Explain Compression Options when Saving as TIFF

Adobe PhotoShop CS5 offers three options for convertion of a RAW file to TIFF (LZW, ZIP, and JPEG).
I would appreciate if someone can help me to make sense of the following.
I do not understand which of these employ the "run-length encoding" scheme that should make the TIFF
file much smaller than the RAW file. I have used all three types of compression but the only one that
resulted in a subtantial reduction in size was the JPEG compression.
The TIFF file with no compression is actually twice the size of the raw file.
What are the LZW and ZIP compressions actually doing?
Thanks

How did you arrive at the conclusion that the tif should be smaller than the RAW-file?
jpg is a lossy compression, so best avoided uo until the final output.
As for lzw and zip (from the Help):
LZW (Lemple-Zif-Welch) Lossless compression; supported by TIFF, PDF, GIF, and PostScript language file formats. Most useful for images with large areas of single color.
ZIP Lossless compression; supported by PDF and TIFF file formats. Like LZW, ZIP compression is most effective for images that contain large areas of single color.
So image-noise for example can negate all savings and I think zip with 16bit is a problem.

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Explain Compression Options when Saving as TIFF

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