Cyan, magenta and yellow pigment-based ink compositions for ink jet printing are described; wherein the ink compositions each comprise a pigment, water, water miscible humectants and/or water-miscible organic co-solvents, surfactants, or mixtures thereof; wherein the normalized differential specular reflectance, N&Dgr;R
S
(X), for the cyan, magenta and yellow inks is less than 1.25, 0.50 and 0.30, respectively. N&Dgr;R
S
(X) is defined as the maximum value within a set of N&Dgr;R
S
(Xn) values in which each N&Dgr;R
S
(Xn) is the normalized specular reflectance for a density patch of a printed test image. The printed test image consists of a series of at least ten density patches printed such that the ink laydown on the patches increases incrementally, from no ink laydown to a maximum level generating a density of at least 1.5; and wherein N&Dgr;R
S
(Xn) for each patch is determined according to:
1
N
⁢
⁢
Δ
⁢
⁢
R
S
⁡
(
X
⁢
⁢
n
)
=
[
R
S
⁢
⁢
max
⁡
(
X
⁢
⁢
n
)
-
R
S
⁢
⁢
min
⁡
(
X
⁢
⁢
n
)
]
R
S
⁢
⁢
mean
⁡
(
X
⁢
⁢
n
)
where, over the visible spectral region between 390 nm and 720 nm for patch Xn, R
Smax
(Xn) is the maximum, R
Smin
(Xn) is the minimum, and R
Smean
(Xn) is the average specular reflectance.
描述了用于喷墨打印的青色、品红色和黄色
颜料型油墨组合物;其中,油墨组合物各自包含
颜料、
水、
水溶性保湿剂和/或
水混溶有机助溶剂、表面活性剂或其混合物;其中,归一化微分镜面反射率 N&Dgr;R
S
(X) 分别小于 1.25、0.50 和 0.30。N&Dgr;R
S
(X) 被定义为一组 N&Dgr;R;S(X)中的最大值。
S
(Xn) 值中的最大值,其中每个 N&Dgr;R
S
(Xn) 是印刷测试图像的密度斑块的归一化镜面反射率。打印的测试图像由一系列至少十个密度斑块组成,这些斑块上的油墨层叠逐渐增加,从无油墨层叠到产生至少 1.5 密度的最大
水平;其中 N&Dgr;R
S
(Xn)是根据以下条件确定的:
1
N
⁢
⁢
Δ
Δ
⁢
R
S
⁡
(
X
⁢
⁢
n
)
=
[
R
S
⁢
⁢
max
⁡
(
X
⁢
n
n
)
-
R
S
⁢
⁢
min
⁡
(
X
⁢
n
n
)
]
R
S
⁢
⁢
平均值
⁡
(
X
⁢
n
n
)
其中,对于贴片 Xn,在 390 纳米到 720 纳米之间的可见光谱区域,R
Smax
(Xn) 为最大值,R
Smin
(Xn) 为最小值,R
Smean
(Xn) 是平均镜面反射率。