A little more information would help.
What scanner are you using?
What program are you using?
If you are scanning the letter as a document you will not be able to save it as a JPG you will need to scan it as a picture.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?