diff --git a/examples/game_of_life/src/main.rs b/examples/game_of_life/src/main.rs
index 555d5ca..49cc4ca 100644
--- a/examples/game_of_life/src/main.rs
+++ b/examples/game_of_life/src/main.rs
@@ -39,8 +39,8 @@ fn main() {
 
 fn iteration(field: PixelGrid) -> PixelGrid {
     let mut next = field.clone();
-    for x in 0..field.width {
-        for y in 0..field.height {
+    for x in 0..field.width() {
+        for y in 0..field.height() {
             let old_state = field.get(x, y);
             let neighbors = count_neighbors(&field, x as i32, y as i32);
 
@@ -64,8 +64,8 @@ fn count_neighbors(field: &PixelGrid, x: i32, y: i32) -> i32 {
 
             if nx < 0
                 || ny < 0
-                || nx >= field.width as i32
-                || ny >= field.height as i32
+                || nx >= field.width() as i32
+                || ny >= field.height() as i32
             {
                 continue; // pixels outside the grid do not count
             }
@@ -85,8 +85,8 @@ fn make_random_field(probability: f64) -> PixelGrid {
     let mut field = PixelGrid::max_sized();
     let mut rng = rand::thread_rng();
     let d = distributions::Bernoulli::new(probability).unwrap();
-    for x in 0..field.width {
-        for y in 0..field.height {
+    for x in 0..field.width() {
+        for y in 0..field.height() {
             field.set(x, y, rng.sample(d));
         }
     }
diff --git a/servicepoint2/src/byte_grid.rs b/servicepoint2/src/byte_grid.rs
index a54dd3a..674c208 100644
--- a/servicepoint2/src/byte_grid.rs
+++ b/servicepoint2/src/byte_grid.rs
@@ -1,10 +1,8 @@
 /// A 2D grid of bytes
 #[derive(Debug, Clone, PartialEq)]
 pub struct ByteGrid {
-    /// Size in the x-axis
-    pub width: usize,
-    /// Size in the y-axis
-    pub height: usize,
+    width: usize,
+    height: usize,
     data: Vec<u8>,
 }
 
@@ -57,6 +55,16 @@ impl ByteGrid {
     pub fn mut_data_ref(&mut self) -> &mut [u8] {
         self.data.as_mut_slice()
     }
+
+    /// the size in x-direction
+    pub fn width(&self) -> usize {
+        self.width
+    }
+
+    /// the height in y-direction
+    pub fn height(&self) -> usize {
+        self.height
+    }
 }
 
 impl From<ByteGrid> for Vec<u8> {
diff --git a/servicepoint2/src/command.rs b/servicepoint2/src/command.rs
index 0e89440..635b1a2 100644
--- a/servicepoint2/src/command.rs
+++ b/servicepoint2/src/command.rs
@@ -74,8 +74,8 @@ impl From<Command> for Packet {
                     CommandCode::CharBrightness.into(),
                     x,
                     y,
-                    grid.width as u16,
-                    grid.height as u16,
+                    grid.width() as u16,
+                    grid.height() as u16,
                 ),
                 grid.into(),
             ),
@@ -95,11 +95,11 @@ impl From<Command> for Packet {
                 compression,
             ) => {
                 debug_assert_eq!(pixel_x % 8, 0);
-                debug_assert_eq!(pixels.width % 8, 0);
+                debug_assert_eq!(pixels.width() % 8, 0);
 
                 let tile_x = pixel_x / TILE_SIZE;
-                let tile_w = pixels.width as u16 / TILE_SIZE;
-                let pixel_h = pixels.height as u16;
+                let tile_w = pixels.width() as u16 / TILE_SIZE;
+                let pixel_h = pixels.height() as u16;
                 let payload = into_compressed(compression, pixels.into());
                 let command = match compression {
                     CompressionCode::Uncompressed => {
@@ -153,8 +153,8 @@ impl From<Command> for Packet {
                     CommandCode::Cp437Data.into(),
                     x,
                     y,
-                    grid.width as u16,
-                    grid.height as u16,
+                    grid.width() as u16,
+                    grid.height() as u16,
                 ),
                 grid.into(),
             ),
diff --git a/servicepoint2/src/pixel_grid.rs b/servicepoint2/src/pixel_grid.rs
index 2ab8595..0ee4894 100644
--- a/servicepoint2/src/pixel_grid.rs
+++ b/servicepoint2/src/pixel_grid.rs
@@ -3,10 +3,8 @@ use crate::{BitVec, PIXEL_HEIGHT, PIXEL_WIDTH};
 /// A grid of pixels stored in packed bytes.
 #[derive(Debug, Clone, PartialEq)]
 pub struct PixelGrid {
-    /// the width in pixels
-    pub width: usize,
-    /// the height in pixels
-    pub height: usize,
+    width: usize,
+    height: usize,
     bit_vec: BitVec,
 }
 
@@ -80,6 +78,16 @@ impl PixelGrid {
     pub fn mut_data_ref(&mut self) -> &mut [u8] {
         self.bit_vec.mut_data_ref()
     }
+
+    /// the size in x-direction in pixels
+    pub fn width(&self) -> usize {
+        self.width
+    }
+
+    /// the height in y-direction in pixels
+    pub fn height(&self) -> usize {
+        self.height
+    }
 }
 
 impl From<PixelGrid> for Vec<u8> {