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copied!<p>You could install <a href="http://bravobug.com/news/?p=448" rel="nofollow noreferrer">this Category</a> for extending <code>UIColor</code> for knowing HSV/HSB and compare <code>[aUIColor brightness]</code></p> <p>Edit:<br> I found the same code in some <a href="https://github.com/davidblackuk/Dashboards/blob/a8bb2d0bb7103782042107919192712602d29de9/IOSDashBoards/IOSDashBoards/UIColor-HSVAdditions.m" rel="nofollow noreferrer">github-hosted project</a>, made a gist of it: <a href="https://gist.github.com/1252197" rel="nofollow noreferrer">https://gist.github.com/1252197</a></p> <hr> <pre><code>#import "UIColor-HSVAdditions.h" @implementation UIColor (UIColor_HSVAdditions) +(struct hsv_color)HSVfromRGB:(struct rgb_color)rgb { struct hsv_color hsv; CGFloat rgb_min, rgb_max; rgb_min = MIN3(rgb.r, rgb.g, rgb.b); rgb_max = MAX3(rgb.r, rgb.g, rgb.b); hsv.val = rgb_max; if (hsv.val == 0) { hsv.hue = hsv.sat = 0; return hsv; } rgb.r /= hsv.val; rgb.g /= hsv.val; rgb.b /= hsv.val; rgb_min = MIN3(rgb.r, rgb.g, rgb.b); rgb_max = MAX3(rgb.r, rgb.g, rgb.b); hsv.sat = rgb_max - rgb_min; if (hsv.sat == 0) { hsv.hue = 0; return hsv; } if (rgb_max == rgb.r) { hsv.hue = 0.0 + 60.0*(rgb.g - rgb.b); if (hsv.hue < 0.0) { hsv.hue += 360.0; } } else if (rgb_max == rgb.g) { hsv.hue = 120.0 + 60.0*(rgb.b - rgb.r); } else /* rgb_max == rgb.b */ { hsv.hue = 240.0 + 60.0*(rgb.r - rgb.g); } return hsv; } -(CGFloat)hue { struct hsv_color hsv; struct rgb_color rgb; rgb.r = [self red]; rgb.g = [self green]; rgb.b = [self blue]; hsv = [UIColor HSVfromRGB: rgb]; return (hsv.hue / 360.0); } -(CGFloat)saturation { struct hsv_color hsv; struct rgb_color rgb; rgb.r = [self red]; rgb.g = [self green]; rgb.b = [self blue]; hsv = [UIColor HSVfromRGB: rgb]; return hsv.sat; } -(CGFloat)brightness { struct hsv_color hsv; struct rgb_color rgb; rgb.r = [self red]; rgb.g = [self green]; rgb.b = [self blue]; hsv = [UIColor HSVfromRGB: rgb]; return hsv.val; } -(CGFloat)value { return [self brightness]; } @end </code></pre>

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