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Make Color Lighter? RRS feed

  • Question

  • Hey guys,

    I have a color...let's just say #FFDFE4F4 and I'd like to make the color lighter (ie. same color but gradually closer to white) so I can assemble a LinearGradientBrush for various controls. I wish to do so programatically starting with a single based color...is there any way to make it programatically lighter? I tried just reducing the RGB values by a flat percentage but that didn't do it and using alpha isn't an option because the background will be the same as the base color.  Anyone have any ideas?

    Aj


    If at first you don't succeed, skydiving is definitely not for you!
    Friday, June 11, 2010 4:15 PM

Answers

  • 		public static Color InterpolateColors(Color color1, Color color2, float percentage)
    		{
    			double a1 = color1.A / 255.0, r1 = color1.R / 255.0, g1 = color1.G / 255.0, b1 = color1.B / 255.0;
    			double a2 = color2.A / 255.0, r2 = color2.R / 255.0, g2 = color2.G / 255.0, b2 = color2.B / 255.0;
    
    			byte a3 = Convert.ToByte((a1 + (a2 - a1) * percentage) * 255);
    			byte r3 = Convert.ToByte((r1 + (r2 - r1) * percentage) * 255);
    			byte g3 = Convert.ToByte((g1 + (g2 - g1) * percentage) * 255);
    			byte b3 = Convert.ToByte((b1 + (b2 - b1) * percentage) * 255);
    			return Color.FromArgb(a3, r3, g3, b3);
    		}
    

    Controls for WPF, Windows Forms and Silverlight at http://www.divelements.co.uk
    • Marked as answer by aaj23 Friday, June 11, 2010 6:07 PM
    Friday, June 11, 2010 4:53 PM
  • I recently wrote an article on how to make a color lighter or darker in C#. The idea is to increase/decrease the red, green and blue components of the color value. You can find the full article and the source code at:

    Make Color Lighter or Darker in C#

    • Marked as answer by aaj23 Monday, September 24, 2012 12:47 PM
    Monday, September 24, 2012 9:11 AM

All replies

  • Here is some code I used to create a random GradientBrush:

      public static class Utilities
      {
        #region Private Fields
        private static readonly Random _Random = new Random(Environment.TickCount);
        #endregion
    
        #region Public Methods
        public static T CreateGradientBrush<T>(Color color1, Color color2, Color color3) where T : GradientBrush, new()
        {
          return new T
                {
                  GradientStops = new GradientStopCollection(3)
                            {
                              new GradientStop(color1, 0),
                              new GradientStop(color2, 0.531),
                              new GradientStop(color3, 1),
                            }
                };
    
        }
    
        public static void FixMinMax(ref int minValue, ref int maxValue)
        {
          if (minValue > maxValue)
          {
            int x = minValue;
            minValue = maxValue;
            maxValue = x;
          }
        }
    
        public static T RandomGradientBrush<T>() where T: GradientBrush, new()
        {
          const int firstPass = 25;
          const int secondPass = 60;
    
          int blue = RandomNext(secondPass, 256);
          int green = RandomNext(secondPass, 256);
          int red = RandomNext(secondPass, 256);
    
          return CreateGradientBrush<T>(Color.FromRgb((byte)red, (byte)green, (byte)blue), Color.FromRgb((byte)(red - firstPass), (byte)(green - firstPass), (byte)(blue - firstPass)), Color.FromRgb((byte)(red - secondPass), (byte)(green - secondPass), (byte)(blue - secondPass)));
        }
    
        public static int RandomNext(int minValue, int maxValue)
        {
          return _Random.Next(minValue, maxValue);
        }
    
        public static SolidColorBrush RandomSolidColorBrush()
        {
          int blue = RandomNext(0, 256);
          int green = RandomNext(0, 256);
          int red = RandomNext(0, 256);
    
          return new SolidColorBrush(Color.FromRgb((byte)red, (byte)green, (byte)blue));
        }
        #endregion
      }
    
    It sounds very similiar to what you already tried though so I'm not sure if it will work for you. Tweak 'firstPass' and 'secondPass' in 'RandomGradientBrush' to adjust how much the colors will shift.
    Friday, June 11, 2010 4:27 PM
  • aaj23,

    Just my two cents: When I try to make SAME COLORs lighter, I just reduce the ALPHA for the Color. It is the Color.A Property FF is brightest and 00 is the lightest. You can see that as the first two bytes in the Color when shown in Hex such as "#FF ACACAC" vs "#33 ACACAC".

    Hope this will be an easier solution.


    noorbakhsh حميد نوربخش
    Friday, June 11, 2010 4:41 PM
  • 		public static Color InterpolateColors(Color color1, Color color2, float percentage)
    		{
    			double a1 = color1.A / 255.0, r1 = color1.R / 255.0, g1 = color1.G / 255.0, b1 = color1.B / 255.0;
    			double a2 = color2.A / 255.0, r2 = color2.R / 255.0, g2 = color2.G / 255.0, b2 = color2.B / 255.0;
    
    			byte a3 = Convert.ToByte((a1 + (a2 - a1) * percentage) * 255);
    			byte r3 = Convert.ToByte((r1 + (r2 - r1) * percentage) * 255);
    			byte g3 = Convert.ToByte((g1 + (g2 - g1) * percentage) * 255);
    			byte b3 = Convert.ToByte((b1 + (b2 - b1) * percentage) * 255);
    			return Color.FromArgb(a3, r3, g3, b3);
    		}
    

    Controls for WPF, Windows Forms and Silverlight at http://www.divelements.co.uk
    • Marked as answer by aaj23 Friday, June 11, 2010 6:07 PM
    Friday, June 11, 2010 4:53 PM
  • aaj23,

    Just my two cents: When I try to make SAME COLORs lighter, I just reduce the ALPHA for the Color. It is the Color.A Property FF is brightest and 00 is the lightest. You can see that as the first two bytes in the Color when shown in Hex such as "#FF ACACAC" vs "#33 ACACAC".

    Hope this will be an easier solution.


    noorbakhsh حميد نوربخش


    Thanks for the tip, and actually that's how I would do it as well, but as I mentioned in my original post, using Alpha isn't an option because my background color could be the same color (might even be like black), thus altering the alpha of a brush on top of the exact same color yields no result or possibly the opposite result I want...if my background were black it would make the same color darker if you gradually decrease the alpha.

     


    If at first you don't succeed, skydiving is definitely not for you!
    Friday, June 11, 2010 6:06 PM
  • 		public
     static
     Color InterpolateColors(Color color1, Color color2, float
     percentage)
    		{
    			double
     a1 = color1.A / 255.0, r1 = color1.R / 255.0, g1 = color1.G / 255.0, b1 = color1.B / 255.0;
    			double
     a2 = color2.A / 255.0, r2 = color2.R / 255.0, g2 = color2.G / 255.0, b2 = color2.B / 255.0;
    
    			byte
     a3 = Convert.ToByte((a1 + (a2 - a1) * percentage) * 255);
    			byte
     r3 = Convert.ToByte((r1 + (r2 - r1) * percentage) * 255);
    			byte
     g3 = Convert.ToByte((g1 + (g2 - g1) * percentage) * 255);
    			byte
     b3 = Convert.ToByte((b1 + (b2 - b1) * percentage) * 255);
    			return
     Color.FromArgb(a3, r3, g3, b3);
    		}
    
    

    Controls for WPF, Windows Forms and Silverlight at http://www.divelements.co.uk


    That's exactly what I was looking for!  Thank you!

    Aj


    If at first you don't succeed, skydiving is definitely not for you!
    Friday, June 11, 2010 6:07 PM
  • Thanks Cory, I'll keep that code for something cool I may use later on, but the solution that Tim came up with was a little more what I was looking for. Thank you for your input!

     

    Thanks!

    Aj

    • Proposed as answer by Timgy Thursday, April 5, 2018 1:03 PM
    Friday, June 11, 2010 6:09 PM
  • #FFDFE4F4 is ARGB

    increase the RGB. That will make it lighter. Do not alter the Alpha which is the FF.

     


    bfxtech.com
    Friday, June 11, 2010 6:51 PM
  • I recently wrote an article on how to make a color lighter or darker in C#. The idea is to increase/decrease the red, green and blue components of the color value. You can find the full article and the source code at:

    Make Color Lighter or Darker in C#

    • Marked as answer by aaj23 Monday, September 24, 2012 12:47 PM
    Monday, September 24, 2012 9:11 AM
  • I recently wrote an article on how to make a color lighter or darker in C#. The idea is to increase/decrease the red, green and blue components of the color value. You can find the full article and the source code at:

    Make Color Lighter or Darker in C#


    Indeed that's a good solution...pretty far past that project, but I marked it as an answer in case someone stubles across this.  Thanks for the solution!

    If at first you don't succeed, skydiving is definitely not for you!

    Monday, September 24, 2012 12:48 PM