How to change RGB color to HSV

Question

How to change RGB color to HSV  In C  language  I search for very fast method without any external library

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There s a C implementation here   http   www cs rit edu  ncs color t convert html  Should be very straightforward to convert to C   as almost no functions are called - just calculations   found via Google

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This is the VB net version which works fine for me ported from the C code in BlaM s post   There s a C implementation here  http   www cs rit edu  ncs color t convert html Should be very straightforward to convert to C   as almost no functions are called - just  gt  calculations    Public Sub HSVtoRGB ByRef r As Double  ByRef g As Double  ByRef b As Double  ByVal h As Double  ByVal s As Double  ByVal v As Double      Dim i As Integer     Dim f  p  q  t As Double      If  s   0  Then           achromatic  grey          r   v         g   v         b   v         Exit Sub     End If      h    60  sector 0 to 5     i   Math Floor h      f   h - i  factorial part of h     p   v    1 - s      q   v    1 - s   f      t   v    1 - s    1 - f        Select Case  i          Case 0             r   v             g   t             b   p             Exit Select         Case 1             r   q             g   v             b   p             Exit Select         Case 2             r   p             g   v             b   t             Exit Select         Case 3             r   p             g   q             b   v             Exit Select         Case 4             r   t             g   p             b   v             Exit Select         Case Else    case 5              r   v             g   p             b   q             Exit Select     End Select End Sub

User · Answer

Have you considered simply using System Drawing namespace  For example   System Drawing Color color   System Drawing Color FromArgb red  green  blue   float hue   color GetHue    float saturation   color GetSaturation    float lightness   color GetBrightness      Note that it s not exactly what you ve asked for  see differences between HSL and HSV and the Color class does not have a conversion back from HSL HSV but the latter is reasonably easy to add

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The EasyRGB has many color space conversions  Here is the code for the RGB- HSV conversion

User · Answer

There s a C implementation here   http   www cs rit edu  ncs color t convert html  Should be very straightforward to convert to C   as almost no functions are called - just calculations   found via Google

User · Answer

There s a C implementation here   http   www cs rit edu  ncs color t convert html  Should be very straightforward to convert to C   as almost no functions are called - just calculations   found via Google

User · Answer

There s a C implementation here   http   www cs rit edu  ncs color t convert html  Should be very straightforward to convert to C   as almost no functions are called - just calculations   found via Google

User · Answer

FIRST  make sure you have a color as a bitmap  like this   Bitmap bmp    Bitmap pictureBox1 Image Clone    paintcolor   bmp GetPixel e X  e Y      e is from the event handler wich picked my color    What I did when I had this problem a whilke ago  I first got the rgba  red  green  blue and alpha  values   Next I created 3 floats  float hue  float saturation  float brightness  Then you simply do   hue   yourcolor Gethue  saturation   yourcolor GetSaturation  brightness   yourcolor GetBrightness    The whole lot looks like this   Bitmap bmp    Bitmap pictureBox1 Image Clone                paintcolor   bmp GetPixel e X  e Y               float hue              float saturation              float brightness              hue   paintcolor GetHue                saturation   paintcolor GetSaturation                brightness   paintcolor GetBrightness      If you now want to display them in a label  just do   yourlabelname Text   hue ToString  yourlabelname Text   saturation ToString  yourlabelname Text   brightness ToString    Here you go  you now have RGB Values into HSV values     Hope this helps

User · Answer

Have you considered simply using System Drawing namespace  For example   System Drawing Color color   System Drawing Color FromArgb red  green  blue   float hue   color GetHue    float saturation   color GetSaturation    float lightness   color GetBrightness      Note that it s not exactly what you ve asked for  see differences between HSL and HSV and the Color class does not have a conversion back from HSL HSV but the latter is reasonably easy to add

User · Answer

Note that Color GetSaturation   and Color GetBrightness   return HSL values  not HSV  The following code demonstrates the difference   Color original   Color FromArgb 50  120  200      original    Name ff3278c8  ARGB  255  50  120  200    double hue  double saturation  double value  ColorToHSV original  out hue  out saturation  out value      hue          212 0    saturation   0 75    value        0 78431372549019607  Color copy   ColorFromHSV hue  saturation  value      copy    Name ff3278c8  ARGB  255  50  120  200       Compare that to the HSL values that the  NET framework provides   original GetHue              212 0 original GetSaturation       0 6 original GetBrightness       0 490196079   The following C  code is what you want  It converts between RGB and HSV using the algorithms described on Wikipedia  The ranges are 0 - 360 for hue  and 0 - 1 for saturation or value   public static void ColorToHSV Color color  out double hue  out double saturation  out double value        int max   Math Max color R  Math Max color G  color B        int min   Math Min color R  Math Min color G  color B         hue   color GetHue        saturation    max    0    0   1d -  1d   min   max       value   max   255d     public static Color ColorFromHSV double hue  double saturation  double value        int hi   Convert ToInt32 Math Floor hue   60     6      double f   hue   60 - Math Floor hue   60        value   value   255      int v   Convert ToInt32 value       int p   Convert ToInt32 value    1 - saturation        int q   Convert ToInt32 value    1 - f   saturation        int t   Convert ToInt32 value    1 -  1 - f    saturation         if  hi    0          return Color FromArgb 255  v  t  p       else if  hi    1          return Color FromArgb 255  q  v  p       else if  hi    2          return Color FromArgb 255  p  v  t       else if  hi    3          return Color FromArgb 255  p  q  v       else if  hi    4          return Color FromArgb 255  t  p  v       else         return Color FromArgb 255  v  p  q

User · Answer

FIRST  make sure you have a color as a bitmap  like this   Bitmap bmp    Bitmap pictureBox1 Image Clone    paintcolor   bmp GetPixel e X  e Y      e is from the event handler wich picked my color    What I did when I had this problem a whilke ago  I first got the rgba  red  green  blue and alpha  values   Next I created 3 floats  float hue  float saturation  float brightness  Then you simply do   hue   yourcolor Gethue  saturation   yourcolor GetSaturation  brightness   yourcolor GetBrightness    The whole lot looks like this   Bitmap bmp    Bitmap pictureBox1 Image Clone                paintcolor   bmp GetPixel e X  e Y               float hue              float saturation              float brightness              hue   paintcolor GetHue                saturation   paintcolor GetSaturation                brightness   paintcolor GetBrightness      If you now want to display them in a label  just do   yourlabelname Text   hue ToString  yourlabelname Text   saturation ToString  yourlabelname Text   brightness ToString    Here you go  you now have RGB Values into HSV values     Hope this helps

User · Answer

Note that Color GetSaturation   and Color GetBrightness   return HSL values  not HSV  The following code demonstrates the difference   Color original   Color FromArgb 50  120  200      original    Name ff3278c8  ARGB  255  50  120  200    double hue  double saturation  double value  ColorToHSV original  out hue  out saturation  out value      hue          212 0    saturation   0 75    value        0 78431372549019607  Color copy   ColorFromHSV hue  saturation  value      copy    Name ff3278c8  ARGB  255  50  120  200       Compare that to the HSL values that the  NET framework provides   original GetHue              212 0 original GetSaturation       0 6 original GetBrightness       0 490196079   The following C  code is what you want  It converts between RGB and HSV using the algorithms described on Wikipedia  The ranges are 0 - 360 for hue  and 0 - 1 for saturation or value   public static void ColorToHSV Color color  out double hue  out double saturation  out double value        int max   Math Max color R  Math Max color G  color B        int min   Math Min color R  Math Min color G  color B         hue   color GetHue        saturation    max    0    0   1d -  1d   min   max       value   max   255d     public static Color ColorFromHSV double hue  double saturation  double value        int hi   Convert ToInt32 Math Floor hue   60     6      double f   hue   60 - Math Floor hue   60        value   value   255      int v   Convert ToInt32 value       int p   Convert ToInt32 value    1 - saturation        int q   Convert ToInt32 value    1 - f   saturation        int t   Convert ToInt32 value    1 -  1 - f    saturation         if  hi    0          return Color FromArgb 255  v  t  p       else if  hi    1          return Color FromArgb 255  q  v  p       else if  hi    2          return Color FromArgb 255  p  v  t       else if  hi    3          return Color FromArgb 255  p  q  v       else if  hi    4          return Color FromArgb 255  t  p  v       else         return Color FromArgb 255  v  p  q

User · Answer

This is the VB net version which works fine for me ported from the C code in BlaM s post   There s a C implementation here  http   www cs rit edu  ncs color t convert html Should be very straightforward to convert to C   as almost no functions are called - just  gt  calculations    Public Sub HSVtoRGB ByRef r As Double  ByRef g As Double  ByRef b As Double  ByVal h As Double  ByVal s As Double  ByVal v As Double      Dim i As Integer     Dim f  p  q  t As Double      If  s   0  Then           achromatic  grey          r   v         g   v         b   v         Exit Sub     End If      h    60  sector 0 to 5     i   Math Floor h      f   h - i  factorial part of h     p   v    1 - s      q   v    1 - s   f      t   v    1 - s    1 - f        Select Case  i          Case 0             r   v             g   t             b   p             Exit Select         Case 1             r   q             g   v             b   p             Exit Select         Case 2             r   p             g   v             b   t             Exit Select         Case 3             r   p             g   q             b   v             Exit Select         Case 4             r   t             g   p             b   v             Exit Select         Case Else    case 5              r   v             g   p             b   q             Exit Select     End Select End Sub

User · Answer

The EasyRGB has many color space conversions  Here is the code for the RGB- HSV conversion

[c#] How to change RGB color to HSV?

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