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chroma-js
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JavaScript library for color conversions
github.com/gka/chroma.js
gka/chroma.js
chroma-js
/
src
/
converter
/
misc
/
lab2lch.coffee
9 lines
(7 loc)
•
196 B
text/coffeescript
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# @requires utils
lab2lch
=
(
)
->
[
l
,
a
,
b
]
=
unpack arguments
c
=
sqrt
(
a
*
a
+
b
*
b
)
h
=
(
atan2
(
b
,
a
)
*
RAD2DEG
+
360
)
%
360
h
=
Number.NaN
if
round
(
c
*
10000
)
==
0
[
l
,
c
,
h
]