diff --git a/.DS_Store b/.DS_Store
index 7855ac4..ce48ee8 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/Makefile b/Makefile
index 22f8da3..211878b 100644
--- a/Makefile
+++ b/Makefile
@@ -58,7 +58,7 @@ tiffs: ## convert images/ to images-tiff/ Depends on IM
 	echo $(images)
 	for i in $(images); \
 	do tiff=`basename $$i .jpg`.tiff; \
-	convert -density 300 $$i images-tiff/$$tiff; \
+	convert $$i -density 300 -alpha on images-tiff/$$tiff; \
 	echo $$tiff; \
 	done;