Using Help
|
Contents
|
Index
Back
111
Adobe Photoshop Help
Producing Consistent Color (Photoshop)
Using Help
|
Contents
|
Index
Back
111
The following rendering intent options are available.
Perceptual
Known as the Image intent in Adobe PageMaker and Illustrator 8, Perceptual
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. This intent is
most suitable for photographic images.
Saturation
Known as the Graphics intent in Adobe PageMaker and Illustrator 8,
Saturation 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.
Relative Colorimetric
This intent is identical to Absolute Colorimetric except for the
following difference: Relative Colorimetric compares the white point of the source color
space to that of the destination color space and shifts all colors accordingly. Although the
perceptual rendering intent has traditionally been the most common choice for photo-
graphic imagery, Relative Colorimetric —with the Use Black Point Compensation option
selected in the Color Settings dialog box—can be a better choice for preserving color
relationships without sacrificing color accuracy. Relative Colorimetric is the default
rendering intent used by all predefined configurations in the Settings menu of the Color
Settings dialog box.
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. Absolute Colori-
metric can be more accurate if the image’s color profile contains correct
white point
(extreme highlight) information.
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 selected,
the full dynamic range of the source space is mapped into the full dynamic range of the
destination space. When deselected, 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 darker than that of the destination
space.
The Use Black Point Compensation option is selected for all predefined configurations in
the Settings menu of the Color Settings dialog box. It is highly recommended that you
keep this option selected.
Using dither
The Use Dither (8-bit/channel images) option controls whether to dither colors when
converting 8-bit-per-channel images between color spaces. When this option is selected,
Photoshop mixes colors in the destination color space to simulate a missing color that
existed in the source space. Although dithering helps to reduce the blocky or banded
appearance of an image, it may also result in larger file sizes when images are compressed
for Web use.