How to create a BufferedImage object using a .png file on harddisk

For some application of JFreeChart I want to create a BufferedImage object from png file on harddisk.
Can anybody tell me how to achieve this?
Thanks in advance.

See [this thread|http://forum.java.sun.com/thread.jspa?threadID=5144115].

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    *& Report  ZAREPAS30
    REPORT  zarepas30.
    DATA : gs_vbeln                   TYPE  vbak-vbeln,
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           gt_order_items_inx         TYPE  STANDARD TABLE OF bapisditmx,
           gwa_itab2                  TYPE  bapisditmx,
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           gwa_itab3                  TYPE  bapiparnr,
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    Ship-to
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      gs_order_header_inx-updateflag = 'I'.
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      gwa_itab3-partn_numb = p_sold.
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    ship to
      gwa_itab3-partn_role = 'WE'.
      gwa_itab3-partn_numb = p_ship.
      APPEND gwa_itab3 TO  gt_order_partners .
    ITEM DATA
      gwa_itab2-updateflag = 'I'.
    Line item number.
      gwa_itab1-itm_number = '000010'.
      gwa_itab2-itm_number = 'X'.
    Material
      gwa_itab1-material = p_matnr.
      gwa_itab2-material = 'X'.
    Plant
      gwa_itab1-plant    = p_plant.
      gwa_itab2-plant   = 'X'.
    Quantity
      gwa_itab1-target_qty = p_menge.
      gwa_itab2-target_qty = 'X'.
      APPEND gwa_itab1 TO gt_order_items_in.
      APPEND gwa_itab2 TO gt_order_items_inx.
    Line item number.
      gwa_itab1-itm_number = '000020'.
      gwa_itab2-itm_number = 'X'.
    Material
      gwa_itab1-material = p_matnr.
      gwa_itab2-material = 'X'.
    Plant
      gwa_itab1-plant    = p_plant.
      gwa_itab2-plant   = 'X'.
    Quantity
      gwa_itab1-target_qty = p_menge.
      gwa_itab2-target_qty = 'X'.
      APPEND gwa_itab1 TO gt_order_items_in.
      APPEND gwa_itab2 TO gt_order_items_inx.
    CALL FUNCTION 'BAPI_SALESORDER_CREATEFROMDAT2'
      EXPORTING
        order_header_in               = gs_order_header_in
        ORDER_HEADER_INX              = gs_order_header_inx
      IMPORTING
        SALESDOCUMENT                 = gs_vbeln
      tables
        RETURN                        = gt_return
        ORDER_ITEMS_IN                = gt_order_items_in
        ORDER_ITEMS_INX               = gt_order_items_inx
        order_partners                = gt_order_partners.
    Check the return table.
      LOOP AT gt_return into gwa_itab4 WHERE type = 'E' OR type = 'A'.
        EXIT.
      ENDLOOP.
      IF sy-subrc = 0.
        WRITE: / 'Error occured while creating sales order '.
      ELSE.
    Commit the work.
      CALL FUNCTION 'BAPI_TRANSACTION_ROLLBACK'.
        CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'.
        WRITE: / 'Document ', gs_vbeln, ' created'.
      ENDIF.

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