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Comparing version 2.0.3 to 2.1.0-alpha.1

src/constants.js

2

bundled/culori.min.js

@@ -1,1 +0,1 @@

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{
"name": "culori",
"version": "2.0.3",
"version": "2.1.0-alpha.1",
"type": "module",

@@ -5,0 +5,0 @@ "main": "./bundled/culori.cjs",

@@ -23,9 +23,9 @@ /*

y:
0.29734497525053605 * r +
0.297344975250536 * r +
0.6273635662554661 * g +
0.07529145849399788 * b,
0.0752914584939979 * b,
z:
0.02703136138641234 * r +
0.07068885253582723 * g +
0.9913375368376388 * b
0.0270313613864123 * r +
0.0706888525358272 * g +
0.9913375368376386 * b
};

@@ -32,0 +32,0 @@ if (a98.alpha !== undefined) {

@@ -16,14 +16,14 @@ /*

x * 2.0415879038107465 -
y * 0.5650069742788596 -
0.34473135077832956 * z
y * 0.5650069742788597 -
0.3447313507783297 * z
),
g: gamma(
x * -0.9692436362808795 +
y * 1.8759675015077202 +
0.04155505740717557 * z
x * -0.9692436362808798 +
y * 1.8759675015077206 +
0.0415550574071756 * z
),
b: gamma(
x * 0.013444280632031142 -
y * 0.11836239223101838 +
1.0151749943912054 * z
x * 0.0134442806320312 -
y * 0.1183623922310184 +
1.0151749943912058 * z
)

@@ -30,0 +30,0 @@ };

import converter from './converter.js';
import displayable from './displayable.js';
import prepare from './_prepare.js';
import { getMode } from './modes.js';
import { differenceEuclidean } from './difference.js';
let rgb = converter('rgb');
const rgb = converter('rgb');
const fixup_rgb = color => {
let c = rgb(color);
const c = rgb(color);
c.r = Math.max(0, Math.min(c.r, 1));

@@ -16,3 +15,47 @@ c.g = Math.max(0, Math.min(c.g, 1));

export const clampRgb = color => {
/*
Returns whether the color is in the sRGB gamut.
*/
export function displayable(color) {
const c = rgb(color);
return (
c !== undefined &&
c.r >= 0 &&
c.r <= 1 &&
c.g >= 0 &&
c.g <= 1 &&
c.b >= 0 &&
c.b <= 1
);
}
/*
Given a color space `mode`, returns a function
with which to check whether a color is
in that color space's gamut.
*/
export function inGamut(mode = 'rgb') {
const conv = converter(mode);
const { channels, ranges } = getMode(mode);
return color => {
const c = conv(color);
return (
c !== undefined &&
channels.every(
ch =>
ch === 'alpha' ||
(c[ch] >= ranges[ch][0] && c[ch] <= ranges[ch][1])
)
);
};
}
/*
Obtain a color that's in the sRGB gamut
by converting it to sRGB and clipping the channel values
so that they're within the [0, 1] range.
The result is returned in the color's original color space.
*/
export function clampRgb(color) {
color = prepare(color);

@@ -27,5 +70,54 @@

return conv(fixup_rgb(color));
};
}
export const clampChroma = (color, mode = 'lch') => {
/*
Given the `mode` color space, returns a function
with which to obtain a color that's in gamut for
the `mode` color space by clipping the channel values
so that they fit in their respective ranges.
It's similar to `clampRgb`, but works for any
bounded color space (RGB or not) for which
any combination of in-range channel values
produces an in-gamut color.
*/
export function clampGamut(mode = 'rgb') {
const gamutConverter = converter(mode);
const { channels, ranges } = getMode(mode);
return color => {
const c = gamutConverter(color);
if (c === undefined) {
return undefined;
}
return channels.reduce(
(res, ch) => {
if (c[ch] !== undefined) {
if (ch === 'alpha') {
res.alpha = c.alpha;
} else {
res[ch] = Math.max(
Math.min(c[ch], ranges[ch][1]),
ranges[ch][0]
);
}
}
return res;
},
{ mode }
);
};
}
/*
Obtain a color that's in the sRGB gamut
by first converting it to `mode` and then
finding the the greatest chroma value
that fits the gamut.
By default, the CIELCh color space is used,
but any color that has a chroma component will do.
The result is returned in the color's original color space.
*/
export function clampChroma(color, mode = 'lch') {
color = prepare(color);

@@ -72,2 +164,93 @@

);
};
}
/*
Obtain a color that's in the `dest` gamut,
by first converting it to the `mode` color space
and then finding the largest chroma that's in gamut,
similar to `clampChroma`.
To address the shortcomings of `clampChroma`, which can
sometimes produce colors more desaturated than necessary,
at every step of the iteration the candidate color
is compared to the clipped version (obtained with `clampGamut`),
and if the colors are not to dissimilar (judged by the `delta`
color difference function and an associated `jnd`
just-noticeable difference value), returns the clipped version.
The default arguments for this function correspond to the
gamut mapping algorithm defined in CSS Color Level 4:
https://drafts.csswg.org/css-color/#css-gamut-mapping
*/
export function toGamut(
dest = 'rgb',
mode = 'oklch',
delta = differenceEuclidean('oklch'),
jnd = 0.02
) {
const inDestinationGamut = inGamut(dest);
const clipToGamut = clampGamut(dest);
const destConv = converter(dest);
const ucs = converter(mode);
const { ranges } = getMode(mode);
const gamutDef = getMode(dest);
const White = { mode: dest };
const Black = { mode: dest };
gamutDef.channels.forEach(ch => {
Black[ch] = gamutDef.ranges[0];
White[ch] = gamutDef.ranges[1];
});
return color => {
color = prepare(color);
if (color === undefined) {
return undefined;
}
const candidate = ucs(color);
if (candidate.l >= ranges.l[1]) {
const res = { ...White };
if (color.alpha !== undefined) {
res.alpha = color.alpha;
}
return res;
}
if (candidate.l <= ranges.l[0]) {
const res = { ...Black };
if (color.alpha !== undefined) {
res.alpha = color.alpha;
}
return res;
}
if (inDestinationGamut(candidate)) {
return destConv(candidate);
}
let start = 0;
let end = candidate.c;
let lastGood;
let clipped;
/* Corresponds to about a dozen steps */
let ε = (ranges.c[1] - ranges.c[0]) / 8000;
while (end - start > ε) {
candidate.c = (start + end) * 0.5;
if (inDestinationGamut(candidate)) {
start = candidate.c;
lastGood = candidate.c;
} else {
clipped = clipToGamut(candidate);
if (delta(clipped, candidate) < jnd) {
return clipped;
} else {
end = candidate.c;
}
}
}
if (!inDestinationGamut(candidate)) {
candidate.c = lastGood;
}
return destConv(candidate);
};
}

@@ -97,4 +97,10 @@ // Color space definitions

export { default as samples } from './samples.js';
export { default as displayable } from './displayable.js';
export { clampRgb, clampChroma } from './clamp.js';
export {
displayable,
inGamut,
toGamut,
clampRgb,
clampChroma,
clampGamut
} from './clamp.js';
export { default as nearest } from './nearest.js';

@@ -101,0 +107,0 @@ export { useMode, getMode, useParser, removeParser } from './modes.js';

@@ -98,4 +98,10 @@ // Color space definitions

export { default as samples } from './samples.js';
export { default as displayable } from './displayable.js';
export { clampRgb, clampChroma } from './clamp.js';
export {
displayable,
inGamut,
toGamut,
clampRgb,
clampChroma,
clampGamut
} from './clamp.js';
export { default as nearest } from './nearest.js';

@@ -102,0 +108,0 @@ export { useMode, getMode, useParser, removeParser } from './modes.js';

@@ -1,2 +0,3 @@

import { Xn, Yn, Zn, k, e } from '../xyz50/constants.js';
import { k, e } from '../xyz50/constants.js';
import { D50 } from '../constants.js';

@@ -12,5 +13,5 @@ let fn = v => (Math.pow(v, 3) > e ? Math.pow(v, 3) : (116 * v - 16) / k);

mode: 'xyz50',
x: fn(fx) * Xn,
y: fn(fy) * Yn,
z: fn(fz) * Zn
x: fn(fx) * D50.X,
y: fn(fy) * D50.Y,
z: fn(fz) * D50.Z
};

@@ -17,0 +18,0 @@

@@ -1,2 +0,3 @@

import { Xn, Yn, Zn, k, e } from '../xyz50/constants.js';
import { k, e } from '../xyz50/constants.js';
import { D50 } from '../constants.js';

@@ -6,5 +7,5 @@ const f = value => (value > e ? Math.cbrt(value) : (k * value + 16) / 116);

const convertXyz50ToLab = ({ x, y, z, alpha }) => {
let f0 = f(x / Xn);
let f1 = f(y / Yn);
let f2 = f(z / Zn);
let f0 = f(x / D50.X);
let f1 = f(y / D50.Y);
let f2 = f(z / D50.Z);

@@ -11,0 +12,0 @@ let res = {

@@ -1,2 +0,3 @@

import { Xn, Yn, Zn, k, e } from '../xyz65/constants.js';
import { k, e } from '../xyz65/constants.js';
import { D65 } from '../constants.js';

@@ -12,5 +13,5 @@ let fn = v => (Math.pow(v, 3) > e ? Math.pow(v, 3) : (116 * v - 16) / k);

mode: 'xyz65',
x: fn(fx) * Xn,
y: fn(fy) * Yn,
z: fn(fz) * Zn
x: fn(fx) * D65.X,
y: fn(fy) * D65.Y,
z: fn(fz) * D65.Z
};

@@ -17,0 +18,0 @@

@@ -1,2 +0,3 @@

import { Xn, Yn, Zn, k, e } from '../xyz65/constants.js';
import { k, e } from '../xyz65/constants.js';
import { D65 } from '../constants.js';

@@ -6,5 +7,5 @@ const f = value => (value > e ? Math.cbrt(value) : (k * value + 16) / 116);

const convertXyz65ToLab65 = ({ x, y, z, alpha }) => {
let f0 = f(x / Xn);
let f1 = f(y / Yn);
let f2 = f(z / Zn);
let f0 = f(x / D65.X);
let f1 = f(y / D65.Y);
let f2 = f(z / D65.Z);

@@ -11,0 +12,0 @@ let res = {

@@ -1,2 +0,3 @@

import { Xn, Yn, Zn, k } from '../xyz50/constants.js';
import { k } from '../xyz50/constants.js';
import { D50 } from '../constants.js';

@@ -6,4 +7,4 @@ export const u_fn = (x, y, z) => (4 * x) / (x + 15 * y + 3 * z);

export const un = u_fn(Xn, Yn, Zn);
export const vn = v_fn(Xn, Yn, Zn);
export const un = u_fn(D50.X, D50.Y, D50.Z);
export const vn = v_fn(D50.X, D50.Y, D50.Z);

@@ -13,3 +14,3 @@ const convertLuvToXyz50 = ({ l, u, v, alpha }) => {

let vp = v / (13 * l) + vn;
let y = Yn * (l <= 8 ? l / k : Math.pow((l + 16) / 116, 3));
let y = D50.Y * (l <= 8 ? l / k : Math.pow((l + 16) / 116, 3));
let x = (y * (9 * up)) / (4 * vp);

@@ -16,0 +17,0 @@ let z = (y * (12 - 3 * up - 20 * vp)) / (4 * vp);

@@ -1,2 +0,3 @@

import { Xn, Yn, Zn, k, e } from '../xyz50/constants.js';
import { k, e } from '../xyz50/constants.js';
import { D50 } from '../constants.js';

@@ -6,4 +7,4 @@ export const u_fn = (x, y, z) => (4 * x) / (x + 15 * y + 3 * z);

export const un = u_fn(Xn, Yn, Zn);
export const vn = v_fn(Xn, Yn, Zn);
export const un = u_fn(D50.X, D50.Y, D50.Z);
export const vn = v_fn(D50.X, D50.Y, D50.Z);

@@ -13,3 +14,3 @@ const l_fn = value => (value <= e ? k * value : 116 * Math.cbrt(value) - 16);

const convertXyz50ToLuv = ({ x, y, z, alpha }) => {
let l = l_fn(y / Yn);
let l = l_fn(y / D50.Y);
let u = u_fn(x, y, z);

@@ -16,0 +17,0 @@ let v = v_fn(x, y, z);

@@ -25,3 +25,3 @@ import lch from '../lch/definition.js';

ranges: {
l: [0, 0.999],
l: [0, 1],
c: [0, 0.322],

@@ -28,0 +28,0 @@ h: [0, 360]

@@ -15,5 +15,11 @@ /*

mode: 'xyz65',
x: 0.4865709 * r + 0.2656676 * g + 0.1982172 * b,
y: 0.2289745 * r + 0.6917385 * g + 0.0792869 * b,
z: 0.0 * r + 0.0451133 * g + 1.0439443 * b
x:
0.486570948648216 * r +
0.265667693169093 * g +
0.1982172852343625 * b,
y:
0.2289745640697487 * r +
0.6917385218365062 * g +
0.079286914093745 * b,
z: 0.0 * r + 0.0451133818589026 * g + 1.043944368900976 * b
};

@@ -20,0 +26,0 @@ if (alpha !== undefined) {

@@ -14,5 +14,14 @@ /*

{
r: x * 2.4934969 - y * 0.9313836 - 0.4027107 * z,
g: x * -0.8294889 + y * 1.762664 + 0.0236246 * z,
b: x * 0.0358458 - y * 0.0761723 + 0.9568845 * z
r:
x * 2.4934969119414263 -
y * 0.9313836179191242 -
0.402710784450717 * z,
g:
x * -0.8294889695615749 +
y * 1.7626640603183465 +
0.0236246858419436 * z,
b:
x * 0.0358458302437845 -
y * 0.0761723892680418 +
0.9568845240076871 * z
},

@@ -19,0 +28,0 @@ 'p3'

@@ -24,10 +24,10 @@ /*

x:
0.7977604896723027 * r +
0.13518583717574031 * g +
0.0313493495815248 * b,
0.7977666449006423 * r +
0.1351812974005331 * g +
0.0313477341283922 * b,
y:
0.2880711282292934 * r +
0.7118432178101014 * g +
0.00008565396060525902 * b,
z: 0.0 * r + 0.0 * g + 0.8251046025104601 * b
0.2880748288194013 * r +
0.7118352342418731 * g +
0.0000899369387256 * b,
z: 0 * r + 0 * g + 0.8251046025104602 * b
};

@@ -34,0 +34,0 @@ if (prophoto.alpha !== undefined) {

@@ -21,12 +21,12 @@ /*

r: gamma(
x * 1.3457989731028281 -
y * 0.25558010007997534 -
0.05110628506753401 * z
x * 1.3457868816471585 -
y * 0.2555720873797946 -
0.0511018649755453 * z
),
g: gamma(
x * -0.5446224939028347 +
y * 1.5082327413132781 +
0.02053603239147973 * z
x * -0.5446307051249019 +
y * 1.5082477428451466 +
0.0205274474364214 * z
),
b: gamma(x * 0.0 + y * 0.0 + 1.2119675456389454 * z)
b: gamma(x * 0.0 + y * 0.0 + 1.2119675456389452 * z)
};

@@ -33,0 +33,0 @@ if (alpha !== undefined) {

@@ -28,10 +28,10 @@ /*

x:
0.6369580483012914 * r +
0.14461690358620832 * g +
0.6369580483012911 * r +
0.1446169035862083 * g +
0.1688809751641721 * b,
y:
0.2627002120112671 * r +
0.262700212011267 * r +
0.6779980715188708 * g +
0.05930171646986196 * b,
z: 0 * r + 0.028072693049087428 * g + 1.060985057710791 * b
0.059301716469862 * b,
z: 0 * r + 0.0280726930490874 * g + 1.0609850577107909 * b
};

@@ -38,0 +38,0 @@ if (rec2020.alpha !== undefined) {

@@ -24,15 +24,15 @@ /*

r: gamma(
x * 1.7166511879712674 -
y * 0.35567078377639233 -
0.25336628137365974 * z
x * 1.7166511879712683 -
y * 0.3556707837763925 -
0.2533662813736599 * z
),
g: gamma(
x * -0.6666843518324892 +
x * -0.6666843518324893 +
y * 1.6164812366349395 +
0.01576854581391113 * z
0.0157685458139111 * z
),
b: gamma(
x * 0.017639857445310783 -
y * 0.042770613257808524 +
0.9421031212354738 * z
x * 0.0176398574453108 -
y * 0.0427706132578085 +
0.9421031212354739 * z
)

@@ -39,0 +39,0 @@ };

@@ -1,7 +0,2 @@

// D50 white
export const Xn = 0.96422;
export const Yn = 1.0;
export const Zn = 0.82521;
export const k = Math.pow(29, 3) / Math.pow(3, 3);
export const e = Math.pow(6, 3) / Math.pow(29, 3);

@@ -16,5 +16,14 @@ /*

mode: 'xyz50',
x: 0.4360747 * r + 0.3850649 * g + 0.1430804 * b,
y: 0.2225045 * r + 0.7168786 * g + 0.0606169 * b,
z: 0.0139322 * r + 0.0971045 * g + 0.7141733 * b
x:
0.436065742824811 * r +
0.3851514688337912 * g +
0.14307845442264197 * b,
y:
0.22249319175623702 * r +
0.7168870538238823 * g +
0.06061979053616537 * b,
z:
0.013923904500943465 * r +
0.09708128566574634 * g +
0.7140993584005155 * b
};

@@ -21,0 +30,0 @@ if (alpha !== undefined) {

@@ -13,5 +13,14 @@ /*

let res = convertLrgbToRgb({
r: x * 3.1338561 - y * 1.6168667 - 0.4906146 * z,
g: x * -0.9787684 + y * 1.9161415 + 0.033454 * z,
b: x * 0.0719453 - y * 0.2289914 + 1.4052427 * z
r:
x * 3.1341359569958707 -
y * 1.6173863321612538 -
0.4906619460083532 * z,
g:
x * -0.978795502912089 +
y * 1.916254567259524 +
0.03344273116131949 * z,
b:
x * 0.07195537988411677 -
y * 0.2289768264158322 +
1.405386058324125 * z
});

@@ -18,0 +27,0 @@ if (alpha !== undefined) {

@@ -1,7 +0,2 @@

// D65 white
export const Xn = 0.95047;
export const Yn = 1.0;
export const Zn = 1.08883;
export const k = Math.pow(29, 3) / Math.pow(3, 3);
export const e = Math.pow(6, 3) / Math.pow(29, 3);

@@ -7,2 +7,3 @@ /*

* http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
* https://observablehq.com/@danburzo/color-matrix-calculator
*/

@@ -16,5 +17,14 @@

mode: 'xyz65',
x: 0.4124564 * r + 0.3575761 * g + 0.1804375 * b,
y: 0.2126729 * r + 0.7151522 * g + 0.072175 * b,
z: 0.0193339 * r + 0.119192 * g + 0.9503041 * b
x:
0.4123907992659593 * r +
0.357584339383878 * g +
0.1804807884018343 * b,
y:
0.2126390058715102 * r +
0.715168678767756 * g +
0.0721923153607337 * b,
z:
0.0193308187155918 * r +
0.119194779794626 * g +
0.9505321522496607 * b
};

@@ -21,0 +31,0 @@ if (alpha !== undefined) {

@@ -14,5 +14,14 @@ /*

mode: 'xyz65',
x: 0.9555766 * x - 0.0230393 * y + 0.0631636 * z,
y: -0.0282895 * x + 1.0099416 * y + 0.0210077 * z,
z: 0.0122982 * x - 0.020483 * y + 1.3299098 * z
x:
0.9554734527042182 * x -
0.0230985368742614 * y +
0.0632593086610217 * z,
y:
-0.0283697069632081 * x +
1.0099954580058226 * y +
0.021041398966943 * z,
z:
0.0123140016883199 * x -
0.0205076964334779 * y +
1.3303659366080753 * z
};

@@ -19,0 +28,0 @@ if (alpha !== undefined) {

@@ -7,2 +7,3 @@ /*

* http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
* https://observablehq.com/@danburzo/color-matrix-calculator
*/

@@ -14,5 +15,14 @@

let res = convertLrgbToRgb({
r: x * 3.2404542 - y * 1.5371385 - 0.4985314 * z,
g: x * -0.969266 + y * 1.8760108 + 0.041556 * z,
b: x * 0.0556434 - y * 0.2040259 + 1.0572252 * z
r:
x * 3.2409699419045226 -
y * 1.5373831775700939 -
0.4986107602930034 * z,
g:
x * -0.9692436362808796 +
y * 1.8759675015077204 +
0.0415550574071756 * z,
b:
x * 0.0556300796969936 -
y * 0.2039769588889765 +
1.0569715142428784 * z
});

@@ -19,0 +29,0 @@ if (alpha !== undefined) {

@@ -14,5 +14,14 @@ /*

mode: 'xyz50',
x: 1.0478112 * x + 0.0228866 * y - 0.050127 * z,
y: 0.0295424 * x + 0.9904844 * y - 0.0170491 * z,
z: -0.0092345 * x + 0.0150436 * y + 0.7521316 * z
x:
1.0479298208405488 * x +
0.0229467933410191 * y -
0.0501922295431356 * z,
y:
0.0296278156881593 * x +
0.990434484573249 * y -
0.0170738250293851 * z,
z:
-0.0092430581525912 * x +
0.0150551448965779 * y +
0.7518742899580008 * z
};

@@ -19,0 +28,0 @@ if (alpha !== undefined) {

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