private void MakeButton_Click(object sender, EventArgs e)
        {
            if (!File.Exists(AFilename.Text))
            {
                return;
            }
            if (BFilename.Text == "")
            {
                return;
            }
            if (InputFormRef.IsPleaseWaitDialog(this))
            {//2重割り込み禁止
                return;
            }

            try
            {
                //少し時間がかかるので、しばらくお待ちください表示.
                using (InputFormRef.AutoPleaseWait pleaseWait = new InputFormRef.AutoPleaseWait(this))
                {
                    DecreaseColor dc = new DecreaseColor();

                    Bitmap src = new Bitmap(AFilename.Text);

                    int  width             = (int)this.ConvertWidth.Value;
                    int  height            = (int)this.ConvertHeight.Value;
                    int  yohaku            = (int)this.ConvertYohaku.Value;
                    int  paletteno         = (int)this.ConvertPaletteNo.Value;
                    bool isReserve1stColor = (this.ConvertReserveColor.SelectedIndex == 1);

                    Bitmap src2;
                    if (this.ConvertSizeMethod.SelectedIndex == 0)
                    {
                        src2 = ImageUtil.BitmapSizeChange(src, 0, 0, width, height);
                    }
                    else
                    {
                        src2 = ImageUtil.BitmapScale(src, width, height);
                    }
                    bool   ignoreTSA = IgnoreTSA.Checked;
                    Bitmap dest      = dc.Convert(src2, paletteno, yohaku, isReserve1stColor, ignoreTSA);

                    U.BitmapSave(dest, BFilename.Text);

                    src.Dispose();
                    src2.Dispose();
                    dest.Dispose();
                }
                //エクスプローラで選択しよう
                U.SelectFileByExplorer(BFilename.Text);
            }
            catch (System.Runtime.InteropServices.ExternalException ee)
            {
                R.ShowStopError(R.ExceptionToString(ee));
            }
            catch (System.ArgumentOutOfRangeException ee)
            {
                R.ShowStopError(R.ExceptionToString(ee));
            }
        }