How to get Color from RGB value in JAVA

  • Java
  • Thread starter yooyo
  • Start date
  • #1
7
0

Main Question or Discussion Point

Is there any way to get color from RGB value?

for example

If I give some random RGB value like r=221 g=255 b=123 then how do I get the color associated this RGB value?



Thanks in advance.
 

Answers and Replies

  • #2
sas3
Gold Member
209
9
  • #3
mjsd
Homework Helper
726
3
if you just wanna check what's the color looks like given a set of rgb in decimal, you can quickly check it using simple program like MS Paint.
Go to custom color and input the rgb values into the appropriate box, and you will see what that color looks like. It is quick too!

If they are in Hex, convert them into decimal first. most calculators can do that for you.
 
  • #4
Hurkyl
Staff Emeritus
Science Advisor
Gold Member
14,916
18
Did you check the constructors for the Color class?
 
  • #5
ChrisLeslie
This will let you see what various RGB's look like:

import java.awt.*;
import javax.swing.*;

public class RGB
{
public static void main(String[] args)
{
JFrame frame = new JFrame("RGB");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
RGBpanel panel = new RGBpanel();
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
}

class RGBpanel extends JPanel
{
public RGBpanel()
{
setPreferredSize(new Dimension(300,300));
int red = Integer.parseInt(JOptionPane.showInputDialog("Enter red value"));
int green = Integer.parseInt(JOptionPane.showInputDialog("Enter green value"));
int blue = Integer.parseInt(JOptionPane.showInputDialog("Enter blue value"));
Color colr = new Color(red,green,blue);
setBackground(colr);
}
}
 
  • #6
7
0
oh right.. I was looking for the method,
the Color has a constructor which is
Color(int r, int g, int b)
Creates an opaque sRGB color with the specified red, green, and blue values in the range (0 - 255).

another question is how do I control the image transparency?
 
  • #7
644
1
Color Class in Java
-------------------------------------------------------------------------
Color

public Color(float r,
float g,
float b,
float a)

Creates an sRGB color with the specified red, green, blue, and alpha values in the range (0.0 - 1.0). The actual color used in rendering depends on finding the best match given the color space available for a particular output device.

Parameters:
r - the red component
g - the green component
b - the blue component
a - the alpha component
-------------------------------------------------------------------------
Alpha controls image transparency

-- AI
 
  • #8
1
0
hello,
i want to learn from the basics of java script language
thank you very much if you help me out
Hira_rose
 

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