diff --git a/Makefile b/Makefile
index 991c2ba..ee52a24 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ dflags     = -MMD -MT $@ -MF $(@:.o=.d) -MP
 cpflags   := -R .bss -R .gint_bss
 
 g1af      := -i "$(ICON_FX)" -n "$(NAME)" --internal="$(INTERNAL)"
-g3af      := -n basic:"$(NAME)" -i uns:"$(ICON_CG_UNS)" -i sel:"$(ICON_CG_SEL)"
+g3af      := -n basic:"" -i uns:"$(ICON_CG_UNS)" -i sel:"$(ICON_CG_SEL)"
 
 #
 #  File listings
@@ -91,13 +91,11 @@ build-cg/%.o: %.c
 # Images
 build-fx/assets/img/%.o: assets-fx/img/%
 	@ mkdir -p $(dir $@)
-	fxconv -i $< -o $@ name:img_$(basename $*)
+	fxconv -i $< -o $@ --fx name:img_$(basename $*)
 
 build-cg/assets/img/%.o: assets-cg/img/%
-	@ echo -ne "\e[31;1mWARNING: image conversion for fxcg50 is not "
-	@ echo -ne "supported yet\e[0m"
 	@ mkdir -p $(dir $@)
-	fxconv -i $< -o $@ name:img_$(basename $*)
+	fxconv -i $< -o $@ --cg name:img_$(basename $*)
 
 # Fonts
 build-fx/assets/fonts/%.o: assets-fx/fonts/%
diff --git a/assets-cg/img/swift.png b/assets-cg/img/swift.png
new file mode 100644
index 0000000..106b360
Binary files /dev/null and b/assets-cg/img/swift.png differ
diff --git a/assets-cg/img/swords.png b/assets-cg/img/swords.png
new file mode 100644
index 0000000..03493f9
Binary files /dev/null and b/assets-cg/img/swords.png differ
diff --git a/include/gintctl/gint.h b/include/gintctl/gint.h
index 3821bed..827a0b5 100644
--- a/include/gintctl/gint.h
+++ b/include/gintctl/gint.h
@@ -11,6 +11,9 @@ void gintctl_gint_hardware(void);
 /* gintctl_gint_timer(): Show the timer status in real-time */
 void gintctl_gint_timer(void);
 
+/* gintctl_gint_bopti(): Test image rendering */
+void gintctl_gint_bopti(void);
+
 #ifdef FX9860G
 
 /* gintctl_gint_gray(): Gray engine tuning */
diff --git a/src/gint/bopti.c b/src/gint/bopti.c
new file mode 100644
index 0000000..1fc77b0
--- /dev/null
+++ b/src/gint/bopti.c
@@ -0,0 +1,33 @@
+#include <gint/display.h>
+#include <gint/keyboard.h>
+#include <gintctl/gint.h>
+
+/* gintctl_gint_bopti(): Test image rendering */
+void gintctl_gint_bopti(void)
+{
+#ifdef FXCG50
+	extern image_t img_swift;
+	extern image_t img_swords;
+
+	int x = 396 - img_swords.width - 16;
+	int y = 16;
+
+	int key = 0;
+
+	while(key != KEY_EXIT)
+	{
+		dclear(C_WHITE);
+		bopti_render_noclip(0, 0, &img_swift, 0, 0, 396, 224);
+		bopti_render_clip(x, y, &img_swords, 0, 0, img_swords.width,
+			img_swords.height);
+		dupdate();
+
+		key = getkey().key;
+
+		if(key == KEY_UP)    y--;
+		if(key == KEY_DOWN)  y++;
+		if(key == KEY_LEFT)  x--;
+		if(key == KEY_RIGHT) x++;
+	}
+#endif
+}
diff --git a/src/gint/timer.c b/src/gint/timer.c
index 0dd3458..0af9d4d 100644
--- a/src/gint/timer.c
+++ b/src/gint/timer.c
@@ -19,8 +19,8 @@ void timer_print(int x, int y, char const *name, uint32_t TCOR, uint32_t TCNT,
 	print(x, y+2*dy, "TCNT");
 	#endif
 
-	print(_(x+6, x+45), y+dy, "%08x", TCOR);
-	print(_(x+60, x+45), _(y+dy, y+2*dy), "%08x", TCNT);
+	print(_(x+6, x+45), y+dy, "%08X", TCOR);
+	print(_(x+60, x+45), _(y+dy, y+2*dy), "%08X", TCNT);
 
 	print(_(x+36, x), _(y, y+3*dy), "%s%s%s",
 		UNIE ? "UNIE " : "",
diff --git a/src/gintctl.c b/src/gintctl.c
index 93ee6b7..8e9f9bb 100644
--- a/src/gintctl.c
+++ b/src/gintctl.c
@@ -39,7 +39,7 @@ struct menu menu_gint = {
 	{ "Keyboard",         NULL },
 	{ "Timers",           gintctl_gint_timer },
 	{ "Real-time clock",  NULL },
-	{ "Image rendering",  NULL },
+	{ "Image rendering",  gintctl_gint_bopti },
 	{ "Text rendering",   NULL },
 	#ifdef FX9860G
 	{ "Gray engine",      gintctl_gint_gray },
diff --git a/src/perf/libprof.c b/src/perf/libprof.c
index 3ac7833..da69413 100644
--- a/src/perf/libprof.c
+++ b/src/perf/libprof.c
@@ -63,14 +63,14 @@ void gintctl_perf_libprof(void)
 		row_title("libprof basics");
 		row_print(1, 1, "This program shows the execution time "
 			"measured");
-		row_print(2, 1, "by libprof for a 100 ms sleep, with 256us "
+		row_print(2, 1, "by libprof for a 100 ms sleep, with 1 us "
 			"added");
 		row_print(3, 1, "each time.");
 		row_print(5, 1, "Press F1 to start the test.");
 
 		if(test)
 		{
-			row_print(7, 1, "Sleep: %.3j us", sleep_delay);
+			row_print(7, 1, "Sleep: %.3j ms", sleep_delay);
 			row_print(8, 1, "Empty: %d us", empty);
 			row_print(9, 1, "Tests: %d", test);
 		}