How to get the Color Code in RGB Hex from RGBA? (Unity 3D 5.0f1)

Question

I actually got stuck at this point where I'm doing the following and to get color code in RGB Hex from Unity Color

loading an image from camera into a RawImage.texture as Texture2D which displays just fine.(there is no material set to RawImage but it has solid white color in the start)
then i am using my touched position(using Input.GetButtonDown("Fire1") and Input.mousePosition ) on the image as coordinates into my_texture.GetPixel(x,y);

But the color code convertion which i applied gave me always #010101 which translates to black on online color converters.

             Texture2D my_texture = RawImageEnlarge.texture as Texture2D;
     
             int x = (int)my_position.x;
             int y = (int)my_position.y;
     
             Color my_color = my_texture.GetPixel(x, y);
             //TODO must remove after testing ------
     
             //blend alpha : converting argb to rgb 
             Color blend = Color.white; 
             int alpha = (int)my_color.a;
             int r = (int)((alpha/255)*my_color.r + (1 - alpha/255)*blend.r);
             int g = (int)((alpha/255)*my_color.g + (1 - alpha/255)*blend.g);
             int b = (int)((alpha/255)*my_color.b + (1 - alpha/255)*blend.b);
     
     
             string hexCC = "#"+r.ToString("X2") + g.ToString("X2") + b.ToString("X2");
     
     //OR //string hexCC = UnityEngine.ColorUtility.ToHtmlStringRGB(my_color); //unity does not recognize ColorUtility class :/

Answer 1

Answer by franktinsley · Mar 02, 2017 at 01:02 AM

You guys are all trying way too hard. Just use ColorUtility.ToHtmlStringRGB( myColor ) and get on with it.

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PizzaProgram · Apr 05, 2017 at 04:31 PM 2

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To be exact: ColorUtility.ToHtmlStringRGBA( myColor ) RGBA ... not just RGB :)

MI_Buddy PizzaProgram · Oct 20, 2017 at 04:46 PM 4

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For others who come by, they're both options:

RGB: https://docs.unity3d.com/ScriptReference/ColorUtility.ToHtmlStringRGB.html

RGBA: https://docs.unity3d.com/ScriptReference/ColorUtility.ToHtmlStringRGBA.html

mrCrush · Feb 03, 2018 at 12:15 PM 1

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Thanks a lot!

Zengon · Nov 13, 2019 at 09:20 PM 1

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Looked everywhere and all I've been seeing is confusing methods, formulas and conversions. You're a life saver, thank you!

Answer 2

So, here's a basic example that may work. I have not tested all possible values of color channels, but I tested each channel, not a number, positive and negative infinity, alpha etc, to make sure the output stays within #000000 to #FFFFFF and doesn't throw exceptions. You may wish different behaviour for negative, positive infinity or not a number cases perhaps, but this is up to what makes sense to you. In most cases, you won't be feeding those values into any channel anyway.

 using UnityEngine;
 
 public static class ColorTypeConverter
 {
     public static string ToRGBHex(Color c)
     {
         return string.Format("#{0:X2}{1:X2}{2:X2}", ToByte(c.r), ToByte(c.g), ToByte(c.b));
     }
 
     private static byte ToByte(float f)
     {
         f = Mathf.Clamp01(f);
         return (byte)(f * 255);
     }
 }

And the tests for reference.

 using NUnit.Framework;
 using UnityEngine;
 
 [TestFixture]
 [Category("Type Conversion")]
 internal class ColorTypeConverterTests
 {
     [Test]
     public void ConvertsCommonColors()
     {
         Assert.AreEqual("#000000", ColorTypeConverter.ToRGBHex(Color.black));
         Assert.AreEqual("#FFFFFF", ColorTypeConverter.ToRGBHex(Color.white));
     }
 
     [Test]
     public void IgnoresAlphaChannel()
     {
         Assert.AreEqual("#FFFFFF", ColorTypeConverter.ToRGBHex(new Color(1, 1, 1, 0)));
         Assert.AreEqual("#FFFFFF", ColorTypeConverter.ToRGBHex(new Color(1, 1, 1, 1)));
     }
 
     [Test]
     public void ConvertsChannelsInRGBOrder()
     {
         Assert.AreEqual("#FF0000", ColorTypeConverter.ToRGBHex(Color.red));
         Assert.AreEqual("#00FF00", ColorTypeConverter.ToRGBHex(Color.green));
         Assert.AreEqual("#0000FF", ColorTypeConverter.ToRGBHex(Color.blue));
     }
 
     [Test]
     public void ConvertsYellow()
     {
         UnityYellowIsKnown();
         Assert.AreEqual("#FFEB04", ColorTypeConverter.ToRGBHex(Color.yellow));
     }
 
     [Test]
     public void UnityYellowIsKnown()
     {
         // ConvertsYellow use yellow color. If Unity changes the definition of 
         // yellow, those tests will fail. To spare developer confusion about 
         // failing tests, assert that the channels are known. Because the channels
         // are so arbitrary, it's also nice to see the floats in plain text.
         Assert.AreEqual(1, Color.yellow.r, "Color.yellow.r changed");
         Assert.AreEqual(0.921568632f, Color.yellow.g, "Color.yellow.g changed");
         Assert.AreEqual(0.0156862754f, Color.yellow.b, "Color.yellow.b changed");
     }
 
     [Test]
     public void ClampsChannelsBetweenZeroAndOne()
     {
         Assert.AreEqual("#FFFFFF", ColorTypeConverter.ToRGBHex(PosInf()));
         Assert.AreEqual("#FFFFFF", ColorTypeConverter.ToRGBHex(Fill(1.5f)));
         Assert.AreEqual("#FFFFFF", ColorTypeConverter.ToRGBHex(Fill(1)));
         Assert.AreEqual("#000000", ColorTypeConverter.ToRGBHex(Fill(0)));
         Assert.AreEqual("#000000", ColorTypeConverter.ToRGBHex(Fill(-0.5f)));
         Assert.AreEqual("#000000", ColorTypeConverter.ToRGBHex(NegInf()));
     }
 
     [Test]
     public void NotANumberConvertsToBlack()
     {
         Assert.AreEqual("#000000", ColorTypeConverter.ToRGBHex(NaN()));
     }
 
     private static Color NaN()
     {
         return Fill(float.NaN);
     }
 
     private static Color NegInf()
     {
         return Fill(float.NegativeInfinity);
     }
 
     private static Color PosInf()
     {
         return Fill(float.PositiveInfinity);
     }
 
     private static Color Fill(float c)
     {
         return new Color(c, c, c, c);
     }
 }

Answer 3

Answer by jk24777 · Nov 24, 2015 at 04:07 PM

I was able to get this working but I think its not giving me correct color code. i cant patch it up. Help highly apreciated!

         Texture2D t2d = RawImageEnlarge.texture as Texture2D;
         int x = (int)ClickedPosition.x;
         int y = (int)ClickedPosition.y;
         //(RawImageEnlarge.texture as Texture2D).format = TextureFormat.RGB24;
 
         Color my_color = (t2d).GetPixel(x, y);
         Color32 myyyy_color = my_color;
         Debug.Log ("MYY COLOR: "+my_color);
         Debug.Log ("MYYYYYY COLOR: "+myyyy_color);
         //TODO must remove after testing ------
 
         //blend alpha : converting argb to rgb 
         Color blend = Color.white; 
         int alpha = (int)myyyy_color.a;
         int r = (int)((alpha/255)*myyyy_color.r + (1 - alpha/255)*blend.r);
         int g = (int)((alpha/255)*myyyy_color.g + (1 - alpha/255)*blend.g);
         int b = (int)((alpha/255)*myyyy_color.b + (1 - alpha/255)*blend.b);
 
         //                        OR                       // now working atm
         //ColorTranslator.ToHtml (Color.FromArgb (Color.Tomato.ToArgb ()));
 
         string hexCC = "#"+r.ToString("X2") + g.ToString("X2") + b.ToString("X2");
         
             //string hexCC = ColorUtility.ToHtmlStringRGB(my_color);
         
         ColorCodeCC.text = hexCC;

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ExamplesAreExamples · Nov 24, 2015 at 09:37 PM 0

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Extract the color/hexadecimal conversion code into standalone function.

Then write a unit test for the conversion function.

$$anonymous$$ake the unit test simple, like

 // Test that white is returned as #FFFFFF
 Assert.AreEqual("#FFFFFF", ColorConverter.ToRGBHex(new Color(1, 1, 1, 0));
 
 // Test that alpha doesn't affect basic output
 Assert.AreEqual("#000000", ColorConverter.ToRGBHex(new Color(0, 0, 0, 1));
 Assert.AreEqual("#FFFFFF", ColorConverter.ToRGBHex(new Color(1, 1, 1, 1));
 
 // Test that components go into the right characters in the string
 Assert.AreEqual("#FF0000", ColorConverter.ToRGBHex(new Color(1, 0, 0, 0));
 Assert.AreEqual("#00FF00", ColorConverter.ToRGBHex(new Color(0, 1, 0, 0));
 Assert.AreEqual("#0000FF", ColorConverter.ToRGBHex(new Color(0, 0, 1, 0));

 // I am sure you can think of more tests, as you go along or if you find bugs.

Feel free to break it up into separate tests if you don't like to have them all in one method.

You can get Unity Test Tools for free from the Asset Store. It's okay, but I recommend you remove the examples after giving it a spin, because they fail on purpose to demonstrate some examples that it ships with. It's annoying to have examples running along with your real tests - especially as they fail.

Answer 4

Answer by Refzlund · Mar 09, 2019 at 04:54 PM

Hey,

To convert Unity Color (RGB) to HEX code, it has to be an Int32.

 // C#
 Color color = new Color(69, 12,  65);
 int r = (int)color.r, g = (int)color.g, b = (int)color.b;
 string _color = r.ToString("X2") + g.ToString("X2") + b.ToString("X2");

Best regards, Arthur

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How to get the Color Code in RGB Hex from RGBA? (Unity 3D 5.0f1)

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