diff --git a/README b/README
index a0abe5f5d278df912edd07305f037c8be466a16d..040b46ac0f4081f87cf2e73db33fc94b64339be2 100644
--- a/README
+++ b/README
@@ -1,11 +1,11 @@
 This program compiles on GNU/Linux, Mac and Windows (this port is currently
-in development). It requires:
+in development and may not run). It requires:
 -qmake,
 -make,
 -g++ in GNU/Linux or Mac
--Visual C++ in Windows
+-Visual C++ or MinGW with g++ in Windows
 -Qt 4,
--OpenGL 3.1 or GLew 1.5.2,
+-OpenGL 3.1 or GLew 1.3.5,
 -freeglut (maybe it also works with glut),
 -libjpeg,
 -libpng, and
@@ -16,14 +16,20 @@ project (http://gnuwin32.sourceforge.net). Additionally, you need flex
 because it contains an implementation of unistd.h.
 
 To build in GNU/Linux and Mac, simply run qmake and make. In Windows, it
-would be easier to go thru QtCreator.
+would be easier to go through QtCreator (of course, you can also use
+QtCreator on GNU/Linux and Mac).
 
 To configure, you can set in the file ~/.panorc the following options.
         shader_dir=<path to directory containing the shader files>
-        image_file=<path to the desired input file>
+        image_file=<full path to the desired input file>
+        image_dir=<path to directory containing the input files>
+        fov=<starting value of fov, in degrees>
         max_fov=<starting value of max_fov, in degrees>
+        zblambda=<Zorin-Barr lambda parameter>
+        zbR=<Zorin-Barr R parameter>
 Lines in the file must start with option names, and no spaces should go
 between option names, equal signs and values. If no shader path is set, the
 default is ./shaders/. If no input file is set, or the file is missing, a
-file chooser will be shown at startup. The default value of max_fov is 60
-degrees.
+file chooser will be shown at startup. The default value of max_fov and fov
+are 60 degrees. zblambda and zbR are specified in floating-point, following
+machine locales.
diff --git a/openglcanvas.cpp b/openglcanvas.cpp
index 00b18ba7ad8ac5771b7d8c1e77613510a301056f..0b4ce7e25ff3842cc3d0ac718b90b0f993f95e92 100644
--- a/openglcanvas.cpp
+++ b/openglcanvas.cpp
@@ -205,6 +205,8 @@ void OpenGLCanvas::read_config_file(){
     shader_dir[0]='\0';
     input_image_file=(char*)malloc(512*sizeof(char));
     input_image_file[0]='\0';
+    input_image_dir=(char*)malloc(512*sizeof(char));
+    input_image_dir[0]='\0';
     char *read_line=(char*)malloc(64*sizeof(char));
     struct stat testbuf;
     if(stat(filepath,&testbuf)){
@@ -236,6 +238,12 @@ void OpenGLCanvas::read_config_file(){
                 input_image_file[strlen(line)-12]='\0';
                 fprintf(stderr,"input_image_file=%s\n",input_image_file);
             }
+            // check for 'image_dir' option
+            if(!strncmp(line,"image_dir=",10)){
+                strcpy(input_image_dir,line+10);
+                input_image_dir[strlen(line)-11]='\0';
+                fprintf(stderr,"input_image_dir=%s\n",input_image_dir);
+            }
             // check for 'max_fov' option
             if(!strncmp(line,"max_fov=",8)){
                 strcpy(read_line,line+8);
@@ -243,6 +251,13 @@ void OpenGLCanvas::read_config_file(){
                 fov_max=atof(read_line);
                 fprintf(stderr,"max_fov=%f\n",fov_max);
             }
+            // check for 'fov' option
+            if(!strncmp(line,"fov=",4)){
+                strcpy(read_line,line+4);
+                read_line[strlen(line)-5]='\0';
+                fov=atof(read_line);
+                fprintf(stderr,"fov=%f\n",fov);
+            }
             // check for 'auto_max_fov' option
             if(!strncmp(line,"auto_max_fov=",13)){
                 strcpy(read_line,line+13);
@@ -293,7 +308,7 @@ void OpenGLCanvas::load_image(const char *new_image){
 }
 
 void OpenGLCanvas::change_input_image(){
-        const char *fname=QFileDialog::getOpenFileName(this,tr("Choose Panorama File"),"",FileRead::image_types).toStdString().c_str();
+        const char *fname=QFileDialog::getOpenFileName(this,tr("Choose Panorama File"),input_image_dir,FileRead::image_types).toStdString().c_str();
         if(strlen(fname)>0){
                 load_image(fname);
                 updateGL();
@@ -322,7 +337,7 @@ void OpenGLCanvas::initializeGL(){
     // If the input file does not exist or was not specified.
     struct stat testbuf;
     if(stat(input_image_file,&testbuf)||!strcmp(input_image_file,"")){
-        load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File"),"",FileRead::image_types).toStdString().c_str());
+        load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File"),input_image_dir,FileRead::image_types).toStdString().c_str());
     }else{
         load_image(input_image_file);
     }
diff --git a/openglcanvas.h b/openglcanvas.h
index 064ba3b1a65a0255401d5b7acbc7cbed515a5f72..9bde7348961605fa6ef795962ec0bbd85de4cf98 100644
--- a/openglcanvas.h
+++ b/openglcanvas.h
@@ -88,6 +88,7 @@ private:
 
     char* shader_dir;
     char* input_image_file;
+    char* input_image_dir;
 
     // input image size
     int image_size_x;