diff --git a/src/core/colorspace.js b/src/core/colorspace.js
index 74b43a1c4..1b66ab6d5 100644
--- a/src/core/colorspace.js
+++ b/src/core/colorspace.js
@@ -396,7 +396,9 @@ class ColorSpace {
               }
             }
           }
-          throw new FormatError(`Unrecognized ColorSpace: ${cs.name}`);
+          // Fallback to the default gray color space.
+          warn(`Unrecognized ColorSpace: ${cs.name}`);
+          return this.singletons.gray;
       }
     }
     if (Array.isArray(cs)) {
@@ -474,10 +476,14 @@ class ColorSpace {
           const range = params.getArray("Range");
           return new LabCS(whitePoint, blackPoint, range);
         default:
-          throw new FormatError(`Unimplemented ColorSpace object: ${mode}`);
+          // Fallback to the default gray color space.
+          warn(`Unimplemented ColorSpace object: ${mode}`);
+          return this.singletons.gray;
       }
     }
-    throw new FormatError(`Unrecognized ColorSpace object: ${cs}`);
+    // Fallback to the default gray color space.
+    warn(`Unrecognized ColorSpace object: ${cs}`);
+    return this.singletons.gray;
   }
 
   /**