Get Color Name by Hex or Rgb

Get color name by HEX or RGB

You can use Name that Color.

Example:

let result = ntc.name('#6195ed');

let rgb_value = result[0];      // #6495ed         : RGB value of closest match
let specific_name = result[1];  // Cornflower Blue : Color name of closest match
let is_exact_match = result[2]; // false           : True if exact color match

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There is also a variation of Name that Color that includes additional parameters:

http://www.color-blindness.com/color-name-hue-tool/js/ntc.js

Example:

let result = ntc.name('#6195ed');

let rgb_value = result[0];      // #6495ed         : RGB value of closest match
let specific_name = result[1];  // Cornflower Blue : Color name of closest match
let shade_value = result[2];    // #0000ff         : RGB value of shade of closest match
let shade_name = result[3];     // Blue            : Color name of shade of closest match
let is_exact_match = result[4]; // false           : True if exact color match

From hex color code or RGB to color name using R

Approach is similar to @Richard Ambler's solution to compare distance between test rgb vector and
expansive set of colour mapping from output of colours().

The function rgb2col below with given test rgb values returns approximate matching colour name

Data:

library(scales) #for function show_col

DF = read.table(text="Color Count red green blue
 ED1B24 16774 237    27   36
 000000 11600   0     0    0
 23B14D  5427  35   177   77
 FFFFFF  5206 255   255  255
 FEF200  3216 254   242    0
 ED1B26   344 237    27   38",header=TRUE,stringsAsFactors=FALSE)

 #from https://gist.github.com/mbannert/e9fcfa86de3b06068c83

 rgb2hex <- function(r,g,b) rgb(r, g, b, maxColorValue = 255)

Function:

 rgb2col = function(r,g,b) {

 #create colour name vs. rgb mapping table 
 colourMap = data.frame(colourNames = colours(),t(col2rgb(colours())))

 #input test colours
 testDF = data.frame(colourNames="testCol",red = r,green = g,blue = b)

 #combine both tables
 combDF = rbind(testDF,colourMap)

 #convert in matrix representation 
 combMat= (as.matrix(combDF[,-1]))

 #add row labels as colour names
 rownames(combMat) = combDF[,1]

 #compute euclidean distance between test rgb vector and all the colours
 #from mapping table 
 #using dist function compute distance matrix,retain only upper matrix
 #find minimum distance point from test vector

 #find closest matching colour name
 approxMatchCol = which.min(as.matrix(dist(combMat,upper=TRUE))[1,][-1])

 #compare test colour with approximate matching colour
 scales::show_col(c(rgb2hex(r,g,b),rgb2hex(colourMap[approxMatchCol,2:4])))

 #return colour name
 return(approxMatchCol)

 }

Output:

sapply(1:nrow(DF),function(x) rgb2col(DF[x,"red"],DF[x,"green"],DF[x,"blue"]))
#firebrick2      black   seagreen      white     yellow firebrick2 
#       135         24        574          1        652        135 

Plots:

How could I get a hex code when I give a color name

The other answers are fine. If you're looking for a gem that's already done the work for you, though, take a look at Color. Its Color::CSS[] method looks up a color by name and returns a Color::RGB object, which in turn has hex and html methods:

require "color"

aliceblue = Color::CSS["aliceblue"]
puts aliceblue.hex
# => f0f8ff
puts aliceblue.html
# => #f0f8ff

Color::RGB also has a by_hex static method, which will return a named Color::RGB object for the given hex code. The name method returns the name (if it has one):

require "color"

mystery_color = Color::RGB.by_hex("#ffefd5")
puts mystery_color.name
# => papayawhip

You can see it in action on repl.it: https://repl.it/@jrunning/EqualReasonableSpellchecker (If you get an error the first time you hit the run button, hit it again. repl.it sometimes has trouble with loading gems the first time.)

Convert hex color code to color name

You may use the convenience function color.id from the plotrix package*:

Given a color specified as a hex string, find the closest match in the table of known (named) colors.

library(plotrix)
sapply(rainbow(4), color.id)
# $`#FF0000FF`
# [1] "red"  "red1"
# 
# $`#80FF00FF`
# [1] "chartreuse"  "chartreuse1"
# 
# $`#00FFFFFF`
# [1] "cyan"  "cyan1"
# 
# $`#8000FFFF`
# [1] "purple"

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*Credits to Jim Lemon and his answer here: Convert color hex code to color names.

Get near or equivalent color name from hex decimal value windows apps

Here is my solution:

Firstly, I made a custom Class:

public class ColorReference
{
        public string Name { get; set; }
        public Vector3 Argb { get; set; }
}

This is to construct the known color which get from this site

private static ColorReference[] GetColorReferences()
{
            return new ColorReference[] {
                new ColorReference() { Name="AliceBlue", Argb=new Vector3 (
240,248,255) },
                new ColorReference() { Name="LightSalmon", Argb=new Vector3 (

255,160,122) },
        ......
        };
}

Secondly, I treat these Vectors as three-dimensional vectors, for a single vector, I can get the closest one based on Vector3.Distance method.

private static ColorReference GetClosestColor(ColorReference[] colorReferences, Vector3 currentColor)
{
            ColorReference tMin = null;
            float minDist = float.PositiveInfinity;

            foreach (ColorReference t in colorReferences)
            {
                float dist = Vector3.Distance(t.Argb, currentColor);
                if (dist < minDist)
                {
                    tMin = t;
                    minDist = dist;
                }
            }
            return tMin;
}

Use the above method to get the nearest color's name:

public static string GetNearestColorName(Vector3 vect)
        {
            var cr = GetClosestColor(GetColorReferences(), vect);
            if( cr != null )
            {
                return cr.Name;
            }
            else
                return string.Empty;
        }

Also need this method to extract argb value from hex demical value:

public static Vector3 GetSystemDrawingColorFromHexString(string hexString)
        {
            if (!System.Text.RegularExpressions.Regex.IsMatch(hexString, @"[#]([0-9]|[a-f]|[A-F]){6}\b"))
                throw new ArgumentException();
            int red = int.Parse(hexString.Substring(1, 2), NumberStyles.HexNumber);
            int green = int.Parse(hexString.Substring(3, 2), NumberStyles.HexNumber);
            int blue = int.Parse(hexString.Substring(5, 2), NumberStyles.HexNumber);
            return new Vector3(red, green, blue);
        }

Screenshot:

Check my completed demo from here: Github Link

----------Update 07/26/2016--------

For Windows/Phone 8.1, because the Vector3 class is missing, use the following class in your project:

public class Vector3
{
    public float X { get; set; }
    public float Y { get; set; }
    public float Z { get; set; }

    public Vector3(float x, float y, float z)
    {
        X = x;
        Y = y;
        Z = z;
    }
    public static float Distance(Vector3 a, Vector3 b)
    {
        return (float)Math.Sqrt(Math.Pow(a.X - b.X, 2) + Math.Pow(a.Y - b.Y, 2) + Math.Pow(a.Z - b.Z, 2)); ;
    }
}

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