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How to Generate the Opposite Color of a Given Color?

Nov 19, 2024 pm 09:44 PM

How to Generate the Opposite Color of a Given Color?

Creating the Opposite Color of a Given Color

In this problem, the goal is to generate a color that is the opposite of a given color. The opposite color refers to the dark/bright aspect. For instance, if the given color is black, the opposite color would be white.

To create this opposite color, a function named create_opp_color() is required. This function should accept the current color as an argument and return the opposite color. Here's how to approach this task:

Function Implementation:

  1. Convert HEX to RGB: The given color is assumed to be in HEX format. First, convert it to RGB components.
  2. Invert Color Components: Invert the values of the R, G, and B components (subtract from 255).
  3. Convert Inverted Components to HEX: Convert each inverted component back to HEX values.
  4. Pad Inverted Components: Each HEX component should be padded with zeros to ensure it's a 2-digit HEX value.
  5. Reconstruct HEX Color String: Concatenate the padded HEX components to form the opposite color string.

Implementation in JavaScript:

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function create_opp_color(currentColor) {

    if (currentColor.indexOf('#') === 0) {

        currentColor = currentColor.slice(1);

    }

    if (currentColor.length === 3) {

        currentColor = currentColor.repeat(2);

    }

    const rgb = hexToRgb(currentColor);

    const invertedRgb = {

        r: 255 - rgb.r,

        g: 255 - rgb.g,

        b: 255 - rgb.b

    };

    const invertedHex = rgbToHex(invertedRgb);

    return '#' + invertedHex;

}

 

function rgbToHex(rgb) {

    let hex = '';

    for (const key in rgb) {

        if (rgb.hasOwnProperty(key)) {

            const component = rgb[key].toString(16);

            hex += component.length === 1 ? '0' + component : component;

        }

    }

    return hex;

}

 

function hexToRgb(hex) {

    let rgb = {};

    ['r', 'g', 'b'].forEach((key, i) => {

        rgb[key] = parseInt(hex.substr(i * 2, 2), 16);

    });

    return rgb;

}

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Advanced Technique:

If you need more contrast, you can utilize black or white as the opposite color based on the brightness of the original color. Here's a modified function to do that:

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function create_opp_color(currentColor) {

    if (currentColor.indexOf('#') === 0) {

        currentColor = currentColor.slice(1);

    }

    if (currentColor.length === 3) {

        currentColor = currentColor.repeat(2);

    }

    const rgb = hexToRgb(currentColor);

    const brightness = Math.round((rgb.r * 0.299 + rgb.g * 0.587 + rgb.b * 0.114) / 255 * 100);

 

    return brightness > 50 ? '#000000' : '#FFFFFF';

}

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Now, using this function, you can easily generate the opposite color of any given color, whether it is bright or dark.

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