save png again to avoid issue
diff --git a/netbeans.apache.org/src/content/tutorials/images/db_cancelGlyph.png b/netbeans.apache.org/src/content/tutorials/images/db_cancelGlyph.png
index f9fcdbf..6c5cb43 100644
--- a/netbeans.apache.org/src/content/tutorials/images/db_cancelGlyph.png
+++ b/netbeans.apache.org/src/content/tutorials/images/db_cancelGlyph.png
Binary files differ
diff --git a/netbeans.apache.org/src/content/tutorials/images/db_command_16.png b/netbeans.apache.org/src/content/tutorials/images/db_command_16.png
index 1ee0cc9..b8d6ac7 100644
--- a/netbeans.apache.org/src/content/tutorials/images/db_command_16.png
+++ b/netbeans.apache.org/src/content/tutorials/images/db_command_16.png
Binary files differ
diff --git a/netbeans.apache.org/src/content/tutorials/images/db_custom_displayable_16.png b/netbeans.apache.org/src/content/tutorials/images/db_custom_displayable_16.png
index 428ac9f..636d677 100644
--- a/netbeans.apache.org/src/content/tutorials/images/db_custom_displayable_16.png
+++ b/netbeans.apache.org/src/content/tutorials/images/db_custom_displayable_16.png
Binary files differ
diff --git a/netbeans.apache.org/src/content/tutorials/images/db_item_16.png b/netbeans.apache.org/src/content/tutorials/images/db_item_16.png
index 55b3058..5320612 100644
--- a/netbeans.apache.org/src/content/tutorials/images/db_item_16.png
+++ b/netbeans.apache.org/src/content/tutorials/images/db_item_16.png
Binary files differ
diff --git a/netbeans.apache.org/src/content/tutorials/images/db_postCodeGlyph.png b/netbeans.apache.org/src/content/tutorials/images/db_postCodeGlyph.png
index aa9f88f..16f6632 100644
--- a/netbeans.apache.org/src/content/tutorials/images/db_postCodeGlyph.png
+++ b/netbeans.apache.org/src/content/tutorials/images/db_postCodeGlyph.png
Binary files differ
diff --git a/netbeans.apache.org/src/content/tutorials/images/db_preCodeGlyph.png b/netbeans.apache.org/src/content/tutorials/images/db_preCodeGlyph.png
index 33f743b..467e7a0 100644
--- a/netbeans.apache.org/src/content/tutorials/images/db_preCodeGlyph.png
+++ b/netbeans.apache.org/src/content/tutorials/images/db_preCodeGlyph.png
Binary files differ