Compressing TIFF Files

When I retired there were no digital cameras to be had So I stayed with film up to about 5 years ago. This year, unable to resist temptation any longer, I went for it and bought a K20D. I am finding the learning curve, particularly concerning image processing both in-camera and out, rather steep.
So could some kind soul please tell me how to compress TIFF files? My RAW files which start out at around 8Mb are, after processing (in PSE9), and being saved as TIFF files, finishing up at as much as 45Mb....

LZW is a TIFF option that compresses losslessly. You'll find the option when you Save As.

The downside is that images will take longer to open and may not open on all computers.

On the other hand, you could save as a best quality JPEG.

Some Tiffs especially document scans can be compressed quite
well and stored within a ZIP file.

Thank you both for your help. It seems where file size is concerned I need to move up a gear or three. Since purchasing the K20 in August I have accumulated 2.5Gb of image files - in spite of fairly large scale deletions.
I would be interested to know how those more experienced in the use of digital dslr cameras than I, organise and store their work.

Roger

Roger, for what it is worth.....

I process my raw files with Silkypix raw converter and save the resultant jpg together with the original raw file in Photoshop Elements.

If I want to do more extensive processing in PSE then I save the raw file as a TIFF. Then open the TIFF in PSE and eventually save as jpg.

Only rarely do I keep the TIFF as well as the jpg and raw file.

I save my RAW files, and the resultant Jpeg, at the highest quality, in PSE.

I actually never keep the worked on RAW - only the original unaltered version.

If I want to go back to work more on the photo I save it as a .PSD instead.

I never use TIFF - way too big a file for me.