Mega Code Archive
How to Convert RGB Color to HSB (HSV) Color
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Title: How to Convert RGB Color to HSB (HSV) Color
The HSV (Hue, Saturation, Value) model, also called HSB (Hue, Saturation, Brightness), defines a color space commonly used in graphics applications. Hue value ranges from 0 to 360, Saturation and Brightness values range from 0 to 100%.
The RGB (Red, Green, Blue) is also used, primarily in web design. When written, RGB values are commonly specified using three integers between 0 and 255, each representing red, green, and blue intensities.
Here's a function to convert a RGB color to a HSV color.
uses Math;
type
TRGBColor = record
Red,
Green,
Blue : Byte;
end;
THSBColor = record
Hue,
Saturnation,
Brightness : Double;
end;
function RGBToHSB(rgb : TRGBColor) : THSBColor;
var
minRGB, maxRGB, delta : Double;
h , s , b : Double ;
begin
H := 0.0 ;
minRGB := Min(Min(rgb.Red, rgb.Green), rgb.Blue) ;
maxRGB := Max(Max(rgb.Red, rgb.Green), rgb.Blue) ;
delta := ( maxRGB - minRGB ) ;
b := maxRGB ;
if (maxRGB 0.0) then s := 255.0 * Delta / maxRGB
else s := 0.0;
if (s 0.0) then
begin
if rgb.Red = maxRGB then h := (rgb.Green - rgb.Blue) / Delta
else
if rgb.Green = maxRGB then h := 2.0 + (rgb.Blue - rgb.Red) / Delta
else
if rgb.Blue = maxRGB then h := 4.0 + (rgb.Red - rgb.Green) / Delta
end
else h := -1.0;
h := h * 60 ;
if h then h := h + 360.0;
with result do
begin
Hue := h;
Saturnation := s * 100 / 255;
Brightness := b * 100 / 255;
end;
end;
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