c++ - Converting gray scale BMP to full color -

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i'm learning basic image processing , using gray scale bmp file work algorithms i'd convert code put out color bmp files instead of gray scale. i'm using easybmp library , have following read in , write bmp file:

bool image::readfrombmpfile(const std::string & inputfilename){     bool success = true;     // use bmp object read image     bmp inputimage;      success = inputimage.readfromfile(inputfilename.c_str() );     if( success ){         // allocate memory image (deleting old, if exists)         m_numrows = inputimage.tellheight();         m_numcols = inputimage.tellwidth();         if( m_pixels != null ){             // deallocate old memory             delete [] m_pixels;         }         m_pixels = new double[m_numrows * m_numcols];         // copy pixels         for( int r = 0; r < m_numrows; ++r ){             for( int c = 0; c < m_numcols; ++c ){                 rgbapixel pixelval = inputimage.getpixel(c, r);                 double val = (double) pixelval.blue + (double) pixelval.green + (double) pixelval.red;                 val = (val / 3.0 + 0.5);                 m_pixels[r * m_numcols + c] = val;             }         }     }     return success; }  bool image::writetobmpfile(const std::string & outputfilename){     bool success = true;     if( m_pixels != null ){     // create bitmap image     bmp outputimage;     outputimage.setsize(m_numcols, m_numrows);     outputimage.setbitdepth( 24 );      double maxval = m_pixels[0];     double minval = m_pixels[0];     // maximum , minimum values     for( int = 1; < m_numrows * m_numcols; ++i ){         if( m_pixels[i] > maxval ){             maxval = m_pixels[i];         }         if( m_pixels[i] <= minval ){             minval = m_pixels[i];         }     }     for( int r = 0; r < m_numrows; ++r ){         for( int c = 0; c < m_numcols; ++c ){             // pixel value , clamp between 0 , 255             double val = 255.0 * (m_pixels[r * m_numcols + c] - minval) / (maxval - minval);             if( val < 0 ){                 val = 0;             }             if( val > 255 ){                 val = 255;             }             // set output color based on mapping             rgbapixel pixelval;             pixelval.blue = (int)val;             pixelval.green = (int)val;             pixelval.red = (int)val;             outputimage.setpixel(c, r, pixelval);         }     }     // write file     success = outputimage.writetofile( outputfilename.c_str() );      } else {         success = false;     }     return success; }

what kind of steps try make program compatible rgb images?


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