--- ../jpeg-6b-orig/cjpeg.c	1998-03-21 10:21:49 +0900
+++ cjpeg.c	2007-12-25 00:43:24 +0900
@@ -160,6 +160,10 @@
 #ifdef TARGA_SUPPORTED
   fprintf(stderr, "  -targa         Input file is Targa format (usually not needed)\n");
 #endif
+  fprintf(stderr, "  -xdpi N        Specify X resolution in dots per inch\n");
+  fprintf(stderr, "  -ydpi N        Specify Y resolution in dots per inch\n");
+  fprintf(stderr, "  -xdpcm N       Specify X resolution in dots per centimeter\n");
+  fprintf(stderr, "  -ydpcm N       Specify Y resolution in dots per centimeter\n");
   fprintf(stderr, "Switches for advanced users:\n");
 #ifdef DCT_ISLOW_SUPPORTED
   fprintf(stderr, "  -dct int       Use integer DCT method%s\n",
@@ -411,6 +415,58 @@
       /* Input file is Targa format. */
       is_targa = TRUE;
 
+    } else if (keymatch(arg, "xdpi", 4)) {
+      /* Set dots per inch on the X axis. */
+      int val;
+
+      if (++argn >= argc)	/* advance to next argument */
+	usage();
+      if (sscanf(argv[argn], "%d", &val) != 1)
+	usage();
+      if (val < 1 || val > 65535)
+	usage();
+      cinfo->density_unit = 1;	/* density in dots per inch */
+      cinfo->X_density = val;
+
+    } else if (keymatch(arg, "ydpi", 4)) {
+      /* Set dots per inch on the Y axis. */
+      int val;
+
+      if (++argn >= argc)	/* advance to next argument */
+	usage();
+      if (sscanf(argv[argn], "%d", &val) != 1)
+	usage();
+      if (val < 1 || val > 65535)
+	usage();
+      cinfo->density_unit = 1;	/* density in dots per inch */
+      cinfo->Y_density = val;
+
+    } else if (keymatch(arg, "xdpcm", 4)) {
+      /* Set dots per centimeter on the X axis. */
+      int val;
+
+      if (++argn >= argc)	/* advance to next argument */
+	usage();
+      if (sscanf(argv[argn], "%d", &val) != 1)
+	usage();
+      if (val < 1 || val > 65535)
+	usage();
+      cinfo->density_unit = 2;	/* density in dots per centimeter */
+      cinfo->X_density = val;
+
+    } else if (keymatch(arg, "ydpcm", 4)) {
+      /* Set dots per centimeter on the Y axis. */
+      int val;
+
+      if (++argn >= argc)	/* advance to next argument */
+	usage();
+      if (sscanf(argv[argn], "%d", &val) != 1)
+	usage();
+      if (val < 1 || val > 65535)
+	usage();
+      cinfo->density_unit = 2;	/* density in dots per centimeter */
+      cinfo->Y_density = val;
+
     } else {
       usage();			/* bogus switch */
     }