EP0840500A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Device-independent trapping
Assignee: Adobe Inc
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Filing: 1997-10-20
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Granted: —
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Expires: 2017-10-20
Abstract
Abstract A computer-implemented method traps an edge in a color page described by page data, independently of the output device. The method comprises identifying, based on page data for a color page, an edge and first and second adjacent regions having the edge as a common boundary. defining a clip region, including the edge and at least part of one of the first and the second regions, and generating and storing device-independent trap data representing the clip region for use by an unspecified output device for trapping the edge. A page trapped by the method for output on an unspecified output device includes trap data for at least one edge represented in the page, the trap data for each edge comprising edge data, defining the edge, adjacent region data, describing a first and a second adjacent region sharing the edge as a common boundary, and clip region data, defining a clip region including the edge and at least part of the first or the second adjacent regions.
Inventors
- 👤 Richard G. Rocheleau
- 👤 John P. Felleman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:18
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/58; G; G06; G06K; G06K15/00; G06K15/02; G06K15/18; G06K15/1801; G06K15/1825; G06K15/1826
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
A computer-implemented method for device-independent
trapping of an edge in a color page described
by page data, the method comprising: identifying, based on page data for a color page,
an edge and first and second adjacent regions having the
edge as a common boundary; defining a clip region, including the edge and at
least part of one of the first and the second regions;
and generating and storing device-independent trap
data representing the clip region for use by an
unspecified output device for trapping the edge.
Claim 2
Dependent Claim
72 words
The method of claim 1 wherein the first
adjacent region has a first color and the second adjacent
region has a second color, the method further comprising: designating one of the first and the second colors
as a dominant color; and designating the adjacent region having the
dominant color as a dominant region, wherein the clip
region is defined to include the edge and at least part
of the designated dominant region.
Claim 3
Dependent Claim
43 words
The method of claim 2, wherein designation of
a dominant color further comprises determining a neutral
density of the first color and a neutral density of the
second color, wherein the color having the higher neutral
density is designated as the dominant color.
Claim 4
Dependent Claim
32 words
The method of claim 2 wherein the first
adjacent region has a first color and the second adjacent
region has no color, and the first region is designated
as the dominant region.
Claim 5
Dependent Claim
63 words
The method of claim 1 wherein the first
adjacent region has a first color and the second adjacent
region has a second color, the method further comprising
determining a parameter measuring the similarity of the
first color and the second color, wherein if the
parameter exceeds a predetermined threshold, the clip
region is not defined and trap data is not generated or
stored.
Claim 6
Dependent Claim
87 words
The method of claim 1 wherein the first
adjacent region has a first color and the second adjacent
region has no color, the method further comprising: determining whether the first color is comprised
of a first color component having a high neutral density
and a second color component having a low neutral
density, wherein if the difference between the neutral
densities of the first and second color components falls
below a predetermined threshold, the clip region is not
defined and trap data is not generated or stored.
Claim 7
Dependent Claim
103 words
A computer-implemented method for determining
a trap region for an edge in a color page described by
page data and trap data for an output device, the method
comprising: identifying, based on page data and trap data for
a color page, an edge defining a common boundary for a
first and a second adjacent region, and a clip region
including the edge and at least part of one of the first
and the second adjacent regions; defining a stroke region, including the edge, for
an output device; and defining a trap region comprising the intersection
of the clip region and the stroke region.
Claim 8
Dependent Claim
104 words
The method of claim 7 wherein the first
adjacent region has a first color and the second region
has a second color, the first and second colors being
defined in a page color space, the method further
comprising: converting the first color and the second color
from the page color space to a device color space of the
output device; determining color separations for the first and
second adjacent regions for the output device, based on
the first and the second colors defined in the device
color space; and determining, based on the color separations,
whether to determine a trap region for the edge.
Claim 9
Dependent Claim
83 words
The method of claim 7 wherein the first
adjacent region has a first color and the second region
has a second color, the first and second colors being
defined in a page color space, the method further
comprising: converting the first color and the second color
from the page color space to a device color space of the
output device; and determining a trap color for the trap region based
on the first and the second colors defined in the device
color space.
Claim 10
Dependent Claim
23 words
The method of claim 9, wherein the trap color
is determined based on a predetermined function of the
first and the second colors.
Claim 11
Dependent Claim
28 words
The method of claim 9, wherein the trap color
is determined based on whether the trap region falls
within the first adjacent region or the second adjacent
region.
Claim 12
Dependent Claim
58 words
The method of claim 9, wherein a part of the
trap region falls within the first adjacent region and a
part of the trap region falls within the second adjacent
region, and the trap color of the trap region is
separately determined for the parts of the trap region
falling within the first and the second adjacent regions.
Claim 13
Dependent Claim
76 words
A page for output on an unspecified output
device, the page including trap data for at least one
edge represented in the page, the trap data for each edge
comprising: edge data, defining the edge; adjacent region data, describing a first and a
second adjacent region sharing the edge as a common
boundary; and clip region data, defining a clip region including
the edge and at least part of the first or the second
adjacent regions.
References Cited (Backward Citations)
No citation records indexed.
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