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Mike Bostock
Visualization toolmaker. Founder @observablehq. Creator @d3. Former @nytgraphics. Pronounced BOSS-tock.
Workspace
Fork
Published
Color
By
Mike Bostock
Edited
Aug 20, 2019
15 stars
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color_rgb
=
[
parseInt
(
color
.
slice
(
1
,
3
)
,
16
)
/
255
,
parseInt
(
color
.
slice
(
3
,
5
)
,
16
)
/
255
,
parseInt
(
color
.
slice
(
5
,
7
)
,
16
)
/
255
]
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color_lrgb
=
rgb_lrgb
(
color_rgb
)
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color_xyzd50
=
lrgb_xyzd50
(
color_lrgb
)
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xn
=
tristimulus_d50
[
0
]
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yn
=
tristimulus_d50
[
1
]
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zn
=
tristimulus_d50
[
2
]
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un
=
4
*
xn
/
(
xn
+
15
*
yn
+
3
*
zn
)
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vn
=
9
*
yn
/
(
xn
+
15
*
yn
+
3
*
zn
)
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epsilon
=
216
/
24389
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kappa
=
24389
/
27
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function
xyzd50_luv
(
[
x
,
y
,
z
]
)
{
const
d
=
x
+
15
*
y
+
3
*
z
;
if
(
d
===
0
)
return
[
0
,
0
,
0
]
;
const
yr
=
y
/
yn
;
const
l
=
yr
>
epsilon
?
116
*
Math
.
cbrt
(
yr
)
-
16
:
kappa
*
yr
;
return
[
l
,
13
*
l
*
(
4
*
x
/
d
-
un
)
,
13
*
l
*
(
9
*
y
/
d
-
vn
)
]
;
}
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color_luv
=
xyzd50_luv
(
color_xyzd50
)
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function
luv_xyzd50
(
[
l
,
u
,
v
]
)
{
if
(
l
===
0
)
return
[
0
,
0
,
0
]
;
const
up
=
u
/
(
13
*
l
)
+
un
;
const
vp
=
v
/
(
13
*
l
)
+
vn
;
const
y
=
yn
*
(
l
>
8
?
(
(
l
+
16
)
/
116
)
**
3
:
l
/
kappa
)
;
const
d
=
4
*
vp
;
return
[
y
*
9
*
up
/
d
,
y
,
y
*
(
12
-
3
*
up
-
20
*
vp
)
/
d
]
;
}
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luv_xyzd50
(
color_luv
)
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function
luv_hcl
(
[
l
,
u
,
v
]
)
{
const
h
=
Math
.
atan2
(
v
,
u
)
*
rad2deg
;
return
[
h
<
0
?
h
+
360
:
h
,
Math
.
hypot
(
u
,
v
)
,
l
]
;
}
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function
hcl_luv
(
[
h
,
c
,
l
]
)
{
h
*=
deg2rad
;
return
[
l
,
c
*
Math
.
cos
(
h
)
,
c
*
Math
.
sin
(
h
)
]
;
}
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color_hcl
=
luv_hcl
(
color_luv
)
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hcl_luv
(
color_hcl
)
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rad2deg
=
180
/
Math
.
PI
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deg2rad
=
Math
.
PI
/
180
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import
{
tristimulus_d50
,
rgb_lrgb
,
lrgb_rgb
,
lrgb_xyzd50
,
xyzd50_lrgb
,
xyzd50_lab
,
lab_xyzd50
}
from
"@mbostock/lab-and-rgb"
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import
{
ramp
}
from
"@mbostock/color-ramp"
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One platform
to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.
Try it for free
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xn
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yn
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un
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vn
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epsilon
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kappa
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xyzd50_luv
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rad2deg
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