2.3 Principles of colour matching of dyed textiles
A colour match between two sets of samples means:
Colour of produced sample = Colour of given standard sample i.e. (X
SL,
Y
SL,
Z
SL
)
values of produced sample = (X
SD,
Y
SD,
Z
SD
) values of given standard sample while
X,Y & Z are the tristimulus value of produced Sample (SL) and Standard (SD)
sample Also match may be predicted or judged [1–3] by (Reflectance)
SL
of pro-
duced sample integrated at 400 to700 nm = (Reflectance)
SD
of standard sample
integrated at 400 to 700 nm or (K/S)
SL
values of produced sample = (K/S)
SD
value
of standard sample, where K/S = α C
D
and K/S values (as per kubelka munk
Equation [1–3]) as stated above), is:
K=S ¼
Co
‐efficient of absorption
Co
‐efficient of scattering
¼
1
R
λ
max
ð
Þ
2
2R
λ
max
¼ αC
D
(15)
For a ternary mixture of colourants/dyes to obtain any particular compound
shade on textiles, three equations are to be solved as a function of dye concentra-
tions of the colourants (1,2,3 or n) and have to determine tristimulus values or K/S
Values obtained through reflectance measurement of samples to match. More over
K/S value being additive and dye concentration vs. K/S being linear in nature, the
resultant K/S value of a dyed sample (dyed with mixture of three different dyes
(d
1
, d
2
and d
3
) in respective concentrations (c
1
, c
2
and c
3
) is represented by
following matrix equations:
f
x
c
1
;
c
2
;
c
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