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Volodymyr Agafonkin
Engineer at Mapbox, creator of Leaflet, algorithms geek, open source enthusiast, musician, father of twin girls, Ukrainian. 🇺🇦
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Published
Explorables
By
Volodymyr Agafonkin
Edited
Sep 23, 2019
13 stars
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chromaBlend
=
(
fgC
,
bgC
,
keyC
,
mask
)
=>
Math
.
max
(
fgC
-
mask
*
keyC
,
0
)
+
mask
*
bgC
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chromaKeyMask
=
(
r
,
g
,
b
,
keyCb
,
keyCr
,
tolA
,
tolB
)
=>
{
const
cb
=
rgb2cb
(
r
,
g
,
b
)
;
const
cr
=
rgb2cr
(
r
,
g
,
b
)
;
const
d
=
Math
.
hypot
(
keyCb
-
cb
,
keyCr
-
cr
)
;
return
1
-
(
d
<
tolA
?
0
:
d
>
tolB
?
1
:
(
d
-
tolA
)
/
(
tolB
-
tolA
)
)
;
}
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rgb2cb
=
(
r
,
g
,
b
)
=>
Math
.
round
(
128
-
0.168736
*
r
-
0.331264
*
g
+
0.5
*
b
)
Insert cell
rgb2cr
=
(
r
,
g
,
b
)
=>
Math
.
round
(
128
+
0.5
*
r
-
0.418688
*
g
-
0.081312
*
b
)
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keyColor
=
{
const
k
=
4
*
(
30
*
foregroundImg
.
naturalWidth
+
30
)
;
// fetch foreground pixel at [30, 30]
return
fg
.
slice
(
k
,
k
+
3
)
;
}
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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
Learn more
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bg
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fg
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keyColor
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getPixelData
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