94 Answer ― Brighten

void brighten( colorImage img, int red, int grn, int blu )
{
  int r, c ;
  pixel pix;

  for ( r=0; r<img.nrows; r++ )
    for ( c=0; c<img.ncols; c++ )
    {
      pix = getColorPixel( img, r, c ) ;
 
      if      ( pix.red+red > 255 ) pix.red  = 255;
      else if ( pix.red+red < 0   ) pix.red  = 0;
      else                          pix.red += red;

      if      ( pix.grn+grn > 255 ) pix.grn  = 255;
      else if ( pix.grn+grn < 0   ) pix.grn  = 0;
      else                          pix.grn += grn;

      if      ( pix.blu+blu > 255 ) pix.blu = 255;
      else if ( pix.blu+blu < 0   ) pix.blu = 0;
      else                          pix.blu += blu;

      setColorPixel( img, r, c, pix );
    }
}

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