diff --git a/bookwyrm/imagegenerators.py b/bookwyrm/imagegenerators.py
index bad9028e..fd1eb498 100644
--- a/bookwyrm/imagegenerators.py
+++ b/bookwyrm/imagegenerators.py
@@ -3,73 +3,73 @@ from imagekit.processors import ResizeToFit
 
 class BookXSmallWebp(ImageSpec):
     processors = [ResizeToFit(80, 80)]
-    format = 'WEBP'
-    options = { 'quality': 95 }
+    format = "WEBP"
+    options = {"quality": 95}
 
 class BookXSmallJpg(ImageSpec):
     processors = [ResizeToFit(80, 80)]
-    format = 'JPEG'
-    options = { 'quality': 95 }
+    format = "JPEG"
+    options = {"quality": 95}
 
 class BookSmallWebp(ImageSpec):
     processors = [ResizeToFit(100, 100)]
-    format = 'WEBP'
-    options = { 'quality': 95 }
+    format = "WEBP"
+    options = {"quality": 95}
 
 class BookSmallJpg(ImageSpec):
     processors = [ResizeToFit(100, 100)]
-    format = 'JPEG'
-    options = { 'quality': 95 }
+    format = "JPEG"
+    options = {"quality": 95}
 
 class BookMediumWebp(ImageSpec):
     processors = [ResizeToFit(150, 150)]
-    format = 'WEBP'
-    options = { 'quality': 95 }
+    format = "WEBP"
+    options = {"quality": 95}
 
 class BookMediumJpg(ImageSpec):
     processors = [ResizeToFit(150, 150)]
-    format = 'JPEG'
-    options = { 'quality': 95 }
+    format = "JPEG"
+    options = {"quality": 95}
 
 class BookLargeWebp(ImageSpec):
     processors = [ResizeToFit(200, 200)]
-    format = 'WEBP'
-    options = { 'quality': 95 }
+    format = "WEBP"
+    options = {"quality": 95}
 
 class BookLargeJpg(ImageSpec):
     processors = [ResizeToFit(200, 200)]
-    format = 'JPEG'
-    options = { 'quality': 95 }
+    format = "JPEG"
+    options = {"quality": 95}
 
 class BookXLargeWebp(ImageSpec):
     processors = [ResizeToFit(250, 250)]
-    format = 'WEBP'
-    options = { 'quality': 95 }
+    format = "WEBP"
+    options = {"quality": 95}
 
 class BookXLargeJpg(ImageSpec):
     processors = [ResizeToFit(250, 250)]
-    format = 'JPEG'
-    options = { 'quality': 95 }
+    format = "JPEG"
+    options = {"quality": 95}
 
 class BookXxLargeWebp(ImageSpec):
     processors = [ResizeToFit(500, 500)]
-    format = 'WEBP'
-    options = { 'quality': 95 }
+    format = "WEBP"
+    options = {"quality": 95}
 
 class BookXxLargeJpg(ImageSpec):
     processors = [ResizeToFit(500, 500)]
-    format = 'JPEG'
-    options = { 'quality': 95 }
+    format = "JPEG"
+    options = {"quality": 95}
 
-register.generator('bw:book:xsmall:webp', BookXSmallWebp)
-register.generator('bw:book:xsmall:jpg', BookXSmallJpg)
-register.generator('bw:book:small:webp', BookSmallWebp)
-register.generator('bw:book:small:jpg', BookSmallJpg)
-register.generator('bw:book:medium:webp', BookMediumWebp)
-register.generator('bw:book:medium:jpg', BookMediumJpg)
-register.generator('bw:book:large:webp', BookLargeWebp)
-register.generator('bw:book:large:jpg', BookLargeJpg)
-register.generator('bw:book:xlarge:webp', BookXLargeWebp)
-register.generator('bw:book:xlarge:jpg', BookXLargeJpg)
-register.generator('bw:book:xxlarge:webp', BookXxLargeWebp)
-register.generator('bw:book:xxlarge:jpg', BookXxLargeJpg)
+register.generator("bw:book:xsmall:webp", BookXSmallWebp)
+register.generator("bw:book:xsmall:jpg", BookXSmallJpg)
+register.generator("bw:book:small:webp", BookSmallWebp)
+register.generator("bw:book:small:jpg", BookSmallJpg)
+register.generator("bw:book:medium:webp", BookMediumWebp)
+register.generator("bw:book:medium:jpg", BookMediumJpg)
+register.generator("bw:book:large:webp", BookLargeWebp)
+register.generator("bw:book:large:jpg", BookLargeJpg)
+register.generator("bw:book:xlarge:webp", BookXLargeWebp)
+register.generator("bw:book:xlarge:jpg", BookXLargeJpg)
+register.generator("bw:book:xxlarge:webp", BookXxLargeWebp)
+register.generator("bw:book:xxlarge:jpg", BookXxLargeJpg)