diff --git a/img2cpi.c b/img2cpi.c
index f3ee294..0c9f44a 100644
--- a/img2cpi.c
+++ b/img2cpi.c
@@ -40,11 +40,11 @@ const extern struct palette DEFAULT_PALETTE, DEFAULT_GRAY_PALETTE;
 
 struct arguments {
   int width, height;
-  enum character_mode {
-    CHARACTER_BLOCK,
-    CHARACTER_CHAR_PRECISE,
-    CHARACTER_CHAR_FAST,
-  } character_mode;
+  enum conversion_mode {
+    CONVERSION_BLOCK,
+    CONVERSION_CHAR_PRECISE,
+    CONVERSION_CHAR_FAST,
+  } conversion_mode;
   enum cpi_version {
     CPI_VERSION_AUTO,
     CPI_VERSION_RAW,
@@ -73,7 +73,7 @@ struct arguments {
 } args = {
   .width = 4 * 8 - 1, // 4x3 blocks screen
   .height = 3 * 6 - 2,
-  .character_mode = CHARACTER_CHAR_PRECISE,
+  .conversion_mode = CONVERSION_CHAR_PRECISE,
   .cpi_version = CPI_VERSION_AUTO,
   .placement = PLACEMENT_FULL,
   .input_path = NULL,
@@ -204,7 +204,7 @@ int main(int argc, char **argv) {
   }
 
   struct image *canvas;
-  if (args.character_mode == CHARACTER_BLOCK) {
+  if (args.conversion_mode == CONVERSION_BLOCK) {
     canvas = image_new(args.width * 2, args.height * 3);
   } else {
     canvas = image_new(args.width * 8, args.height * 11);
@@ -257,18 +257,18 @@ int main(int argc, char **argv) {
     return EXIT_FAILURE;
   }
 
-  switch (args.character_mode) {
-  case CHARACTER_BLOCK:
+  switch (args.conversion_mode) {
+  case CONVERSION_BLOCK:
     convert_2x3(quantized_image, characters);
     break;
-  case CHARACTER_CHAR_PRECISE:
+  case CONVERSION_CHAR_PRECISE:
     convert_8x11(quantized_image, characters, true);
     break;
-  case CHARACTER_CHAR_FAST:
+  case CONVERSION_CHAR_FAST:
     convert_8x11(quantized_image, characters, false);
     break;
   default:
-    fprintf(stderr, "BUG: invalid args.character_mode\n");
+    fprintf(stderr, "BUG: invalid args.conversion_mode\n");
     return EXIT_FAILURE;
   }
 
@@ -320,7 +320,7 @@ bool parse_cmdline(int argc, char **argv) {
         exit(EXIT_SUCCESS);
         break;
       case 'f': // --fast
-        args.character_mode = CHARACTER_BLOCK;
+        args.conversion_mode = CONVERSION_BLOCK;
         fprintf(stderr, "Warning: `--fast` is deprecated, use `--mode block` instead\n");
         if (args.cpi_version != CPI_VERSION_AUTO) {
           fprintf(stderr, "Warning: text mode ignores version\n");
@@ -329,11 +329,11 @@ bool parse_cmdline(int argc, char **argv) {
       case 'm': // --mode
         {
           if (0 == strcmp(optarg, "block") || 0 == strcmp(optarg, "fast") || 0 == strcmp(optarg, "2x3")) {
-            args.character_mode = CHARACTER_BLOCK;
+            args.conversion_mode = CONVERSION_BLOCK;
           } else if (0 == strcmp(optarg, "char") || 0 == strcmp(optarg, "char-precise") || 0 == strcmp(optarg, "8x11") || 0 == strcmp(optarg, "6x9")) {
-            args.character_mode = CHARACTER_CHAR_PRECISE;
+            args.conversion_mode = CONVERSION_CHAR_PRECISE;
           } else if (0 == strcmp(optarg, "char-fast") || 0 == strcmp(optarg, "8x11-fast") || 0 == strcmp(optarg, "6x9-fast")) {
-            args.character_mode = CHARACTER_CHAR_FAST;
+            args.conversion_mode = CONVERSION_CHAR_FAST;
           }
         }
         break;