HSL Color Palette Harmonizer
Generate five-color HSL palettes in analogous, complementary, split-complementary or triadic modes. Preview button and background colors, then download the CSS variables.
About this hsl color palette harmonizer
Generate five-color HSL palettes in analogous, complementary, split-complementary or triadic modes. Preview button and background colors, then download the CSS variables Processes media assets directly in the browser using HTML5 Canvas and WebAssembly decoders, ensuring zero file uploads.
Image processing & canvas pipeline
Computes color space transformations and accessibility metrics conforming to W3C CSS Color Module Level 4, CIE 1931 XYZ, sRGB, HSL, HSV, CIELAB, and WCAG 2.1 contrast guidelines. Contrast ratios calculate relative luminance ($L = 0.2126R + 0.7152G + 0.0722B$) with gamma expansion, enforcing minimum ratios of 4.5:1 for standard text (Level AA) and 7:1 for enhanced text (Level AAA). Color blindness simulations evaluate 3x3 spectral transformation matrices for Protanopia, Deuteranopia, Tritanopia, and Achromatopsia.
Worked image transformation example
Scenario: Derive two analogous and two triadic HSL rotations from red.
Sample input:
Processing: Convert RGB to HSL, rotate hue by −30°, +30°, +120° and +240°, then convert to rounded hex RGB.
Illustrative output:
Resolution, dimension & memory limits
Operational constraints and validation boundaries: Accepts 3/6-digit HEX or integer comma-separated rgb() channels 0–255; no alpha, percentages or named colors. Uses the HSL hue wheel with RGB channels rounded to 8 bits. Achromatic or clipped colors can repeat. This is a geometric harmony aid, not perceptual matching, an accessibility/contrast check or proof of Munsell/Ostwald equivalence. Preview text stays white; check contrast before use. CSS contains five color variables and background rules, not a complete theme. Runs locally; original JSON output remains separate.
HSL Color Palette Harmonizer image operations execute in client memory via HTML5 Canvas and browser decoders. Inspect output previews before replacing source assets.
In-memory image processing boundary
File buffers and document assets in HSL Color Palette Harmonizer are processed in-memory via local browser APIs with zero file uploads to CZOA servers.
Image format & W3C Canvas standards
W3C Canvas 2D context specifications and standard image container formats:
- HSL hue rotation by ±30°/±120° (implementation formula; no CIE distance)
HSL Color Palette Harmonizer verification · Audit standards
How to use it
- Enter, paste, or select your input data into the HSL Color Palette Harmonizer workspace controls.
- Original JSON palette calculator: Enter a valid HEX color.
Frequently asked questions
How are the five palette colors generated?+
Operational requirements for "How are the five palette colors generated?" are verified in local memory during execution of HSL Color Palette Harmonizer.
Which inputs and controls are available?+
Enter a base color and choose a mode. Analogous offsets: 0°, −60°, −30°, +30°, +60°. Complementary: base, +180°, lighter base, lighter complement, darker base. Split-complementary: base, +150°, +210°, lighter base, darker base. Triadic: base, +120°, +240°, lighter base, darker base. Lighter/darker variants add/subtract 20 percentage points of HSL lightness, clamped to 0–100%. Example: red (#ff0000), triadic → #ff0000, #00ff00, #0000ff, #ff6666, #990000. The preview uses colors 1 and 2. Download CSS for all five variables.
What limits apply to the palette output?+
Accepts 3/6-digit HEX or integer comma-separated rgb() channels 0–255; no alpha, percentages or named colors.
What result should the documented example produce?+
For #ff0000 it returns analogous #ff0080 and #ff8000, plus triadic #00ff00 and #0000ff.