You can set the screenshot format to something other than png using a simple Terminal command. Some screenshots will save you storage space, but scarfing quality.
Note: This is Club MacMost exclusive content. To view this video click the thumbnail below to go to the post as Patreon.com. Once there you will be able to view the video as long as you are logged into your Patreon account and a current supporter of MacMost at the "Club MacMost" or higher level.