blur, sharpen, and
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sponge tools.
Exposure specifies the amount of exposure used by the dodge and burn tools.
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To specify opacity, flow, strength, or exposure:
Enter a value, or drag the slider for Opacity, Flow, Strength, or Exposure in the options bar.
Opacity, flow, strength, or exposure can range from 1% to 100%. For transparent paint or a
weak effect, specify a low percentage value; for more opaque paint or a strong effect,
specify a high value.
Press a number key to set a tool's opacity, flow, strength, or exposure in multiples of
10% (pressing 1 sets to 10%, pressing 0 sets to 100%).
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