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145

answers:

1
Q: 

The TIFF Group 5 compression.

Are TIFF Group 5 compression and LZW compression the same thing?

+3  A: 

I've been working with TIFF files for a long time and I've never heard LZW compression referred to as TIFF GROUP 5. I've always called them simply LZW Compressed Tiffs.

The only "group" designation for compression are:
CCITT Group 3
CCITT Group 4

I think you may be confusing the TIFF format versions which now go up to 6.

More Info from the owner of the format (Adobe): Tiff Resources

JohnFx  2009-10-22 23:59:18

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