How do I stop paint shop pro from making photos smaller?

Ran

New member
I have some TIFF photos that are about 80MB. I then opened them in paint shop pro and made some small changes to color, I then chose save as and ticked the uncompressed box and made sure the file was still saved as TIFF format. After I had saved it it was 20MB smaller than my original photo. Does anyone know why this happens?
 
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