相关疑难解决方法(0)

我想将现有颜色变暗以用于渐变画笔.请问有人告诉我该怎么做？

C#,.net 2.0,GDI +

  Color AdjustBrightness(Color c1, float factor)
    {

        float r = ((c1.R * factor) > 255) ? 255 : (c1.R * factor);
        float g = ((c1.G * factor) > 255) ? 255 : (c1.G * factor);
        float b = ((c1.B * factor) > 255) ? 255 : (c1.B * factor);

        Color c  = Color.FromArgb(c1.A,(int)r, (int)g, (int)b);
        return c ;

    }

我正在尝试将HSB颜色转换为RGB.我这样做的方式是

System.Windows.Media.Color winColor = value;
System.Drawing.Color drawColor = System.Drawing.Color.FromArgb(winColor.R, winColor.G, winColor.B);
Hue = (byte)(drawColor.GetHue()*255);
Saturation = (byte)(drawColor.GetSaturation()*255);
Luminosity = (byte)(drawColor.GetBrightness()*255);

我发现,当我有FF0000,它将被转换为H = 0, S = 255, L = 127转换为RGB FF0E0E.我觉得Luminosity应该是120？或者我是否让整个HSB错误？当我在Photoshop中查看颜色选择器时,Hue为0-360度,饱和度,亮度为0-100%.我的HSB值介于0到255之间,我做错了吗？

与此类似(如何增加亮度)我想改变RGB(十六进制)颜色的色调.

说changeHue("#FF0000", 40)回报"#FFAA00"

如何将这种计算方式更改为较暗而不是较亮的颜色？

function increase_brightness(hex, percent){
    // strip the leading # if it's there
    hex = hex.replace(/^\s*#|\s*$/g, '');

    // convert 3 char codes --> 6, e.g. `E0F` --> `EE00FF`
    if(hex.length == 3){
        hex = hex.replace(/(.)/g, '$1$1');
    }

    var r = parseInt(hex.substr(0, 2), 16),
        g = parseInt(hex.substr(2, 2), 16),
        b = parseInt(hex.substr(4, 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) + …