About

In high-stakes frontend architecture and digital product design, color is data, not just decoration. While screens render light using the RGB (Red, Green, Blue) additive model, production code requires Hexadecimal strings for CSS efficiency, and print media demands CMYK subtraction. A mismatch in these conversions results in brand inconsistency and accessibility violations.

This application functions as a central color logic engine. It goes beyond simple base-16 conversion by calculating the relative luminance of the selected color to determine WCAG 2.1 Compliance. This ensures text legibility and adherence to international web standards. Whether you are defining a design system token or debugging a transparency issue with RGBA, this tool provides the mathematical precision required for production-ready code.

Formulas

The core conversion logic relies on normalizing the integer RGB values [0, 255] to a Hexadecimal string. However, calculating the Relative Luminance (L) for accessibility requires a normalized linear RGB space.

1. RGB to Hex Algorithm:

Hex = # + toBase16(R) + toBase16(G) + toBase16(B)

2. Relative Luminance (WCAG Definition):

L = 0.2126 ⋅ R_lin + 0.7152 ⋅ G_lin + 0.0722 ⋅ B_lin

Where the linear channel C_lin is calculated conditionally:

C_lin =

{

C_sRGB12.92 if C_sRGB ≤ 0.040452.4(C_sRGB + 0.0551.055 otherwise

Reference Data

Color Token	Hex (8-bit)	RGB Vector	HSL (Cylindrical)	Luminance (L)
Absolute Zero	#0048BA	072186	217°, 100%, 37%	0.089
Crimson Red	#DC143C	2202060	348°, 83%, 47%	0.160
Emerald	#50C878	80200120	140°, 52%, 55%	0.428
Safety Orange	#FF6700	2551030	24°, 100%, 50%	0.368
Slate Blue	#6A5ACD	10690205	248°, 53%, 58%	0.158
Chartreuse	#7FFF00	1272550	90°, 100%, 50%	0.760
Deep Pink	#FF1493	25520147	328°, 100%, 54%	0.203
Gold Standard	#FFD700	2552150	51°, 100%, 50%	0.698
Teal	#008080	0128128	180°, 100%, 25%	0.169
Vantablack (Sim)	#010101	111	0°, 0%, 1%	0.000

Frequently Asked Questions

Digital accessibility is legally and ethically required for modern web development. The Contrast Ratio tells you if your selected background color provides enough contrast against white or black text, ensuring that users with visual impairments can read your content.

RGB (Red, Green, Blue) is an additive color model used for digital screens, where colors are created by adding light. CMYK (Cyan, Magenta, Yellow, Key/Black) is a subtractive model used for printing, where colors are created by masking white paper with ink. This tool provides both to bridge the gap between web and print design.

An alpha value of 0 results in a completely transparent color. In Hex code, this is represented as "00" at the end of the string (e.g., #FFFFFF00). While the RGB values technically still exist, the color will be invisible on the screen unless combined with a backdrop filter.

The tool converts your RGB input into the HSL (Hue, Saturation, Lightness) cylindrical coordinate system. It then adds 180 degrees to the Hue angle to find the exact opposite color on the color wheel, ensuring high visual impact and vibrancy.