pixijs-color
Use this skill when creating, converting, or manipulating colors in PixiJS v8. Covers Color class input formats (hex, CSS names, RGB/HSL objects, arrays, Uint8Array), conversion methods (toHex, toNumber, toArray, toRgba), component access, setAlpha/multiply/premultiply, Color.shared singleton. Triggers on: Color, ColorSource, hex, rgb, hsl, tint, premultiply, Color.shared, color conversion.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/pixijs/pixijs-skills --skill pixijs-color- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads pixijs-color automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
Security audits
Independent scans of the skill's instructions and bundled files.
SKILL.md
The instructions your agent reads when the skill is triggered.
The Color class creates and converts colors for tints, fills, strokes, and anywhere PixiJS accepts a ColorSource. Most APIs accept raw hex/strings directly, so explicit new Color(...) is only needed when converting formats or manipulating values.
Quick Start
const fillColor = new Color("#ff6600");
console.log(fillColor.toHex()); // '#ff6600'
console.log(fillColor.toNumber()); // 0xff6600
console.log(fillColor.toArray()); // [1, 0.4, 0, 1]
const g = new Graphics().rect(0, 0, 200, 100).fill(fillColor);
app.stage.addChild(g);
const sprite = Sprite.from("hero.png");
sprite.tint = "dodgerblue";
app.stage.addChild(sprite);
const t = Color.shared.setValue(0xffffff).multiply([1, 0.5, 0.5]).toNumber();
sprite.tint = t;
Related skills: pixijs-scene-graphics (fill/stroke colors), pixijs-scene-sprite (tint), pixijs-blend-modes (compositing).
Core Patterns
Accepted input formats
import { Color } from "pixi.js";
// Hex integer
new Color(0xff0000);
// Hex strings
new Color("#ff0000");
new Color("#f00");
new Color("ff0000");
// CSS color names
new Color("red");
new Color("dodgerblue");
// RGB/RGBA objects (components 0-255)
new Color({ r: 255, g: 0, b: 0 });
new Color({ r: 255, g: 0, b: 0, a: 0.5 });
// HSL/HSLA objects
new Color({ h: 0, s: 100, l: 50 });
new Color({ h: 0, s: 100, l: 50, a: 0.5 });
// HSV/HSVA objects
new Color({ h: 0, s: 100, v: 100 });
// CSS strings
new Color("rgb(255, 0, 0)");
new Color("rgba(255, 0, 0, 0.5)");
new Color("hsl(0, 100%, 50%)");
// Normalized 0-1 arrays (Float32Array or plain arrays)
new Color([1, 0, 0]); // RGB
new Color([1, 0, 0, 0.5]); // RGBA
// Uint8 arrays (components 0-255)
new Color(new Uint8Array([255, 0, 0]));
new Color(new Uint8ClampedArray([255, 0, 0, 128]));
// 8-digit hex with alpha
new Color("#ff0000ff");
new Color("#f00f");
// Copy from another Color instance
const red = new Color("red");
const copy = new Color(red);
Conversion methods
import { Color } from "pixi.js";
const color = new Color("#ff6600");
color.toHex(); // '#ff6600'
color.toHexa(); // '#ff6600ff' (hex with alpha)
color.toNumber(); // 0xff6600
color.toArray(); // [1, 0.4, 0, 1] (normalized RGBA)
color.toRgbArray(); // [1, 0.4, 0] (normalized RGB, no alpha)
color.toRgbaString(); // 'rgba(255,102,0,1)'
color.toRgba(); // { r: 1, g: 0.4, b: 0, a: 1 }
color.toRgb(); // { r: 1, g: 0.4, b: 0 }
color.toUint8RgbArray(); // [255, 102, 0]
// setValue() is the chainable way to change a color's value
color.setValue(0xff0000).toHex(); // '#ff0000'
Component access
import { Color } from "pixi.js";
const color = new Color("rgba(255, 128, 0, 0.8)");
color.red; // 1
color.green; // ~0.502
color.blue; // 0
color.alpha; // 0.8
All component getters return normalized 0-1 values.
Manipulation
import { Color } from "pixi.js";
const color = new Color("red");
// Set alpha (chainable)
color.setAlpha(0.5);
// Multiply with another color (destructive, modifies in place)
color.multiply(0x808080);
// Premultiply alpha (destructive, RGB channels multiplied by alpha)
color.premultiply(0.8);
// Premultiply alpha only (RGB unchanged)
color.premultiply(0.8, false);
// Chain operations
new Color("white").setAlpha(0.5).multiply([0.8, 0.2, 0.2]);
multiply() and premultiply() are destructive; they modify the color and set value to null (original format is lost).
Non-destructive premultiplied output
import { Color } from "pixi.js";
const color = new Color("red").setAlpha(0.5);
const packed = color.toPremultiplied(color.alpha); // 0x7F7F0000
const alphaOnly = color.toPremultiplied(color.alpha, false); // 0x7FFF0000
toPremultiplied(alpha, applyToRGB?) returns a 32-bit 0xAARRGGBB integer without mutating this. Use it in batchers and tint math where the source color must be reused. When applyToRGB is false, only the alpha byte is packed; the RGB stays at its full value.
Reusing output buffers
import { Color } from "pixi.js";
const rgba = new Float32Array(4);
const rgb = new Float32Array(3);
const rgb8 = new Uint8Array(3);
app.ticker.add(() => {
Color.shared.setValue(sprite.tint).toArray(rgba).toRgbArray(rgb);
Color.shared.toUint8RgbArray(rgb8);
});
toArray(out?), toRgbArray(out?), and toUint8RgbArray(out?) accept a reusable number[], Float32Array, Uint8Array, or Uint8ClampedArray and write into it. Pass your own buffer in hot paths to avoid allocating per frame; omit the argument and the Color instance returns its internal cache array.
Packing for GPU buffers
| Method | Returns |
|---|---|
toBgrNumber() | 24-bit 0xBBGGRR integer with R/B swapped |
toLittleEndianNumber() | Same 24-bit swap, convenient for little-endian vertex writes |
Both are cheap and useful when emitting colors straight into packed vertex attributes.
Color.shared for temporary operations
import { Color } from "pixi.js";
// One-off conversion without allocating a new Color
const hex = Color.shared.setValue("#ff6600").toNumber();
const arr = Color.shared.setValue(0xff0000).toArray();
Color.shared is a singleton that avoids allocating a new Color on every call. This matters in hot paths like render loops or per-frame tint calculations where repeated new Color() creates GC pressure. Do not store references to it; other code may mutate it.
import { Color } from "pixi.js";
// Good: reuse shared instance in a per-frame callback
app.ticker.add(() => {
const t = performance.now() / 1000;
sprite.tint = Color.shared
.setValue("white")
.multiply([Math.sin(t) * 0.5 + 0.5, 0.2, 0.8])
.toNumber();
});
Validating input
import { Color } from "pixi.js";
Color.isColorLike("red"); // true
Color.isColorLike("#ff0000"); // true
Color.isColorLike(0xff0000); // true
Color.isColorLike([1, 0, 0]); // true
Color.isColorLike({ r: 1, g: 0, b: 0 }); // true
Color.isColorLike({ foo: 1 }); // false
Color.isColorLike(null); // false
Color.isColorLike() checks the structural shape (string, number, array, or recognized object). It doesn't validate that a string is a real CSS color name, nor that array values fall in range. Use it as a type guard before passing user input to new Color() or setValue().
Common Mistakes
[MEDIUM] Expecting toRgba() to return 0-255 values
Wrong:
import { Color } from "pixi.js";
const { r, g, b } = new Color({ r: 255, g: 128, b: 0 }).toRgba();
// r = 1, g = ~0.502, b = 0 (NOT 255, 128, 0)
Correct:
import { Color } from "pixi.js";
// Use toUint8RgbArray() for 0-255 output
const [r, g, b] = new Color({ r: 255, g: 128, b: 0 }).toUint8RgbArray();
// r = 255, g = 128, b = 0
RGB object inputs use 0-255 range ({ r: 255, g: 0, b: 0 }), but all output methods (toRgba(), toRgb(), toArray(), toRgbArray()) normalize to 0-1. Use toUint8RgbArray() when you need 0-255 integers for CSS or external APIs.
[MEDIUM] Using 0-255 range in color arrays
Wrong:
import { Color } from "pixi.js";
new Color([255, 0, 0]); // NOT red; values are interpreted as 0-1
Correct:
import { Color } from "pixi.js";
new Color([1, 0, 0]); // red via normalized array
new Color(0xff0000); // red via hex
new Color("red"); // red via CSS name
new Color(new Uint8Array([255, 0, 0])); // red via Uint8Array (0-255)
Plain number arrays (number[] and Float32Array) use normalized 0-1 range. [255, 0, 0] clamps to [1, 0, 0] because values are clamped, but [200, 100, 50] does not produce the expected color. Use Uint8Array or Uint8ClampedArray for 0-255 input.
[MEDIUM] Using utils.string2hex or utils.hex2string
Wrong:
import { utils } from "pixi.js";
const hex = utils.string2hex("#ff0000");
Correct:
import { Color } from "pixi.js";
const hex = new Color("#ff0000").toNumber();
const str = new Color(0xff0000).toHex();
The utils namespace was removed in v8. Use the Color class for all color conversions.
API Reference
FAQ
What does the pixijs-color skill do?
Use this skill when creating, converting, or manipulating colors in PixiJS v8. Covers Color class input formats (hex, CSS names, RGB/HSL objects, arrays, Uint8Array), conversion methods (toHex, toNumber, toArray, toRgba), component access, setAlpha/multiply/premultiply, Color.shared singleton. Triggers on: Color, ColorSource, hex, rgb, hsl, tint, premultiply, Color.shared, color conversion.
How do I install pixijs-color?
Run npx skills add https://github.com/pixijs/pixijs-skills --skill pixijs-color in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/pixijs-color/ (personal) or .claude/skills/pixijs-color/ (project).
Which AI agents can use pixijs-color?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is pixijs-color safe to install?
Security partners have reviewed it: Gen Agent Trust Hub passed; Socket passed; Snyk passed; ZeroLeaks passed. As with any skill, read the SKILL.md and bundled scripts before installing.
Who maintains pixijs-color?
It is published by pixijs in pixijs/pixijs-skills. It has 5,761 recorded installs.
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