@Longsworduser If you use xnview you can clean up the images more: Select b/w pages, then Batch Processing. Format: PNG, then in Transformations: Add: Map - Levels. Black: 30, White: 225. Add: Filters - Enhance Focus. Add: Convert to Greyscale 64. Add: Convert to Greyscale 16 (Optional. For smaller size). Total archive size reduced to 63MB.