Converti valori RGB in nome colore

Question

Come posso convertire un colore in formato RGB in un nome di colore?

Esempi:

• (0, 0, 255) -> "blue"
• (255, 0, 0) -> "red"
• (128, 128, 128) - > "grigio"

Answer 1

1. Compilare un elenco di colori "noti".

2. Per ogni calcolo colore nota:

   rgbDistance = Math.abs(myColor.getRed() - colorI.getRed() + 
          Math.abs(myColor.getGreen() - colorI.getGreen()) + 
          Math.abs(myColor.getBlue() - colorI.getBlue()) 
   

3. ritorno il nome di colorI per il quale rgbDistance era più piccolo.

Answer 2

Non tutti i valori RGB hanno alias. Potrebbe essere necessario creare un array contenente matrici di valori di rosso, verde, blu e alias. Quindi eseguiresti l'iterazione su quell'array confrontando i valori RGB.

http://en.wikipedia.org/wiki/List_of_colors

Edit:

Esempio:

//array of known aliases and rgb values 
ArrayList colorList = new ArrayList(); 
colorList.add(new String[] {"255", "0", "0", "Red"}); 
//etc... 

Color c = new Color(255, 0, 0); //test color 
String name = "Unknown"; 
for (String[] color : colorList) 
{ 
    int r = Integer.parseInt(color[0]) //red value 
    int g = Integer.parseInt(color[1]) //green value 
    int b = Integer.parseInt(color[2]) //blue value 
    String alias = color[3]; 

    if ((c.getRed() == r) && (c.getGreen() == g) && (c.getBlue() == b)) 
    { 
     name = alias; //found it 
     break; 
    } 
} 

Answer 3

Si potrebbe semplicemente creare una tabella di ricerca, ad esempio, utilizzando le costanti dalla classe Color stessa:

Map<Integer, String> map = new HashMap<Integer, String>(); 
for (Field f : Color.class.getFields()) { 
    if (f.getType() == Color.class) { 
    Color c = (Color) f.get(null); 
    map.put(c.getRGB(), f.getName()); 
    } 
} 

Se si desidera che tutti i colori HTML o tutti coloro forma Wikipedia legato da @evan, avete ancora un po 'di compiti da fare però.

EDIT mappa risultante:

0xff00ffff: CYAN 
0xff0000ff: BLUE 
0xffc0c0c0: LIGHT_GRAY 
0xff808080: GRAY 
0xffffff00: YELLOW 
0xffff0000: RED 
0xffffafaf: PINK 
0xff000000: BLACK 
0xff00ff00: GREEN 
0xffffc800: ORANGE 
0xff404040: DARK_GRAY 
0xffff00ff: MAGENTA 
0xffffffff: WHITE 

Answer 4

Hmm, che è un tipo di problema divertimento. Mi vengono in mente un paio di soluzioni:

1. si potrebbe fare un po 'di congetture a seconda delle relazioni tra i valori RGB (ad esempio, se un colore è molto dominante a indovinare che uno, ma se c'è un po' di altri colori è sempre più probabile che indovini la combinazione di questi due colori emessi, se tutti e tre sono vicini a uguali, allora indovina il bianco, il grigio o il nero a seconda di quanto è alta la media dei tre valori, se due sono alti e l'altro è basso, supponiamo che la combinazione dei due ecc. ecc.)

2. Si potrebbe optare per un approccio di apprendimento in cui si impostano alcune ipotesi iniziali (come sopra) e quindi si migliorano quelle basate sul feedback da parte nostra ERS.

Purtroppo questo problema è relativamente soggettivo (anche se la questione non è!) Come percezione del colore della gente varia ampiamente tra cultura e anche di genere (vedi Randall Munroe's "study" on it).

Se si desidera un sottoinsieme specifico di valori RGB (come quelli a cui sono state fornite costanti in Java o C#, è possibile scorrere tutti e confrontare, restituendo infine un valore predefinito se non è uguale a nessuno di essi).

[EDIT]

Ahh! Utenti Colorblind eh? Hai pensato di creare un'impostazione che permetta all'utente di specificare quali colori hanno difficoltà a differenziare? Se lo facessi potresti fargli sapere che qualcosa è "20% più rosso del verde" (se, ad esempio, avessero il daltonismo rosso-verde, che è più comune). Sarebbe piuttosto semplice.Scelgono un pixel, e si segue questo pseudocodice:

if(userColorTrouble == RedGreen) 
{ 
    int redVal = colorInQuestion.GetRed(); 
    int greenVal = colorInQuestion.GetGreen(); 
    if(redVal > greenVal) 
    { 
     return "The color is " + (double)redVal/(redVal + greenVal) - .5d + "% redder than green"; 
    } 
    else 
    { 
     return "The color is " + (double)greenVal/(redVal + greenVal) - .5d + "% greener than red"; 
    } 
} 

che potrebbe essere una soluzione più semplice e più utile.

Answer 5

Frist di tutti i pixel di conversione da RGB a HSV. È molto più facile definire gli intervalli di colori in HSV che in RGB.

/** 
* 
*@author Tomasz Drobiszewski 
*/ 
public class Color { 
    /** 
    * Human color table. 
    */ 
    public static final int [] [] colors = { 
      {-1,-10,-360,-0,-100,-10,-80}, 
      {1,0,360,0,100,0,50}, 
      {2,0,360,0,15,50,130}, 
      {3,0,360,0,15,130,210}, 
      {4,-15,15,15,100,50,255}, 
      {5,15,45,15,100,50,255}, 
      {6,45,75,15,100,50,255}, 
      {7,75,105,15,100,50,255}, 
      {8,105,135,15,100,50,255}, 
      {9,135,165,15,100,50,255}, 
      {10,165,195,15,100,50,255}, 
      {11,195,225,15,100,50,255}, 
      {12,225,255,15,100,50,255}, 
      {13,255,285,15,100,50,255}, 
      {14,285,315,15,100,50,255}, 
      {15,315,345,15,100,50,255}, 
      {16,345,375,15,100,50,255}, 
      {17,0,360,0,15,210,255} 
    }; 

    /** 
    * Color names. 
    */ 
    public static final String [] humanColors = { 
      "unrecognized", 
      "black", //black colors[1] 
      "grey", 
      "light_grey", 
      "red", 
      "orange", 
      "yellow", 
      "jasny_zielony", 
      "zielony", 
      "zielony", 
      "turkusowy", 
      "jasny_niebieski", 
      "niebieski", 
      "fioletowy", 
      "fioletowy", 
      "rozowy", 
      "czerwony", 
      "bialy", 
     }; 

    /** 
    * Convert from RGB do HSV 
    * 
    * @param r 
    * @param g 
    * @param b 
    * @param hsv 
    */ 
    public static void rgb2hsv(int r, int g, int b, int hsv[]) { 

     int min; // Min. value of RGB 
     int max; // Max. value of RGB 
     int delMax; // Delta RGB value 

     if (r > g) { 
      min = g; 
      max = r; 
     } else { 
      min = r; 
      max = g; 
     } 
     if (b > max) 
      max = b; 
     if (b < min) 
      min = b; 

     delMax = max - min; 

     float H = 0, S; 
     float V = max; 

     if (delMax == 0) { 
      H = 0; 
      S = 0; 

     } else { 
      S = delMax/(float) max; 
      if (r == max) 
       H = ((g - b)/(float) delMax) * 60; 
      else if (g == max) 
       H = (2 + (b - r)/(float) delMax) * 60; 
      else if (b == max) 
       H = (4 + (r - g)/(float) delMax) * 60; 

     } 

     hsv[0] = (int) (H); 
     hsv[1] = (int) (S * 100); 
     hsv[2] = (int) V; 
    } 

    /** 
    * Return human color index {@link Color#colors} 
    * 
    * @param r 
    * @param g 
    * @param b 
    * @return 
    */ 
    public static int [] getHumanColor(int r, int g, int b) { 
     int [] res = {0, 0, 0, 0}; 
     int[] hsv = new int[3]; 
     rgb2hsv(r, g, b, hsv); 
     for (int i = 1; i < colors.length; i++) { 
      if (hsv[0] <= colors[i][2] && hsv[0] >= colors[i][1] 
        && hsv[1] <= colors[i][4] && hsv[1] >= colors[i][3] 
        && hsv[2] <= colors[i][6] && hsv[2] >= colors[i][5]) { 
       res[3] = i; 
       res[0] = hsv[0]; 
       res[1] = hsv[1]; 
       res[2] = hsv[2]; 
       return res; 
      } 

     } 
     return res; 
    } 

} 

Answer 6

Qui è a working sample code che lo fa. Converte un valore rgb/hex valore/awt nel nome del colore più vicino.

import java.awt.Color; 
import java.util.ArrayList; 

/** 
* Java Code to get a color name from rgb/hex value/awt color 
* 
* The part of looking up a color name from the rgb values is edited from 
* https://gist.github.com/nightlark/6482130#file-gistfile1-java (that has some errors) by Ryan Mast (nightlark) 
* 
* @author Xiaoxiao Li 
* 
*/ 
public class ColorUtils { 

    /** 
    * Initialize the color list that we have. 
    */ 
    private ArrayList<ColorName> initColorList() { 
     ArrayList<ColorName> colorList = new ArrayList<ColorName>(); 
     colorList.add(new ColorName("AliceBlue", 0xF0, 0xF8, 0xFF)); 
     colorList.add(new ColorName("AntiqueWhite", 0xFA, 0xEB, 0xD7)); 
     colorList.add(new ColorName("Aqua", 0x00, 0xFF, 0xFF)); 
     colorList.add(new ColorName("Aquamarine", 0x7F, 0xFF, 0xD4)); 
     colorList.add(new ColorName("Azure", 0xF0, 0xFF, 0xFF)); 
     colorList.add(new ColorName("Beige", 0xF5, 0xF5, 0xDC)); 
     colorList.add(new ColorName("Bisque", 0xFF, 0xE4, 0xC4)); 
     colorList.add(new ColorName("Black", 0x00, 0x00, 0x00)); 
     colorList.add(new ColorName("BlanchedAlmond", 0xFF, 0xEB, 0xCD)); 
     colorList.add(new ColorName("Blue", 0x00, 0x00, 0xFF)); 
     colorList.add(new ColorName("BlueViolet", 0x8A, 0x2B, 0xE2)); 
     colorList.add(new ColorName("Brown", 0xA5, 0x2A, 0x2A)); 
     colorList.add(new ColorName("BurlyWood", 0xDE, 0xB8, 0x87)); 
     colorList.add(new ColorName("CadetBlue", 0x5F, 0x9E, 0xA0)); 
     colorList.add(new ColorName("Chartreuse", 0x7F, 0xFF, 0x00)); 
     colorList.add(new ColorName("Chocolate", 0xD2, 0x69, 0x1E)); 
     colorList.add(new ColorName("Coral", 0xFF, 0x7F, 0x50)); 
     colorList.add(new ColorName("CornflowerBlue", 0x64, 0x95, 0xED)); 
     colorList.add(new ColorName("Cornsilk", 0xFF, 0xF8, 0xDC)); 
     colorList.add(new ColorName("Crimson", 0xDC, 0x14, 0x3C)); 
     colorList.add(new ColorName("Cyan", 0x00, 0xFF, 0xFF)); 
     colorList.add(new ColorName("DarkBlue", 0x00, 0x00, 0x8B)); 
     colorList.add(new ColorName("DarkCyan", 0x00, 0x8B, 0x8B)); 
     colorList.add(new ColorName("DarkGoldenRod", 0xB8, 0x86, 0x0B)); 
     colorList.add(new ColorName("DarkGray", 0xA9, 0xA9, 0xA9)); 
     colorList.add(new ColorName("DarkGreen", 0x00, 0x64, 0x00)); 
     colorList.add(new ColorName("DarkKhaki", 0xBD, 0xB7, 0x6B)); 
     colorList.add(new ColorName("DarkMagenta", 0x8B, 0x00, 0x8B)); 
     colorList.add(new ColorName("DarkOliveGreen", 0x55, 0x6B, 0x2F)); 
     colorList.add(new ColorName("DarkOrange", 0xFF, 0x8C, 0x00)); 
     colorList.add(new ColorName("DarkOrchid", 0x99, 0x32, 0xCC)); 
     colorList.add(new ColorName("DarkRed", 0x8B, 0x00, 0x00)); 
     colorList.add(new ColorName("DarkSalmon", 0xE9, 0x96, 0x7A)); 
     colorList.add(new ColorName("DarkSeaGreen", 0x8F, 0xBC, 0x8F)); 
     colorList.add(new ColorName("DarkSlateBlue", 0x48, 0x3D, 0x8B)); 
     colorList.add(new ColorName("DarkSlateGray", 0x2F, 0x4F, 0x4F)); 
     colorList.add(new ColorName("DarkTurquoise", 0x00, 0xCE, 0xD1)); 
     colorList.add(new ColorName("DarkViolet", 0x94, 0x00, 0xD3)); 
     colorList.add(new ColorName("DeepPink", 0xFF, 0x14, 0x93)); 
     colorList.add(new ColorName("DeepSkyBlue", 0x00, 0xBF, 0xFF)); 
     colorList.add(new ColorName("DimGray", 0x69, 0x69, 0x69)); 
     colorList.add(new ColorName("DodgerBlue", 0x1E, 0x90, 0xFF)); 
     colorList.add(new ColorName("FireBrick", 0xB2, 0x22, 0x22)); 
     colorList.add(new ColorName("FloralWhite", 0xFF, 0xFA, 0xF0)); 
     colorList.add(new ColorName("ForestGreen", 0x22, 0x8B, 0x22)); 
     colorList.add(new ColorName("Fuchsia", 0xFF, 0x00, 0xFF)); 
     colorList.add(new ColorName("Gainsboro", 0xDC, 0xDC, 0xDC)); 
     colorList.add(new ColorName("GhostWhite", 0xF8, 0xF8, 0xFF)); 
     colorList.add(new ColorName("Gold", 0xFF, 0xD7, 0x00)); 
     colorList.add(new ColorName("GoldenRod", 0xDA, 0xA5, 0x20)); 
     colorList.add(new ColorName("Gray", 0x80, 0x80, 0x80)); 
     colorList.add(new ColorName("Green", 0x00, 0x80, 0x00)); 
     colorList.add(new ColorName("GreenYellow", 0xAD, 0xFF, 0x2F)); 
     colorList.add(new ColorName("HoneyDew", 0xF0, 0xFF, 0xF0)); 
     colorList.add(new ColorName("HotPink", 0xFF, 0x69, 0xB4)); 
     colorList.add(new ColorName("IndianRed", 0xCD, 0x5C, 0x5C)); 
     colorList.add(new ColorName("Indigo", 0x4B, 0x00, 0x82)); 
     colorList.add(new ColorName("Ivory", 0xFF, 0xFF, 0xF0)); 
     colorList.add(new ColorName("Khaki", 0xF0, 0xE6, 0x8C)); 
     colorList.add(new ColorName("Lavender", 0xE6, 0xE6, 0xFA)); 
     colorList.add(new ColorName("LavenderBlush", 0xFF, 0xF0, 0xF5)); 
     colorList.add(new ColorName("LawnGreen", 0x7C, 0xFC, 0x00)); 
     colorList.add(new ColorName("LemonChiffon", 0xFF, 0xFA, 0xCD)); 
     colorList.add(new ColorName("LightBlue", 0xAD, 0xD8, 0xE6)); 
     colorList.add(new ColorName("LightCoral", 0xF0, 0x80, 0x80)); 
     colorList.add(new ColorName("LightCyan", 0xE0, 0xFF, 0xFF)); 
     colorList.add(new ColorName("LightGoldenRodYellow", 0xFA, 0xFA, 0xD2)); 
     colorList.add(new ColorName("LightGray", 0xD3, 0xD3, 0xD3)); 
     colorList.add(new ColorName("LightGreen", 0x90, 0xEE, 0x90)); 
     colorList.add(new ColorName("LightPink", 0xFF, 0xB6, 0xC1)); 
     colorList.add(new ColorName("LightSalmon", 0xFF, 0xA0, 0x7A)); 
     colorList.add(new ColorName("LightSeaGreen", 0x20, 0xB2, 0xAA)); 
     colorList.add(new ColorName("LightSkyBlue", 0x87, 0xCE, 0xFA)); 
     colorList.add(new ColorName("LightSlateGray", 0x77, 0x88, 0x99)); 
     colorList.add(new ColorName("LightSteelBlue", 0xB0, 0xC4, 0xDE)); 
     colorList.add(new ColorName("LightYellow", 0xFF, 0xFF, 0xE0)); 
     colorList.add(new ColorName("Lime", 0x00, 0xFF, 0x00)); 
     colorList.add(new ColorName("LimeGreen", 0x32, 0xCD, 0x32)); 
     colorList.add(new ColorName("Linen", 0xFA, 0xF0, 0xE6)); 
     colorList.add(new ColorName("Magenta", 0xFF, 0x00, 0xFF)); 
     colorList.add(new ColorName("Maroon", 0x80, 0x00, 0x00)); 
     colorList.add(new ColorName("MediumAquaMarine", 0x66, 0xCD, 0xAA)); 
     colorList.add(new ColorName("MediumBlue", 0x00, 0x00, 0xCD)); 
     colorList.add(new ColorName("MediumOrchid", 0xBA, 0x55, 0xD3)); 
     colorList.add(new ColorName("MediumPurple", 0x93, 0x70, 0xDB)); 
     colorList.add(new ColorName("MediumSeaGreen", 0x3C, 0xB3, 0x71)); 
     colorList.add(new ColorName("MediumSlateBlue", 0x7B, 0x68, 0xEE)); 
     colorList.add(new ColorName("MediumSpringGreen", 0x00, 0xFA, 0x9A)); 
     colorList.add(new ColorName("MediumTurquoise", 0x48, 0xD1, 0xCC)); 
     colorList.add(new ColorName("MediumVioletRed", 0xC7, 0x15, 0x85)); 
     colorList.add(new ColorName("MidnightBlue", 0x19, 0x19, 0x70)); 
     colorList.add(new ColorName("MintCream", 0xF5, 0xFF, 0xFA)); 
     colorList.add(new ColorName("MistyRose", 0xFF, 0xE4, 0xE1)); 
     colorList.add(new ColorName("Moccasin", 0xFF, 0xE4, 0xB5)); 
     colorList.add(new ColorName("NavajoWhite", 0xFF, 0xDE, 0xAD)); 
     colorList.add(new ColorName("Navy", 0x00, 0x00, 0x80)); 
     colorList.add(new ColorName("OldLace", 0xFD, 0xF5, 0xE6)); 
     colorList.add(new ColorName("Olive", 0x80, 0x80, 0x00)); 
     colorList.add(new ColorName("OliveDrab", 0x6B, 0x8E, 0x23)); 
     colorList.add(new ColorName("Orange", 0xFF, 0xA5, 0x00)); 
     colorList.add(new ColorName("OrangeRed", 0xFF, 0x45, 0x00)); 
     colorList.add(new ColorName("Orchid", 0xDA, 0x70, 0xD6)); 
     colorList.add(new ColorName("PaleGoldenRod", 0xEE, 0xE8, 0xAA)); 
     colorList.add(new ColorName("PaleGreen", 0x98, 0xFB, 0x98)); 
     colorList.add(new ColorName("PaleTurquoise", 0xAF, 0xEE, 0xEE)); 
     colorList.add(new ColorName("PaleVioletRed", 0xDB, 0x70, 0x93)); 
     colorList.add(new ColorName("PapayaWhip", 0xFF, 0xEF, 0xD5)); 
     colorList.add(new ColorName("PeachPuff", 0xFF, 0xDA, 0xB9)); 
     colorList.add(new ColorName("Peru", 0xCD, 0x85, 0x3F)); 
     colorList.add(new ColorName("Pink", 0xFF, 0xC0, 0xCB)); 
     colorList.add(new ColorName("Plum", 0xDD, 0xA0, 0xDD)); 
     colorList.add(new ColorName("PowderBlue", 0xB0, 0xE0, 0xE6)); 
     colorList.add(new ColorName("Purple", 0x80, 0x00, 0x80)); 
     colorList.add(new ColorName("Red", 0xFF, 0x00, 0x00)); 
     colorList.add(new ColorName("RosyBrown", 0xBC, 0x8F, 0x8F)); 
     colorList.add(new ColorName("RoyalBlue", 0x41, 0x69, 0xE1)); 
     colorList.add(new ColorName("SaddleBrown", 0x8B, 0x45, 0x13)); 
     colorList.add(new ColorName("Salmon", 0xFA, 0x80, 0x72)); 
     colorList.add(new ColorName("SandyBrown", 0xF4, 0xA4, 0x60)); 
     colorList.add(new ColorName("SeaGreen", 0x2E, 0x8B, 0x57)); 
     colorList.add(new ColorName("SeaShell", 0xFF, 0xF5, 0xEE)); 
     colorList.add(new ColorName("Sienna", 0xA0, 0x52, 0x2D)); 
     colorList.add(new ColorName("Silver", 0xC0, 0xC0, 0xC0)); 
     colorList.add(new ColorName("SkyBlue", 0x87, 0xCE, 0xEB)); 
     colorList.add(new ColorName("SlateBlue", 0x6A, 0x5A, 0xCD)); 
     colorList.add(new ColorName("SlateGray", 0x70, 0x80, 0x90)); 
     colorList.add(new ColorName("Snow", 0xFF, 0xFA, 0xFA)); 
     colorList.add(new ColorName("SpringGreen", 0x00, 0xFF, 0x7F)); 
     colorList.add(new ColorName("SteelBlue", 0x46, 0x82, 0xB4)); 
     colorList.add(new ColorName("Tan", 0xD2, 0xB4, 0x8C)); 
     colorList.add(new ColorName("Teal", 0x00, 0x80, 0x80)); 
     colorList.add(new ColorName("Thistle", 0xD8, 0xBF, 0xD8)); 
     colorList.add(new ColorName("Tomato", 0xFF, 0x63, 0x47)); 
     colorList.add(new ColorName("Turquoise", 0x40, 0xE0, 0xD0)); 
     colorList.add(new ColorName("Violet", 0xEE, 0x82, 0xEE)); 
     colorList.add(new ColorName("Wheat", 0xF5, 0xDE, 0xB3)); 
     colorList.add(new ColorName("White", 0xFF, 0xFF, 0xFF)); 
     colorList.add(new ColorName("WhiteSmoke", 0xF5, 0xF5, 0xF5)); 
     colorList.add(new ColorName("Yellow", 0xFF, 0xFF, 0x00)); 
     colorList.add(new ColorName("YellowGreen", 0x9A, 0xCD, 0x32)); 
     return colorList; 
    } 

    /** 
    * Get the closest color name from our list 
    * 
    * @param r 
    * @param g 
    * @param b 
    * @return 
    */ 
    public String getColorNameFromRgb(int r, int g, int b) { 
     ArrayList<ColorName> colorList = initColorList(); 
     ColorName closestMatch = null; 
     int minMSE = Integer.MAX_VALUE; 
     int mse; 
     for (ColorName c : colorList) { 
      mse = c.computeMSE(r, g, b); 
      if (mse < minMSE) { 
       minMSE = mse; 
       closestMatch = c; 
      } 
     } 

     if (closestMatch != null) { 
      return closestMatch.getName(); 
     } else { 
      return "No matched color name."; 
     } 
    } 

    /** 
    * Convert hexColor to rgb, then call getColorNameFromRgb(r, g, b) 
    * 
    * @param hexColor 
    * @return 
    */ 
    public String getColorNameFromHex(int hexColor) { 
     int r = (hexColor & 0xFF0000) >> 16; 
     int g = (hexColor & 0xFF00) >> 8; 
     int b = (hexColor & 0xFF); 
     return getColorNameFromRgb(r, g, b); 
    } 

    public int colorToHex(Color c) { 
     return Integer.decode("0x" 
       + Integer.toHexString(c.getRGB()).substring(2)); 
    } 

    public String getColorNameFromColor(Color color) { 
     return getColorNameFromRgb(color.getRed(), color.getGreen(), 
       color.getBlue()); 
    } 

    /** 
    * SubClass of ColorUtils. In order to lookup color name 
    * 
    * @author Xiaoxiao Li 
    * 
    */ 
    public class ColorName { 
     public int r, g, b; 
     public String name; 

     public ColorName(String name, int r, int g, int b) { 
      this.r = r; 
      this.g = g; 
      this.b = b; 
      this.name = name; 
     } 

     public int computeMSE(int pixR, int pixG, int pixB) { 
      return (int) (((pixR - r) * (pixR - r) + (pixG - g) * (pixG - g) + (pixB - b) 
        * (pixB - b))/3); 
     } 

     public int getR() { 
      return r; 
     } 

     public int getG() { 
      return g; 
     } 

     public int getB() { 
      return b; 
     } 

     public String getName() { 
      return name; 
     } 
    } 
} 

Answer 7

Nel mio caso ero alla ricerca di un modo rapido per ottenere il nome di colori primari visualizzabile su tutti o tutti fuori i LED in modo che la seguente funzione funziona per me. Spero sia utile a qualcuno.

public static String getColourName(int c) { 
    String name = "UNKNOWN"; 
    int colour = Color.BLACK; 

    if(Color.red(c) > 127) { colour |= Color.RED; } 
    if(Color.green(c) > 127) { colour |= Color.GREEN; } 
    if(Color.blue(c) > 127) { colour |= Color.BLUE; } 

    switch (colour) { 
     case Color.BLACK: 
      name = "BLACK"; 
      break; 
     case Color.BLUE: 
      name = "BLUE"; 
      break; 
     case Color.GREEN: 
      name = "GREEN"; 
      break; 
     case Color.CYAN: 
      name = "CYAN"; 
      break; 
     case Color.RED: 
      name = "RED"; 
      break; 
     case Color.MAGENTA: 
      name = "MAGENTA"; 
      break; 
     case Color.YELLOW: 
      name = "YELLOW"; 
      break; 
     case Color.WHITE: 
      name = "WHITE"; 
      break; 
    } 
    return name; 
}