There is a download called Fast Image Resizer- just google it, then download it. It is very easy (I use an old school Apple, MacBook Air. I’d love to get a new one and I must say if and when I do I want to get either a hot pink one or red one. Plus, because I have the first MacBookAir model that Apple put out it doesn’t hook up to the television; therefore, we can’t watch our Netflix or I Love Film).
By condensing your files it will be easier for Nielsen to receive the front cover when you send it to them. If you send it to them then it will be on their electronic file and the picture will come up on certain bookstore websites such as Waterstones.