Hello ,..

I wrote a simple glut cube that can be moved and zoomed.

for some reason when the colors of the cube (rgb) are a bit dark .
how can i make them brighter .

Code:
#
# This example code will show how to draw a cube rotate and zoom it
# Was created by Jabka Atu and is released under GPL
#

#include <iostream>
#include <GL/glut.h>

using namespace std;

typedef unsigned char uchar;

static float fTranslatex = 0 ,fTranslatey = 0 ,fTranslatez = 0 ;
static float angle = 0;
static float fScale = 1;
static float rotqube ;

void disp();
void idle();
void drawexis();


void keyb(unsigned char key, int x, int y);
void skeyb(int key, int x, int y);
int drawcube();

int main(int argc,char **argv){

  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
  glutCreateWindow("Cube ... ");
  glClearColor(0.0,0.0,0.0,0.0);
  glutDisplayFunc(disp);
  glutIdleFunc(idle);
  glutKeyboardFunc(keyb);
  glutSpecialFunc(skeyb);
  glutMainLoop();
 return 0;
}



void disp()
{
 glClear(GL_COLOR_BUFFER_BIT);
 glLoadIdentity();
 
 glRotatef(angle,1.0,1.0,0.0);
 glTranslatef(fTranslatex, fTranslatey, fTranslatez); 
 glScalef(fScale, fScale, fScale);
 drawcube();
 glutSwapBuffers();

}

int drawcube()
{
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  glRotatef(rotqube,0.0f,1.0f,0.0f);	// Rotate The cube around the Y axis
  glRotatef(rotqube,1.0f,1.0f,1.0f);
  glEnable(GL_DEPTH_TEST); // Hide the bottom lines
  glBegin(GL_QUADS);		// Draw The Cube Using quads
    glColor3f(0.0f,0.3f,0.0f);	// Color Blue
    glVertex3f( 0.3f, 0.3f,-0.3f);	// Top Right Of The Quad (Top)
    glVertex3f(-0.3f, 0.3f,-0.3f);	// Top Left Of The Quad (Top)
    glVertex3f(-0.3f, 0.3f, 0.3f);	// Bottom Left Of The Quad (Top)
    glVertex3f( 0.3f, 0.3f, 0.3f);	// Bottom Right Of The Quad (Top)
    glColor3f(0.3f,0.5f,0.0f);	// Color Orange
    glVertex3f( 0.3f,-0.3f, 0.3f);	// Top Right Of The Quad (Bottom)
    glVertex3f(-0.3f,-0.3f, 0.3f);	// Top Left Of The Quad (Bottom)
    glVertex3f(-0.3f,-0.3f,-0.3f);	// Bottom Left Of The Quad (Bottom)
    glVertex3f( 0.3f,-0.3f,-0.3f);	// Bottom Right Of The Quad (Bottom)
    glColor3f(0.3f,0.0f,0.0f);	// Color Red	
    glVertex3f( 0.3f, 0.3f, 0.3f);	// Top Right Of The Quad (Front)
    glVertex3f(-0.3f, 0.3f, 0.3f);	// Top Left Of The Quad (Front)
    glVertex3f(-0.3f,-0.3f, 0.3f);	// Bottom Left Of The Quad (Front)
    glVertex3f( 0.3f,-0.3f, 0.3f);	// Bottom Right Of The Quad (Front)
    glColor3f(0.3f,0.3f,0.0f);	// Color Yellow
    glVertex3f( 0.3f,-0.3f,-0.3f);	// Top Right Of The Quad (Back)
    glVertex3f(-0.3f,-0.3f,-0.3f);	// Top Left Of The Quad (Back)
    glVertex3f(-0.3f, 0.3f,-0.3f);	// Bottom Left Of The Quad (Back)
    glVertex3f( 0.3f, 0.3f,-0.3f);	// Bottom Right Of The Quad (Back)
    glColor3f(0.0f,0.0f,0.3f);	// Color Blue
    glVertex3f(-0.3f, 0.3f, 0.3f);	// Top Right Of The Quad (Left)
    glVertex3f(-0.3f, 0.3f,-0.3f);	// Top Left Of The Quad (Left)
    glVertex3f(-0.3f,-0.3f,-0.3f);	// Bottom Left Of The Quad (Left)
    glVertex3f(-0.3f,-0.3f, 0.3f);	// Bottom Right Of The Quad (Left)
    glColor3f(0.3f,0.0f,0.3f);	// Color Violet
    glVertex3f( 0.3f, 0.3f,-0.3f);	// Top Right Of The Quad (Right)
    glVertex3f( 0.3f, 0.3f, 0.3f);	// Top Left Of The Quad (Right)
    glVertex3f( 0.3f,-0.3f, 0.3f);	// Bottom Left Of The Quad (Right)
    glVertex3f( 0.3f,-0.3f,-0.3f);	// Bottom Right Of The Quad (Right)
  glEnd();			// End Drawing The Cube
  



    return 1;		
}

void idle()
{
}

void skeyb(int key, int x, int y) {

	switch (key) 
        {
		case GLUT_KEY_LEFT :fTranslatex -= 0.1;glutPostRedisplay(); break;
		case GLUT_KEY_RIGHT :fTranslatex += 0.1;glutPostRedisplay(); break;
		case GLUT_KEY_UP :fTranslatey += 0.1;glutPostRedisplay(); break;
		case GLUT_KEY_DOWN :fTranslatey -= 0.1;glutPostRedisplay(); break;
	}
}

void keyb(unsigned char key, int x, int y)
{
   switch (key)
  {
    case 'a':angle+=1;glutPostRedisplay();break;
    case 's':angle-=1;glutPostRedisplay();break;
    case 'd':fScale*=1.1;glutPostRedisplay();break;
    case 'f':fScale*=0.9;glutPostRedisplay();break;
  
    case 'q':exit(0);break;
  }
}