diff --git a/.image_optim.yml b/.image_optim.yml
index e0416a670d0..c7196cbb295 100644
--- a/.image_optim.yml
+++ b/.image_optim.yml
@@ -1,10 +1,11 @@
 skip_missing_workers: true
-allow_lossy: false
+allow_lossy: true
 # PNG
 advpng: false
 optipng: false
 pngcrush: false
-pngout: true
-pngquant: false
+pngout: false
+pngquant:
+  quality: !ruby/range 10..90
 # JPG
 jpegrecompress: false