Problems with get_blob using Cursor

I saved an image by converting it to a array of bytes , in a column in Sqlite with data type byte . When I make a cursor to fetch this image from the bank using the Cursor class and the get_blob() method, it says it can not convert.

What am I doing wrong?

public List<Locais> listaDeMemorias() {

    DataBaseApp dtbApp = new DataBaseApp( this );
    SQLiteDatabase dtb = dtbApp.getReadableDatabase();

    try {
        Cursor c = dtb.rawQuery("select idLocal,dsLocal,dtVisita,dsObservacoes,imagem from Locais", null);
        Date data = new Date(System.currentTimeMillis());

        while (c.moveToNext()) {
            System.out.println("Tem dados");

            int id = c.getInt( 0 );
            System.out.println( "ID: " + id );

            byte[] imgData = c.getBlob(4);

            Bitmap img = BitmapFactory.decodeByteArray( imgData, 0,  imgData.length);


            Locais locais = new Locais(c.getInt(0),c.getString(1),new Timestamp( c.getLong( 2 )),c.getString(3),img);

            System.out.println( "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" );
            listaLocais.add(locais);
        }


        return listaLocais;

    } catch ( Exception e ) {
        System.out.println( e.getMessage() );
    } finally {
        dtb.close();
    }

    System.out.println( "Enviando lista de locais: " + listaLocais.size() );

    return listaLocais;
}