Exporting TColorGridSeries to MetaFile (enhanced or otherwise) give picture
as if the "SmoothBitmap" property is set to true, even if this property is set to false. This doesn't happen if exporting to JPEG, PNG or Bitmap.

This happens in C++Builder XE6 with TChart V140512 and C++Builder XE5 with TChart version 131119. 

Tasks to replicate:
1)Create new project
2)Add TChart component and add TColorGridSeries
3)In Form OnCreate event handler add line:
  Series1->FillSampleValues(100);
4)Add TButton
5)In Button's OnClick event handler add the line:
  TeeExport( this, Chart1 );

See Attached png file of screen capture for results.

Code for above:

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
#include <VCLTee.TeeJPEG.hpp>
#include <VCLTee.TeeGIF.hpp>
#include <VCLTee.TeePNG.hpp>
#include <VCLTee.TeePDFCanvas.hpp>
#include <VCLTee.TeExport.hpp>
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma link "VCLTee.TeeSurfa"
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
	Series1->FillSampleValues(100);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
	TeeExport( this, Chart1 );
}
//---------------------------------------------------------------------------