Images guidelines inconsistent

The Capture the image section of the style guide says not to capture the entire page:

Capture the most relevant area of the page. Don't include unnecessary white space or areas of the page that don't help illustrate your point. Also, don't include the entire page if you don't have to, but also ensure the image contains enough information to allow the user to determine where things are.

But also says to capture all areas of the product, including the left nav, for an image size larger than 1200px wide:

Be consistent. Find a browser window size that works for you that also displays all areas of the product, including the left navigation (usually > 1200px wide). For consistency, use this browser window size for your screenshots by installing a browser extension for setting a window to a specific size (for example, Window Resizer for Google Chrome).

The Save the image section also says to keep the images less than 100K in file size. This is difficult given the above guidelines for making the images very large.