You're trying to match a brand color exactly. You see a shade of blue on a website and need its hex code. You're building a UI and need the exact RGB values of a color from a reference image. You want to create a palette from a photograph.
Color picking sounds simple but involves real decisions about formats, color spaces, and precision. This guide covers everything you need.
The Three Color Formats You'll Encounter
HEX (Hexadecimal)
The most common format for web development. A # followed by six characters, each representing a value from 0–F.
color: #6366f1; /* indigo */
color: #ef4444; /* red */
color: #10b981; /* emerald */
HEX is compact, widely supported, and the default format in most design tools. The six digits are actually three pairs: red, green, blue — each ranging from 00 (none) to FF (full).
RGB (Red, Green, Blue)
Explicitly names the red, green, and blue channels as decimal numbers (0–255).
color: rgb(99, 102, 241); /* same indigo */
color: rgba(99, 102, 241, 0.5); /* 50% transparent */
RGB is more readable than HEX and essential when you need transparency (rgba) or are doing math on color values programmatically.
HSL (Hue, Saturation, Lightness)
Describes colors in human-intuitive terms — the hue (0–360°, the color wheel position), saturation (0–100%, how vivid), and lightness (0–100%, how light or dark).
color: hsl(239, 84%, 67%); /* same indigo */
color: hsl(239, 84%, 80%); /* lighter tint */
color: hsl(239, 84%, 50%); /* darker shade */
HSL is the most designer-friendly format. Adjusting just the lightness value creates consistent tints and shades of the same hue — perfect for building color scales.
Pick Any Color
Color Picker
Visual HEX/RGB/HSL color picker with sliders, history, and one-click copy.
Pick a Color from Any Image or Photo
Image Color Picker
Click anywhere on an uploaded image to extract the exact HEX and RGB color codes.
When to Use Each Format
| Format | Best For |
|---|---|
| HEX | CSS files, design tokens, sharing colors with other designers |
| RGB | When you need transparency (rgba), or JavaScript color math |
| HSL | Building color scales, theming systems, dynamic color manipulation |
| OKLCH | Modern CSS color systems, perceptual uniformity (emerging standard) |
Building a Color Palette from a Photo
One of the most popular uses of an image color picker is extracting a brand palette from a photograph — a product image, a logo, or a mood board.
The workflow:
- Upload or paste the image into the image color picker
- Sample the key colors — typically 3–5 dominant tones
- Note the HEX codes
- Build your palette with matching tints (lighter HSL values) and shades (darker HSL values)
This technique is used by brand designers, UI teams, and marketers to ensure visual consistency between photography and digital design assets.
Color Accessibility: Contrast Ratios
A color that looks great on your screen might be unreadable for someone with low vision or color blindness. The WCAG (Web Content Accessibility Guidelines) define minimum contrast ratios:
- AA standard: 4.5:1 for normal text, 3:1 for large text
- AAA standard: 7:1 for normal text
Once you have your HEX or RGB values, test them in a contrast checker. If the ratio fails, lighten or darken the background until it passes — HSL makes this easy.
Privacy Note
Color pickers that work from uploaded images are processing visual data from your device. If the image contains sensitive information (documents, faces, proprietary designs), using a cloud-based color picker sends that image to a remote server.
FluxToolkit's color picker and image color picker run entirely in your browser using the HTML5 Canvas API. No images are uploaded or stored.
Frequently Asked Questions
What's the difference between HEX and RGB?
They represent the same color space (sRGB) but in different notations. #6366f1 and rgb(99, 102, 241) are identical colors — just written differently. Use whichever your project or tool expects.
Can I convert between HEX, RGB, and HSL?
Yes — they're all representations of the same underlying color. Any color picker or CSS color converter can translate between them instantly.
Why does the same color look different on different screens?
Screens have different color profiles, brightness, and gamut ranges. A hex code guarantees mathematical consistency but visual perception varies by display. Use calibrated monitors for professional color work.
What is the alpha channel?
Alpha represents transparency. rgba(99, 102, 241, 0.5) is the same color at 50% opacity. hsla() works the same way. HEX also supports 8-digit transparency: #6366f180 (last two digits = alpha).
Does FluxToolkit store my color picks or uploaded images?
No. Everything runs in your browser. No data is sent to our servers.
Related Articles
- WebP vs PNG vs JPG: Which Image Format Should You Use? — Understand image formats alongside color profiles.
- How to Create a Favicon for Your Website — Apply your brand colors when creating favicons.
- How to Compress an Image Online — Optimize images after extracting colors for your palette.