diff --git a/images/technologies/heidelberg.jpg b/images/technologies/heidelberg.jpg
deleted file mode 100644
index 8aa42f2..0000000
Binary files a/images/technologies/heidelberg.jpg and /dev/null differ
diff --git a/images/technologies/heidelberg.png b/images/technologies/heidelberg.png
new file mode 100644
index 0000000..1bb0d60
Binary files /dev/null and b/images/technologies/heidelberg.png differ
diff --git a/images/technologies/json-schema.jpg b/images/technologies/json-schema.jpg
deleted file mode 100644
index 32c2a9c..0000000
Binary files a/images/technologies/json-schema.jpg and /dev/null differ
diff --git a/images/technologies/json-schema.png b/images/technologies/json-schema.png
new file mode 100644
index 0000000..354ec0f
Binary files /dev/null and b/images/technologies/json-schema.png differ
diff --git a/images/technologies/konika.jpg b/images/technologies/konika.jpg
deleted file mode 100644
index ec5e818..0000000
Binary files a/images/technologies/konika.jpg and /dev/null differ
diff --git a/images/technologies/konika.png b/images/technologies/konika.png
new file mode 100644
index 0000000..5e61912
Binary files /dev/null and b/images/technologies/konika.png differ
diff --git a/images/technologies/magento.jpg b/images/technologies/magento.jpg
deleted file mode 100644
index e9167c3..0000000
Binary files a/images/technologies/magento.jpg and /dev/null differ
diff --git a/images/technologies/magento.png b/images/technologies/magento.png
new file mode 100644
index 0000000..289b12e
Binary files /dev/null and b/images/technologies/magento.png differ
diff --git a/images/technologies/moodle.gif b/images/technologies/moodle.gif
deleted file mode 100644
index 23b9601..0000000
Binary files a/images/technologies/moodle.gif and /dev/null differ
diff --git a/images/technologies/moodle.png b/images/technologies/moodle.png
new file mode 100644
index 0000000..4443538
Binary files /dev/null and b/images/technologies/moodle.png differ
diff --git a/images/technologies/muller-martini.jpg b/images/technologies/muller-martini.jpg
deleted file mode 100644
index 9d0410d..0000000
Binary files a/images/technologies/muller-martini.jpg and /dev/null differ
diff --git a/images/technologies/muller-martini.png b/images/technologies/muller-martini.png
new file mode 100644
index 0000000..202b3dd
Binary files /dev/null and b/images/technologies/muller-martini.png differ
diff --git a/images/technologies/preps.jpg b/images/technologies/preps.jpg
deleted file mode 100644
index c349988..0000000
Binary files a/images/technologies/preps.jpg and /dev/null differ
diff --git a/images/technologies/preps.png b/images/technologies/preps.png
new file mode 100644
index 0000000..715eedc
Binary files /dev/null and b/images/technologies/preps.png differ
diff --git a/images/technologies/rdf-2.jpg b/images/technologies/rdf-2.jpg
deleted file mode 100644
index 91f731e..0000000
Binary files a/images/technologies/rdf-2.jpg and /dev/null differ
diff --git a/images/technologies/rdf-2.png b/images/technologies/rdf-2.png
new file mode 100644
index 0000000..656acb1
Binary files /dev/null and b/images/technologies/rdf-2.png differ
diff --git a/images/technologies/tharstern-print-management.jpg b/images/technologies/tharstern-print-management.jpg
deleted file mode 100644
index 4aef8a2..0000000
Binary files a/images/technologies/tharstern-print-management.jpg and /dev/null differ
diff --git a/images/technologies/tharstern-print-management.png b/images/technologies/tharstern-print-management.png
new file mode 100644
index 0000000..7e357a1
Binary files /dev/null and b/images/technologies/tharstern-print-management.png differ