diff --git a/sdk/core/core.cpp b/sdk/core/core.cpp
index 22a078e..e09176a 100644
--- a/sdk/core/core.cpp
+++ b/sdk/core/core.cpp
@@ -112,7 +112,8 @@ struct AlgorithmCore
         QScopedPointer<Gallery> g(Gallery::make(gallery));
         if (g.isNull()) return FileList();
         FileList fileList = g->files();
-        if (!fileList.isEmpty() && g->isUniversal()) return fileList; // Already enrolled
+        if (!fileList.isEmpty() && g->isUniversal() && !gallery.contains("append"))
+            return fileList; // Already enrolled
 
         const TemplateList i(TemplateList::fromInput(input));
         if (i.isEmpty()) return FileList(); // Nothing to enroll
@@ -133,13 +134,12 @@ struct AlgorithmCore
                 if (data.isEmpty()) break;
                 const int numFiles = data.size();
 
-                if (!Globals->backProject){
-                    data >> *transform;
+                if (Globals->backProject) {
+                    TemplateList backProjectedData;
+                    transform->backProject(data, backProjectedData);
+                    data = backProjectedData;
                 } else {
-                    // I don't really know if this makes sense.
-                    //TemplateList dst;
-                    transform->backProject(data, data);
-                    //data = dst;
+                    data >> *transform;
                 }
 
                 g->writeBlock(data);
diff --git a/sdk/plugins/gallery.cpp b/sdk/plugins/gallery.cpp
index de4b3a2..d0f954b 100644
--- a/sdk/plugins/gallery.cpp
+++ b/sdk/plugins/gallery.cpp
@@ -60,15 +60,20 @@ class galGallery : public Gallery
     void init()
     {
         gallery.setFileName(file);
-
-        if (gallery.exists()) {
-            if (!gallery.open(QFile::ReadOnly)) qFatal("Can't open [%s] for reading.", qPrintable(gallery.fileName()));
-            stream.setDevice(&gallery);
+        QtUtils::touchDir(gallery);
+
+        if (file.contains("append")) {
+            if (!gallery.open(QFile::Append))
+                qFatal("Can't open [%s] for appending.", qPrintable(gallery.fileName()));
+        } else if (gallery.exists()) {
+            if (!gallery.open(QFile::ReadOnly))
+                qFatal("Can't open [%s] for reading.", qPrintable(gallery.fileName()));
         } else {
-            QtUtils::touchDir(gallery);
-            if (!gallery.open(QFile::WriteOnly)) qFatal("Can't open [%s] for writing.", qPrintable(gallery.fileName()));
-            stream.setDevice(&gallery);
+            if (!gallery.open(QFile::WriteOnly))
+                qFatal("Can't open [%s] for writing.", qPrintable(gallery.fileName()));
         }
+
+        stream.setDevice(&gallery);
     }
 
     bool isUniversal() const
diff --git a/share/openbr/doc b/share/openbr/doc
index 1031e9e..504960d 160000
--- a/share/openbr/doc
+++ b/share/openbr/doc
@@ -1 +1 @@
-Subproject commit 1031e9e416427f5dd8e9f4e7ff4dd74632626c22
+Subproject commit 504960df12db25e09c39ab098fb8614c1db51617