Online RGB to HSV Color Converter | Formula & Algorithm

Understanding RGB and HSV Color Models

RGB (Red, Green, Blue) is an additive color model based on mixing light. It's widely used in digital displays. Each color component ranges from 0 to 255.

HSV (Hue, Saturation, Value), also known as HSB (Hue, Saturation, Brightness), represents colors in a cylindrical model, which often aligns better with human perception of color attributes.

• Hue (H): The type of color (like red, blue, or yellow), represented as an angle from 0° to 360°.
• Saturation (S): The intensity or purity of the color (0% is gray, 100% is the most vibrant color).
• Value (V) / Brightness (B): The lightness or darkness of the color (0% is black, 100% is the brightest).

Why Convert RGB to HSV?

Converting RGB to HSV is useful because the HSV model makes it easier to:

• Intuitively select or adjust colors (e.g., changing hue while keeping saturation/value constant), aided by visualizers like the Hue Wheel and SV Box.
• Modify the saturation or brightness of an image independently.
• Analyze colors in image processing tasks.
• Create harmonious color palettes in design applications.

RGB to HSV Conversion: Formula & Algorithm Explained

The conversion relies on a standard algorithm that mathematically maps the RGB color cube onto the HSV cylinder. The core idea of the formula involves finding the maximum (V) and minimum RGB components, calculating the difference (which relates to Saturation), and then determining the Hue based on which component (R, G, or B) is the maximum. Our tool handles this calculation complexity for you.

function rgbToHsv(r, g, b) {
  r /= 255, g /= 255, b /= 255;

  const max = Math.max(r, g, b), min = Math.min(r, g, b);
  let h = 0, s = 0, v = max;

  const d = max - min;
  s = max === 0 ? 0 : d / max;

  if (max !== min) {
    switch (max) {
      case r: h = (g - b) / d + (g < b ? 6 : 0); break;
      case g: h = (b - r) / d + 2; break;
      case b: h = (r - g) / d + 4; break;
    }
    h /= 6;
  }

  // 返回 H (0-360), S (0-100), V (0-100)
  return { 
    h: Math.round(h * 360),
    s: Math.round(s * 100),
    v: Math.round(v * 100)
  };
}

// Example usage:
const rgb = { r: 50, g: 150, b: 200 };
const hsv = rgbToHsv(rgb.r, rgb.g, rgb.b);
console.log(hsv); // { h: 200, s: 75, v: 78 }

import colorsys

def rgb_to_hsv(r, g, b):
  # Normalize RGB values to 0-1 range
  r_norm, g_norm, b_norm = r / 255.0, g / 255.0, b / 255.0
  
  # Convert using colorsys
  h, s, v = colorsys.rgb_to_hsv(r_norm, g_norm, b_norm)
  
  # Convert H to degrees (0-360), S and V to percentage (0-100)
  return {
    'h': round(h * 360),
    's': round(s * 100),
    'v': round(v * 100)
  }

# Example usage:
rgb_color = {'r': 50, 'g': 150, 'b': 200}
hsv_color = rgb_to_hsv(rgb_color['r'], rgb_color['g'], rgb_color['b'])
print(hsv_color) # {'h': 200, 's': 75, 'v': 78}

Practical Applications of HSV

Embed This Tool on Your Website

You can easily embed this RGB to HSV converter directly into your own website or application using the following iframe code:

<iframe 
  src="/tools/rgb-to-hsv-converter?embed=true" 
  width="100%" 
  height="600" 
  style="border:none;border-radius:12px;overflow:hidden;" 
  title="RGB to HSV Color Converter"
></iframe>

Custom Embed Options

You can set the initial color of the embedded tool by adding `r`, `g`, and `b` parameters to the `src` URL (values 0-255). Example:

<iframe 
  src="/tools/rgb-to-hsv-converter?embed=true&r=255&g=100&b=50" 
  width="100%" 
  height="600" 
  style="border:none;border-radius:12px;overflow:hidden;" 
  title="RGB to HSV Color Converter"
></iframe>

Frequently Asked Questions (FAQ)