RGB value convert to int value

Question

0.00/5 (No votes)

See more:

I want to write function to convert a RGB value to int value, but now i find sometimes the color display Red or Green directly not like #F2E906 so my funthion about dealing with the color value maybe has some issue,i need some help. I don't know red is same as #ff0000.becasue the function is deal with the value like #F2E906 if the red go to the function if we need to deal it with a special method?

Posted 7-Nov-13 21:27pm

wf0007

Updated 7-Nov-13 21:51pm

v2

Add a Solution

Comments

Xiao Ling 8-Nov-13 4:08am

How did you get the RGB value? Is it a String? Type in by user?

wf0007 8-Nov-13 4:23am

I use Canvas to make a color picker the use can get the color form it and set it to another place but now i can get the user selected color but it sometimes display red sometimes display #F2E906.
i get the value from web pages

Fredrik Bornander 8-Nov-13 5:06am

Is this on Android?

wf0007 13-Nov-13 20:32pm

No,It is a web application,sorry for reply it now.

Fredrik Bornander 14-Nov-13 2:55am

No worries. For a web application the solution I provided should work, I think I covered all of the html named colours in that list.

Glad I could help.

wf0007 14-Nov-13 8:12am

Thank you for your solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Fredrik Bornander · Accepted Answer · 2013-11-07T22:13:00

To parse a string like that into a colour you either need an existing library or hand roll your own conversions.

Something like this might do the trick for you;

Java

import java.io.*;
import java.util.*;



public class Program {


    private final Map<String, Integer> NAMED_COLORS = new HashMap<String, Integer>();

    public Program() {
        NAMED_COLORS.put("aliceblue",0xF0F8FF);
        NAMED_COLORS.put("antiquewhite",0xFAEBD7);
        NAMED_COLORS.put("aqua",0x00FFFF);
        NAMED_COLORS.put("aquamarine",0x7FFFD4);
        NAMED_COLORS.put("azure",0xF0FFFF);
        NAMED_COLORS.put("beige",0xF5F5DC);
        NAMED_COLORS.put("bisque",0xFFE4C4);
        NAMED_COLORS.put("black",0x000000);
        NAMED_COLORS.put("blanchedalmond",0xFFEBCD);
        NAMED_COLORS.put("blue",0x0000FF);
        NAMED_COLORS.put("blueviolet",0x8A2BE2);
        NAMED_COLORS.put("brown",0xA52A2A);
        NAMED_COLORS.put("burlywood",0xDEB887);
        NAMED_COLORS.put("cadetblue",0x5F9EA0);
        NAMED_COLORS.put("chartreuse",0x7FFF00);
        NAMED_COLORS.put("chocolate",0xD2691E);
        NAMED_COLORS.put("coral",0xFF7F50);
        NAMED_COLORS.put("cornflowerblue",0x6495ED);
        NAMED_COLORS.put("cornsilk",0xFFF8DC);
        NAMED_COLORS.put("crimson",0xDC143C);
        NAMED_COLORS.put("cyan",0x00FFFF);
        NAMED_COLORS.put("darkblue",0x00008B);
        NAMED_COLORS.put("darkcyan",0x008B8B);
        NAMED_COLORS.put("darkgoldenrod",0xB8860B);
        NAMED_COLORS.put("darkgray",0xA9A9A9);
        NAMED_COLORS.put("darkgreen",0x006400);
        NAMED_COLORS.put("darkkhaki",0xBDB76B);
        NAMED_COLORS.put("darkmagenta",0x8B008B);
        NAMED_COLORS.put("darkolivegreen",0x556B2F);
        NAMED_COLORS.put("darkorange",0xFF8C00);
        NAMED_COLORS.put("darkorchid",0x9932CC);
        NAMED_COLORS.put("darkred",0x8B0000);
        NAMED_COLORS.put("darksalmon",0xE9967A);
        NAMED_COLORS.put("darkseagreen",0x8FBC8F);
        NAMED_COLORS.put("darkslateblue",0x483D8B);
        NAMED_COLORS.put("darkslategray",0x2F4F4F);
        NAMED_COLORS.put("darkturquoise",0x00CED1);
        NAMED_COLORS.put("darkviolet",0x9400D3);
        NAMED_COLORS.put("deeppink",0xFF1493);
        NAMED_COLORS.put("deepskyblue",0x00BFFF);
        NAMED_COLORS.put("dimgray",0x696969);
        NAMED_COLORS.put("dodgerblue",0x1E90FF);
        NAMED_COLORS.put("firebrick",0xB22222);
        NAMED_COLORS.put("floralwhite",0xFFFAF0);
        NAMED_COLORS.put("forestgreen",0x228B22);
        NAMED_COLORS.put("fuchsia",0xFF00FF);
        NAMED_COLORS.put("gainsboro",0xDCDCDC);
        NAMED_COLORS.put("ghostwhite",0xF8F8FF);
        NAMED_COLORS.put("gold",0xFFD700);
        NAMED_COLORS.put("goldenrod",0xDAA520);
        NAMED_COLORS.put("gray",0x808080);
        NAMED_COLORS.put("green",0x008000);
        NAMED_COLORS.put("greenyellow",0xADFF2F);
        NAMED_COLORS.put("honeydew",0xF0FFF0);
        NAMED_COLORS.put("hotpink",0xFF69B4);
        NAMED_COLORS.put("indianred ",0xCD5C5C);
        NAMED_COLORS.put("indigo ",0x4B0082);
        NAMED_COLORS.put("ivory",0xFFFFF0);
        NAMED_COLORS.put("khaki",0xF0E68C);
        NAMED_COLORS.put("lavender",0xE6E6FA);
        NAMED_COLORS.put("lavenderblush",0xFFF0F5);
        NAMED_COLORS.put("lawngreen",0x7CFC00);
        NAMED_COLORS.put("lemonchiffon",0xFFFACD);
        NAMED_COLORS.put("lightblue",0xADD8E6);
        NAMED_COLORS.put("lightcoral",0xF08080);
        NAMED_COLORS.put("lightcyan",0xE0FFFF);
        NAMED_COLORS.put("lightgoldenrodyellow",0xFAFAD2);
        NAMED_COLORS.put("lightgray",0xD3D3D3);
        NAMED_COLORS.put("lightgreen",0x90EE90);
        NAMED_COLORS.put("lightpink",0xFFB6C1);
        NAMED_COLORS.put("lightsalmon",0xFFA07A);
        NAMED_COLORS.put("lightseagreen",0x20B2AA);
        NAMED_COLORS.put("lightskyblue",0x87CEFA);
        NAMED_COLORS.put("lightslategray",0x778899);
        NAMED_COLORS.put("lightsteelblue",0xB0C4DE);
        NAMED_COLORS.put("lightyellow",0xFFFFE0);
        NAMED_COLORS.put("lime",0x00FF00);
        NAMED_COLORS.put("limegreen",0x32CD32);
        NAMED_COLORS.put("linen",0xFAF0E6);
        NAMED_COLORS.put("magenta",0xFF00FF);
        NAMED_COLORS.put("maroon",0x800000);
        NAMED_COLORS.put("mediumaquamarine",0x66CDAA);
        NAMED_COLORS.put("mediumblue",0x0000CD);
        NAMED_COLORS.put("mediumorchid",0xBA55D3);
        NAMED_COLORS.put("mediumpurple",0x9370DB);
        NAMED_COLORS.put("mediumseagreen",0x3CB371);
        NAMED_COLORS.put("mediumslateblue",0x7B68EE);
        NAMED_COLORS.put("mediumspringgreen",0x00FA9A);
        NAMED_COLORS.put("mediumturquoise",0x48D1CC);
        NAMED_COLORS.put("mediumvioletred",0xC71585);
        NAMED_COLORS.put("midnightblue",0x191970);
        NAMED_COLORS.put("mintcream",0xF5FFFA);
        NAMED_COLORS.put("mistyrose",0xFFE4E1);
        NAMED_COLORS.put("moccasin",0xFFE4B5);
        NAMED_COLORS.put("navajowhite",0xFFDEAD);
        NAMED_COLORS.put("navy",0x000080);
        NAMED_COLORS.put("oldlace",0xFDF5E6);
        NAMED_COLORS.put("olive",0x808000);
        NAMED_COLORS.put("olivedrab",0x6B8E23);
        NAMED_COLORS.put("orange",0xFFA500);
        NAMED_COLORS.put("orangered",0xFF4500);
        NAMED_COLORS.put("orchid",0xDA70D6);
        NAMED_COLORS.put("palegoldenrod",0xEEE8AA);
        NAMED_COLORS.put("palegreen",0x98FB98);
        NAMED_COLORS.put("paleturquoise",0xAFEEEE);
        NAMED_COLORS.put("palevioletred",0xDB7093);
        NAMED_COLORS.put("papayawhip",0xFFEFD5);
        NAMED_COLORS.put("peachpuff",0xFFDAB9);
        NAMED_COLORS.put("peru",0xCD853F);
        NAMED_COLORS.put("pink",0xFFC0CB);
        NAMED_COLORS.put("plum",0xDDA0DD);
        NAMED_COLORS.put("powderblue",0xB0E0E6);
        NAMED_COLORS.put("purple",0x800080);
        NAMED_COLORS.put("red",0xFF0000);
        NAMED_COLORS.put("rosybrown",0xBC8F8F);
        NAMED_COLORS.put("royalblue",0x4169E1);
        NAMED_COLORS.put("saddlebrown",0x8B4513);
        NAMED_COLORS.put("salmon",0xFA8072);
        NAMED_COLORS.put("sandybrown",0xF4A460);
        NAMED_COLORS.put("seagreen",0x2E8B57);
        NAMED_COLORS.put("seashell",0xFFF5EE);
        NAMED_COLORS.put("sienna",0xA0522D);
        NAMED_COLORS.put("silver",0xC0C0C0);
        NAMED_COLORS.put("skyblue",0x87CEEB);
        NAMED_COLORS.put("slateblue",0x6A5ACD);
        NAMED_COLORS.put("slategray",0x708090);
        NAMED_COLORS.put("snow",0xFFFAFA);
        NAMED_COLORS.put("springgreen",0x00FF7F);
        NAMED_COLORS.put("steelblue",0x4682B4);
        NAMED_COLORS.put("tan",0xD2B48C);
        NAMED_COLORS.put("teal",0x008080);
        NAMED_COLORS.put("thistle",0xD8BFD8);
        NAMED_COLORS.put("tomato",0xFF6347);
        NAMED_COLORS.put("turquoise",0x40E0D0);
        NAMED_COLORS.put("violet",0xEE82EE);
        NAMED_COLORS.put("wheat",0xF5DEB3);
        NAMED_COLORS.put("white",0xFFFFFF);
        NAMED_COLORS.put("whitesmoke",0xF5F5F5);
        NAMED_COLORS.put("yellow",0xFFFF00);
        NAMED_COLORS.put("yellowgreen",0x9ACD32);
    }

    public int convert(final String color) {
        if (NAMED_COLORS.containsKey(color.toLowerCase()))
            return NAMED_COLORS.get(color.toLowerCase());

        if (color.startsWith("#")) {
            return Integer.parseInt(color.substring(1), 16);
        }

        throw new IllegalArgumentException();
    }

    public static void main(String[] args)
    {
        Program p = new Program();
        System.out.println("AliceBlue: " + p.convert("#A"));
    }
}

Hope this helps,
Fredrik