diff --git a/prebuilt/common/bootanimation/halfres/240.zip b/prebuilt/common/bootanimation/halfres/240.zip
index 8ae2a4df..59735d06 100644
Binary files a/prebuilt/common/bootanimation/halfres/240.zip and b/prebuilt/common/bootanimation/halfres/240.zip differ
diff --git a/prebuilt/common/bootanimation/halfres/320.zip b/prebuilt/common/bootanimation/halfres/320.zip
index 2ec2f731..7497da0c 100644
Binary files a/prebuilt/common/bootanimation/halfres/320.zip and b/prebuilt/common/bootanimation/halfres/320.zip differ
diff --git a/prebuilt/common/bootanimation/halfres/360.zip b/prebuilt/common/bootanimation/halfres/360.zip
index 31ea3947..f1247f70 100644
Binary files a/prebuilt/common/bootanimation/halfres/360.zip and b/prebuilt/common/bootanimation/halfres/360.zip differ
diff --git a/prebuilt/common/bootanimation/halfres/540.zip b/prebuilt/common/bootanimation/halfres/540.zip
index 0e77fb50..35b631cf 100644
Binary files a/prebuilt/common/bootanimation/halfres/540.zip and b/prebuilt/common/bootanimation/halfres/540.zip differ
diff --git a/prebuilt/common/bootanimation/halfres/600.zip b/prebuilt/common/bootanimation/halfres/600.zip
index 82f3d71b..ec352f7f 100644
Binary files a/prebuilt/common/bootanimation/halfres/600.zip and b/prebuilt/common/bootanimation/halfres/600.zip differ
diff --git a/prebuilt/common/bootanimation/halfres/768.zip b/prebuilt/common/bootanimation/halfres/768.zip
index 131c7d23..f87e834f 100644
Binary files a/prebuilt/common/bootanimation/halfres/768.zip and b/prebuilt/common/bootanimation/halfres/768.zip differ
diff --git a/prebuilt/common/bootanimation/halfres/800.zip b/prebuilt/common/bootanimation/halfres/800.zip
index 1710801b..051db72e 100644
Binary files a/prebuilt/common/bootanimation/halfres/800.zip and b/prebuilt/common/bootanimation/halfres/800.zip differ
diff --git a/prebuilt/common/bootanimation/halfres/generate-half-res-anims.sh b/prebuilt/common/bootanimation/halfres/generate-half-res-anims.sh
index e50ec60c..70f6fad6 100755
--- a/prebuilt/common/bootanimation/halfres/generate-half-res-anims.sh
+++ b/prebuilt/common/bootanimation/halfres/generate-half-res-anims.sh
@@ -14,9 +14,9 @@ for i in $HALF_RES_RESOLUTIONS; do
 		unzip ../../$i.zip desc.txt
 	else
 		unzip ../../$i.zip
-		for j in */*.jpg; do
-			convert $j -resize 50% tmp.jpg
-			mv tmp.jpg $j
+		for j in */*.[pP][nN][gG]; do
+			convert $j -resize 50% tmp.png
+			mv tmp.png $j
 		done
 	fi
 	zip -r0 ../$i.zip .