diff --git a/pkg/downscale/grid.go b/pkg/downscale/grid.go
index 57b7bf7..4deab89 100644
--- a/pkg/downscale/grid.go
+++ b/pkg/downscale/grid.go
@@ -1,5 +1,10 @@
 package downscale
 
+import (
+	"image"
+	"image/color"
+)
+
 type sub struct {
 	image.Image
 	image.Rectangle