diff --git a/packages/optimizer/lib/transformers/OptimizeImages.js b/packages/optimizer/lib/transformers/OptimizeImages.js
index e27fc5f42..f3f6d060c 100644
--- a/packages/optimizer/lib/transformers/OptimizeImages.js
+++ b/packages/optimizer/lib/transformers/OptimizeImages.js
@@ -24,13 +24,37 @@ const {isValidImageSrcURL} = require('../URLUtils');
// this avoids generating srcsets for images with a responsive layout where width/height define the aspect ration.
const MIN_WIDTH_TO_ADD_SRCSET_IN_RESPONSIVE_LAYOUT = 100;
-// All legimate srcset widths.
-const SRCSET_WIDTH = [39, 56, 82, 100, 150, 300, 500, 750, 1000, 1500, 2000, 2500];
+// All supported srcset widths.
+const SRCSET_WIDTH = [
+ 39,
+ 47,
+ 56,
+ 68,
+ 82,
+ 100,
+ 120,
+ 150,
+ 180,
+ 220,
+ 270,
+ 330,
+ 390,
+ 470,
+ 560,
+ 680,
+ 820,
+ 1000,
+ 1200,
+ 1440,
+ 1750,
+ 2000,
+ 2500,
+];
// Don't generate srcsets for images larger than the supported maximum
const MAX_IMG_SIZE = SRCSET_WIDTH[SRCSET_WIDTH - 1];
-// The maximum number of values. We'll take the initial image width and generate more width values by
+// The maximum number of srcset source. We'll take the initial image width and generate more width values by
// multiplying by multiples of 1.0 up the given max value (e.g. width=300, maxSrcsetValues=3 => 1 * 300, 2 * 300, 3 * 300)
// and match the result to the closest supported srcset width (see above).
const MAX_SRCSET_VALUE_COUNT = 3;
@@ -122,7 +146,7 @@ class OptimizeImages {
this.log = config.log;
this.imageOptimizer = config.imageOptimizer;
this.srcsetWidth = new SrcsetWidth();
- // TODO turn these into options
+ // TODO turn these into options https://github.com/ampproject/amp-toolbox/issues/804
this.maxImageWidth = MAX_IMG_SIZE;
this.maxSrcsetValues = MAX_SRCSET_VALUE_COUNT;
}
diff --git a/packages/optimizer/spec/transformers/valid/OptimizeImages/adds_srcset/expected_output.html b/packages/optimizer/spec/transformers/valid/OptimizeImages/adds_srcset/expected_output.html
index a6736bd3f..23649cc1d 100644
--- a/packages/optimizer/spec/transformers/valid/OptimizeImages/adds_srcset/expected_output.html
+++ b/packages/optimizer/spec/transformers/valid/OptimizeImages/adds_srcset/expected_output.html
@@ -1,13 +1,13 @@
-
+
-
+
\ No newline at end of file