diff --git a/.gitignore b/.gitignore
index 91c798f..d2a3277 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ debug
 *.out
 \.idea/
 cmake-build-debug/
+*.su
diff --git a/img/asterix.ppm b/img/asterix.ppm
index e25688a..526e509 100644
Binary files a/img/asterix.ppm and b/img/asterix.ppm differ
diff --git a/src/compress.c b/src/compress.c
index 71c031c..9a87521 100644
--- a/src/compress.c
+++ b/src/compress.c
@@ -13,9 +13,11 @@
  *  \param[in] t_zone Zone à laquelle le pixel est éligible ou non
  *  \return Valeur booléenne, `1` si le pixel est éligible, `0` sinon
  */
-bool sameColor(Pixel *t_pixel, Zone *t_zone) {
-  return t_pixel->r == t_zone->r && t_pixel->g == t_zone->g &&
-         t_pixel->b == t_zone->b;
+uint8_t sameColor(Pixel *t_pixel, Zone *t_zone) {
+  return (t_pixel->r == t_zone->r && t_pixel->g == t_zone->g &&
+          t_pixel->b == t_zone->b)
+             ? 1
+             : 0;
 }
 
 /**
@@ -119,33 +121,45 @@ darray *imgToZones(Image *t_img) {
   const size_t nb_pixels = darraySize(t_img->pixels);
   int64_t i;
   zones = darrayNew(sizeof(Zone));
-
-  /* for each pixel, try to create a new zone */
   for (i = 0; i < (int64_t)nb_pixels; ++i) {
     chooseZoneForPixel(t_img, i, zones);
   }
   return zones;
 }
 
+void write_compressed_file(Image *t_img, FILE *t_output, darray *t_zones) {
+  size_t i, j;
+  Zone *current_zone;
+  Segment *segment;
+  fwrite(&t_img->x, sizeof(t_img->x), 2, t_output);
+  for (i = 0; i < darraySize(t_zones); ++i) {
+    current_zone = darrayGet(t_zones, i);
+    fwrite(&current_zone->r, sizeof(current_zone->r) * 3, 1, t_output);
+    for (j = 0; j < darraySize(current_zone->segments); ++j) {
+      segment = darrayGet(current_zone->segments, j);
+      fwrite(&segment->right_limit, sizeof(Segment), 1, t_output);
+    }
+    darrayDelete(current_zone->segments);
+  }
+}
+
 /**
  *  Convertit une image en zones puis écrit ces zones dans un fichier,
  *  compressant ainsi l'image passée en argument.
  *
- *  \param[in] t_input_file Nom/chemin du fichier ppm d'entrée
+ *  \param[in] t_input_file Nom/chemin du fichier `.ppm` d'entrée
+ *  \param[in] t_output_file Nom/chemin du fichier `.su` de sortie
  */
-void compress(const char *t_input_file) {
+void compress(const char *t_input_file, const char *t_output_file) {
   Image *img;
   darray *zones;
-  Zone *current_zone;
-  size_t i;
+  FILE *output_file;
   img = newImage();
   imageLoadPPM(t_input_file, img);
+  output_file = get_file(t_output_file, "wb");
   zones = imgToZones(img);
-
+  write_compressed_file(img, output_file, zones);
   deleteImage(img);
-  for (i = 0; i < darraySize(zones); ++i) {
-    current_zone = darrayGet(zones, i);
-    darrayDelete(current_zone->segments);
-  }
   darrayDelete(zones);
+  fclose(output_file);
 }
diff --git a/src/compress.h b/src/compress.h
index c5ace1e..7aa31b6 100644
--- a/src/compress.h
+++ b/src/compress.h
@@ -9,7 +9,7 @@
 #include "ppm.h"
 
 /// Teste l’éligibilité d’un pixel à une zone
-bool sameColor(Pixel *t_pixel, Zone *t_zone);
+uint8_t sameColor(Pixel *t_pixel, Zone *t_zone);
 /// Ajoute un pixel et ses pixels connexes à une zone
 void addPixelToSelectedZone(Image *t_img, int64_t t_idx, Zone *t_zone);
 /// Sélectionne la zone correspondant à la couleur d'un pixel
@@ -17,6 +17,6 @@ void chooseZoneForPixel(Image *t_img, int64_t t_idx, darray *zones);
 /// Créé les zones d'une image
 darray *imgToZones(Image *t_img);
 /// Compresse l'image d'entrée
-void compress(const char *t_input_file);
+void compress(const char *t_input_file, const char *t_output_file);
 
 #endif /* SRC_COMPRESS_H_ */
diff --git a/src/main.c b/src/main.c
index aca41a8..a524b28 100644
--- a/src/main.c
+++ b/src/main.c
@@ -132,7 +132,7 @@ int main(int argc, char **argv) {
     printf("input: %s\noutput: %s\n", argresults.input, argresults.output);
   }
   if(argresults.compress) {
-    compress(argresults.input);
+    compress(argresults.input, argresults.output);
   } else {
     puts("Uncompressing...");
   }
diff --git a/src/utilities.c b/src/utilities.c
index c9f0997..4cd1798 100644
--- a/src/utilities.c
+++ b/src/utilities.c
@@ -24,7 +24,7 @@ Pixel *newPixel(uint8_t t_r, uint8_t t_g, uint8_t t_b) {
   res->r = t_r;
   res->g = t_g;
   res->b = t_b;
-  res->visited = false;
+  res->visited = 0;
   return res;
 }
 
diff --git a/src/utilities.h b/src/utilities.h
index bb17a0d..b023d2d 100644
--- a/src/utilities.h
+++ b/src/utilities.h
@@ -11,7 +11,6 @@
 #define SRC_UTILITIES_H_
 
 #include "darray.h"
-#include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>