Rendering intents
Rendering intents
indicate what you want a printer to do with colors that are outside
its gamut.
ICC profiles support
these rendering intents:
- Perceptual
If an image includes any colors that
are out-of-gamut for the printer, the printer adjusts all the colors
in the image, even those that are already in the gamut of the printer,
so they are all in-gamut and maintain their color relationships to
each other. The result is an image that is visually pleasing, but
is not colorimetrically accurate. The perceptual rendering intent
is useful for general reproduction of images, particularly photographs.
- Saturation
If a print job includes colors that
are out-of-gamut for the printer, the printer replaces the out-of-gamut
color with the nearest color in the gamut. It also adjusts the in-gamut
colors so that they are more vivid. Saturation is the least used rendering
intent, but it is useful for business graphics, such as images that
contain charts or diagrams.
- Media-relative colorimetric
If a print job includes
colors that are out-of-gamut for the printer, the printer substitutes
the nearest in-gamut color; in-gamut colors are not adjusted. Colors
printed on papers with different media white points might not match
visually. The media white point is the color
of the paper that the print job is printed on. For example, if you
print an image on white paper, on off-white paper, and on blue paper
by using the media-relative colorimetric rendering intent, the printer
uses the same amount of ink or toner for each one and the resulting
color is technically the same. However, the images might seem different
because your eyes adjust to the color of the background and interpret
the color differently. This rendering intent is typically used for
vector graphics.
- Absolute colorimetric
All colors are mapped by
using the same method as the media-relative colorimetric rendering
intent, however, all colors are adjusted for the media white point.
For example, if you print an image on white paper, on off-white paper,
and on blue paper by using the absolute colorimetric rendering intent,
the printer adjusts the ink or toner used for each one. The resulting
color is technically not same, but the images might look the same
because of the way your eyes interpret them in relationship to the
color of the paper. The absolute colorimetric rendering intent is
typically used for logos.
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