Adobe illustrator 10 Manuale Utente
|
Back
Adobe Illustrator Help
Producing Consistent Color
|
Back
Specifying a rendering intent
Translating colors to a different color space usually involves an adjustment of the colors to
accommodate the gamut of the destination color space. Different translation methods use
different rules to determine how the source colors are adjusted; for example, colors that
fall inside the destination gamut may remain unchanged, or they may be adjusted to
preserve the original range of visual relationships as translated to a smaller destination
gamut. These translation methods are known as rendering intents because each technique
is optimized for a different intended use of color graphics.
accommodate the gamut of the destination color space. Different translation methods use
different rules to determine how the source colors are adjusted; for example, colors that
fall inside the destination gamut may remain unchanged, or they may be adjusted to
preserve the original range of visual relationships as translated to a smaller destination
gamut. These translation methods are known as rendering intents because each technique
is optimized for a different intended use of color graphics.
Note: The result of choosing a rendering intent depends on the graphical content of
documents and on the profiles used to specify color spaces. Some profiles produce
identical results for different rendering intents. Differences between rendering intents are
apparent only when you print a document or convert it to a different working space.
documents and on the profiles used to specify color spaces. Some profiles produce
identical results for different rendering intents. Differences between rendering intents are
apparent only when you print a document or convert it to a different working space.
The following rendering intent options are available:
Perceptual This intent aims to preserve the visual relationship between colors in a way
that is perceived as natural to the human eye, although the color values themselves may
change.
that is perceived as natural to the human eye, although the color values themselves may
change.
Saturation Appropriate for office and presentation graphics, this intent aims to create
vivid color at the expense of accurate color. It scales the source gamut to the destination
gamut but preserves relative saturation instead of hue, so when scaling to a smaller
gamut, hues may shift. This rendering intent is suitable for business graphics, where the
exact relationship between colors is not as important as having bright saturated colors.
vivid color at the expense of accurate color. It scales the source gamut to the destination
gamut but preserves relative saturation instead of hue, so when scaling to a smaller
gamut, hues may shift. This rendering intent is suitable for business graphics, where the
exact relationship between colors is not as important as having bright saturated colors.
Absolute Colorimetric Leaves colors that fall inside the destination gamut unchanged.
This intent aims to maintain color accuracy at the expense of preserving relationships
between colors. When translating to a smaller gamut, two colors that are distinct in the
source space may be mapped to the same color in the destination space.
This intent aims to maintain color accuracy at the expense of preserving relationships
between colors. When translating to a smaller gamut, two colors that are distinct in the
source space may be mapped to the same color in the destination space.
Relative Colorimetric This intent is identical to absolute colorimetric except for the
following difference: relative colorimetric compares the white point (extreme highlight) of
the source color space to that of the destination color space and shifts all colors accord-
ingly. Relative colorimetric can be more accurate if the image’s profile contains correct
white point information. This is the default rendering intent used by all predefined color
management configurations.
following difference: relative colorimetric compares the white point (extreme highlight) of
the source color space to that of the destination color space and shifts all colors accord-
ingly. Relative colorimetric can be more accurate if the image’s profile contains correct
white point information. This is the default rendering intent used by all predefined color
management configurations.
Using black-point compensation
The Use Black Point Compensation option controls whether to adjust for differences in
black points when converting colors between color spaces. When this option is enabled,
the full dynamic range of the source space is mapped into the full dynamic range of the
destination space. When disabled, the dynamic range of the source space is simulated in
the destination space; although this mode can result in blocked or gray shadows, it can be
useful when the black point of the source space is lower than that of the destination
space.
black points when converting colors between color spaces. When this option is enabled,
the full dynamic range of the source space is mapped into the full dynamic range of the
destination space. When disabled, the dynamic range of the source space is simulated in
the destination space; although this mode can result in blocked or gray shadows, it can be
useful when the black point of the source space is lower than that of the destination
space.
The Use Black Point Compensation option is selected for all predefined color management
configurations. It is highly recommended that you keep this option selected.
configurations. It is highly recommended that you keep this option selected.