Converting PDF to Tiff file Size

I am using the Aspose.Pdf Product Family for converting PDF To TIFF files.
During my testing I have found that after converting PDF file to tiff file , the size of tiff file in more than PDF file.
Is there any way we can reduce the size of tiff during conversion. The size of tiff is 5-6 times more than PDF file.
Please advice

Thanks,
Sachin