diff --git a/modules/twainui/hg_settingdialog.cpp b/modules/twainui/hg_settingdialog.cpp
index 5aeaa8bb..68c6930d 100644
--- a/modules/twainui/hg_settingdialog.cpp
+++ b/modules/twainui/hg_settingdialog.cpp
@@ -1397,59 +1397,64 @@ void hg_settingdialog::slot_gammaButtonClicked()
 
     setPicClrTool dlg(colorMode, this);
 
-    QList<QPoint> grayKeyTable;
-    for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_GRAY]; ++i)
+    if (1 == colorMode)
     {
-        uchar x = m_gammaData.pt_gray[i];
-        uchar y = m_gammaData.table[256 * GAMMA_INDEX_GRAY + x];
-        grayKeyTable.append(QPoint(x, y));
-    }
+        QList<QPoint> grayKeyTable;
+        for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_GRAY]; ++i)
+        {
+            uchar x = m_gammaData.pt_gray[i];
+            uchar y = m_gammaData.table[256 * GAMMA_INDEX_GRAY + x];
+            grayKeyTable.append(QPoint(x, y));
+        }
 
-    if (!grayKeyTable.empty())
-    {
-        dlg.setGrayKeyTable(grayKeyTable);
+        if (!grayKeyTable.empty())
+        {
+            dlg.setGrayKeyTable(grayKeyTable);
+        }
     }
-
-    QList<QPoint> colorKeyTable;
-    for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_COLOR]; ++i)
+    else if (0 == colorMode)
     {
-        uchar x = m_gammaData.pt_color[i];
-        uchar y = m_gammaData.table[256 * GAMMA_INDEX_COLOR + x];
-        colorKeyTable.append(QPoint(x, y));
-    }
+        QList<QPoint> colorKeyTable;
+        for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_COLOR]; ++i)
+        {
+            uchar x = m_gammaData.pt_color[i];
+            uchar y = m_gammaData.table[256 * GAMMA_INDEX_COLOR + x];
+            colorKeyTable.append(QPoint(x, y));
+        }
 
-    QList<QPoint> rKeyTable;
-    for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_RED]; ++i)
-    {
-        uchar x = m_gammaData.pt_red[i];
-        uchar y = m_gammaData.table[256 * GAMMA_INDEX_RED + x];
-        rKeyTable.append(QPoint(x, y));
-    }
+        QList<QPoint> rKeyTable;
+        for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_RED]; ++i)
+        {
+            uchar x = m_gammaData.pt_red[i];
+            uchar y = m_gammaData.table[256 * GAMMA_INDEX_RED + x];
+            rKeyTable.append(QPoint(x, y));
+        }
 
-    QList<QPoint> gKeyTable;
-    for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_GREEN]; ++i)
-    {
-        uchar x = m_gammaData.pt_green[i];
-        uchar y = m_gammaData.table[256 * GAMMA_INDEX_GREEN + x];
-        gKeyTable.append(QPoint(x, y));
-    }
+        QList<QPoint> gKeyTable;
+        for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_GREEN]; ++i)
+        {
+            uchar x = m_gammaData.pt_green[i];
+            uchar y = m_gammaData.table[256 * GAMMA_INDEX_GREEN + x];
+            gKeyTable.append(QPoint(x, y));
+        }
 
-    QList<QPoint> bKeyTable;
-    for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_BLUE]; ++i)
-    {
-        uchar x = m_gammaData.pt_blue[i];
-        uchar y = m_gammaData.table[256 * GAMMA_INDEX_BLUE + x];
-        bKeyTable.append(QPoint(x, y));
-    }
+        QList<QPoint> bKeyTable;
+        for (int i = 0; i < m_gammaData.count[GAMMA_INDEX_BLUE]; ++i)
+        {
+            uchar x = m_gammaData.pt_blue[i];
+            uchar y = m_gammaData.table[256 * GAMMA_INDEX_BLUE + x];
+            bKeyTable.append(QPoint(x, y));
+        }
 
-    QVector<QList<QPoint>> keyTableList;
-    if (!colorKeyTable.empty() && !rKeyTable.empty() && !gKeyTable.empty() && !bKeyTable.empty())
-    {
-        keyTableList.append(colorKeyTable);
-        keyTableList.append(rKeyTable);
-        keyTableList.append(gKeyTable);
-        keyTableList.append(bKeyTable);
-        dlg.setRGBKeyTable(keyTableList);
+        QVector<QList<QPoint>> keyTableList;
+        if (!colorKeyTable.empty() && !rKeyTable.empty() && !gKeyTable.empty() && !bKeyTable.empty())
+        {
+            keyTableList.append(colorKeyTable);
+            keyTableList.append(rKeyTable);
+            keyTableList.append(gKeyTable);
+            keyTableList.append(bKeyTable);
+            dlg.setRGBKeyTable(keyTableList);
+        }
     }
 
     int rgbTypeIndex = 0;
@@ -1460,7 +1465,6 @@ void hg_settingdialog::slot_gammaButtonClicked()
     dlg.setRgbAndColorType(rgbTypeIndex, colorTypeIndex);
     if (dlg.exec())
     {
-        memset(&m_gammaData, 0, sizeof(m_gammaData));
         clicked_gamma_ = true;
 
         if (1 == colorMode)