Tif Image Size

Kinnie
Global Mapper UserTrusted User
When I calibrate maps and converting them to tif image, I end up with BIG file sizes. A single 1/100,000 size sheet (ex Perry-Castañeda Library Map Collection) ends up as a 137.2Mb file. What settings should I use to get a smaller file size (without losing detail).
Assistance would be appreciated.
Assistance would be appreciated.
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