diff -r 64e456ab823d -r a23b5089b9c3 ccdemos/spheres_shadow.cc
--- a/ccdemos/spheres_shadow.cc	Fri Apr 04 13:54:47 2008 +0200
+++ b/ccdemos/spheres_shadow.cc	Tue Apr 08 01:05:12 2008 +0200
@@ -118,7 +118,7 @@
 		new_image(&img, w, h, 3);
 
 		Float *fd = fdata;
-		for (char *cd = img->data; cd != img->data + w*h*3; cd++, fd++) {
+		for (unsigned char *cd = img->data; cd != img->data + w*h*3; cd++, fd++) {
 			if (*fd > 1.0)
 				*cd = 255;
 			else