CODEWITHSUNDEEP
javascriptjqueryhexbrightness
Filippo oretti
Filippo oretti

Reputation: 49813

JAVASCRIPT brightness function - decrease

i founded this piece of code here on stack:

function increase_brightness(hex, percent){
    var r = parseInt(hex.substr(1, 2), 16),
        g = parseInt(hex.substr(3, 2), 16),
        b = parseInt(hex.substr(5, 2), 16);

    return '#' +
       ((0|(1<<8) + r + (256 - r) * percent / 100).toString(16)).substr(1) +
       ((0|(1<<8) + g + (256 - g) * percent / 100).toString(16)).substr(1) +
       ((0|(1<<8) + b + (256 - b) * percent / 100).toString(16)).substr(1);
}

does anyone knows how to make the exactly inverse?

function decreas_brightness(){} i mean

Upvotes: 1

Views: 1705

Answers (1)

Kelvin
Kelvin

Reputation: 5307

Your code is from JavaScript Calculate brighter colour. According to the comments, the following change should make it decrease brightness:

function decrease_brightness(hex, percent){
    var r = parseInt(hex.substr(1, 2), 16),
        g = parseInt(hex.substr(3, 2), 16),
        b = parseInt(hex.substr(5, 2), 16);

   return '#' +
       ((0|(1<<8) + r * (100 - percent) / 100).toString(16)).substr(1) +
       ((0|(1<<8) + g * (100 - percent) / 100).toString(16)).substr(1) +
       ((0|(1<<8) + b * (100 - percent) / 100).toString(16)).substr(1);
}

Upvotes: 1

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