diff --git a/src/Tools/tim_tool/src/gui/file_tab.rs b/src/Tools/tim_tool/src/gui/file_tab.rs
index df6461da..9c7635f9 100644
--- a/src/Tools/tim_tool/src/gui/file_tab.rs
+++ b/src/Tools/tim_tool/src/gui/file_tab.rs
@@ -15,12 +15,13 @@ impl FileTab {
     const EIGHT_BIT_NAME:&str  = "8 bit";
     const FULL_COLOR_NAME:&str = "Full color";
 
-    fn update_encoding_options(&self, width: u32, height: u32, has_palette: bool) -> Result<(), Error> {
+    fn update_encoding_options(&self, width: u32, height: u32, has_palette: bool) -> Result<&str, Error> {
         self.encoding_options.clear();
 
         if has_palette {
-            let has_4bit = width%4 == 0;
-            let has_8bit = width%2 == 0;
+            let mut selected_str = Self::EIGHT_BIT_NAME;
+            let     has_4bit     = width%4 == 0;
+            let     has_8bit     = width%2 == 0;
 
             if !has_4bit && !has_8bit {
                 return Err(Error::from_text(format!("Image width must be multiple of 2 and or 4 ({}/{})", width, height)));
@@ -28,17 +29,18 @@ impl FileTab {
 
             if has_4bit {
                 self.encoding_options.push(SharedString::from(format!("{} ({}/{})", Self::FOUR_BIT_NAME, width/4, height)));
+                selected_str = Self::FOUR_BIT_NAME;
             }
 
             if has_8bit {
                 self.encoding_options.push(SharedString::from(format!("{} ({}/{})", Self::EIGHT_BIT_NAME, width/2, height)));
             }
-            Ok(())
+            Ok(selected_str)
         }
 
         else {
             self.encoding_options.push(SharedString::from(format!("{} ({}/{})", Self::FULL_COLOR_NAME, width, height)));
-            Ok(())
+            Ok(Self::FULL_COLOR_NAME)
         }
     }
 
@@ -55,7 +57,11 @@ impl FileTab {
         self.encoding_options.clear();
         main_window.set_file_tab_browse_path("".into());
         main_window.set_file_tab_image_data(Image::default());
+        main_window.set_file_tab_image_width(0);
+        main_window.set_file_tab_image_height(0);
         main_window.set_file_tab_palette_data(Image::default());
+        main_window.set_file_tab_palette_width(0);
+        main_window.set_file_tab_palette_height(0);
         main_window.set_file_tab_image_name("".into());
         main_window.set_file_tab_enable(false);
     }
@@ -79,7 +85,7 @@ impl FileTab {
             main_window.set_file_tab_image_name("".into());
         }
 
-        self.update_encoding_options(image_size.width, image_size.height, has_palette)?;
+        main_window.set_file_tab_selected_encoding(SharedString::from(self.update_encoding_options(image_size.width, image_size.height, has_palette)?));
         main_window.set_file_tab_enable(true);
         Ok(())
     }
diff --git a/src/Tools/tim_tool/ui/tab/file-tab.slint b/src/Tools/tim_tool/ui/tab/file-tab.slint
index 2c2c7442..a9a9e078 100644
--- a/src/Tools/tim_tool/ui/tab/file-tab.slint
+++ b/src/Tools/tim_tool/ui/tab/file-tab.slint
@@ -93,9 +93,8 @@ component ConvertImageWidget inherits Rectangle {
                         VerticalLayout {
                             alignment: center;
                             ComboBox {
-                                model:         root.encoding_options;
-                                enabled:       root.enable_view;
-                                current-value: root.encoding_options[0];
+                                model:   root.encoding_options;
+                                enabled: root.enable_view;
 
                                 selected(current-value) => {
                                     root.selected_encoding = current-value;