NSColor |从RGB值创建颜色 [英] NSColor | Creating Color from RGB Values

问题描述

在我的应用程序中，我将获得RGB值作为无符号字符，因此不会超过255，我正在使用NSColor API创建颜色，并将使用它来绘制字体和背景色，

这是我编写的功能

  +(NSColor *)getColorFromRGB:(unsigned char)r蓝色:(unsigned char)b绿色:(unsigned char)g{CGFloat rFloat = r/255.0;CGFloat gFloat = g/255.0;CGFloat bFloat = b/255.0;//返回[NSColor colorWithCalibratedRed:((float)r/255.0)green:((float)g/255.0)blue:((float)b/255.0)alpha:1.0];返回[NSColor colorWithCalibratedRed:rFloat绿色:gFloat蓝色:bFloat alpha:1.0]；} 

几乎在所有情况下，当我使用RGB色板中的RGB值比较颜色时，颜色都不匹配，例如，当我通过时，

r = 187，g = 170，b = 170，

它应该绘制浅灰色，但是在这种情况下，我会得到完全白色的颜色

任何人都有一个主意，我在做什么错了，

亲切的问候

罗汉

解决方案

如果要从255个输入组件中传递输入数据，并且出于安全考虑，希望将其限制在255个以内，则可以尝试以下操作:

p CGFloat rFloat = r 255.0;CGFloat gFloat = g％255.0;CGFloat bFloat = b％255.0;

而不是除以％值.

In my application, i will get RGB Values as a unsigned character so it will not be more then 255, I am using NSColor API to create the color and will make use of it to draw the font and background color,

this is the function that i have written

+(NSColor *)getColorFromRGB:(unsigned char)r blue:(unsigned char)b green:(unsigned char)g
{
    CGFloat rFloat = r/255.0;
    CGFloat gFloat = g/255.0;
    CGFloat bFloat = b/255.0;

    //  return [NSColor colorWithCalibratedRed:((float)r/255.0) green:((float)g/255.0) blue:((float)b/255.0) alpha:1.0];
    return [NSColor colorWithCalibratedRed:rFloat green:gFloat blue:bFloat alpha:1.0];
}

In almost all case, when i compare the Color using my RGB Value in RGB palate, color is not matching, For example, when i pass ,

r = 187, g = 170, b = 170,

It should draw the light gray, but i am getting complete whilte color, in this case,

anyone has an idea, what i am doing wrong,

Kind Regards

Rohan

解决方案

If you are passing the input components out of 255 and you want to restrict it within 255 for safety purpose, you can try this:

CGFloat rFloat = r % 255.0; CGFloat gFloat = g % 255.0; CGFloat bFloat = b % 255.0;

Instead of divide use % value.

这篇关于NSColor |从RGB值创建颜色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！