DanPBrown
Offline
Buy and Sell: On
Registered: Nov 21, 2005
Total Posts: 331
Country: United States
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 Re: Zip comression | |
Here is his website,
http://www.timgrey.com/
His statement was part of a DDQ email. Here is the question and his answer,
I am ready to Save work done on an TIFF image. I am presented with a window offering me 4 Compression choices, None, LCW, ZIP & JPEG. Since these are images I use to print from time to time in ranges from 5x7" to 12x18" for greeting cards up to wall prints I want the quality to be as good as it gets, because I also place a small label on the back advertising Enlargements available. I don't make changes to these. I have the Master file in addition. Which would be the best option, assuming I have an internal 2nd HDD which I use to back up my work at 500GB?
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I can immediately suggest that you exclude ZIP and JPEG compression from consideration, as both will affect the quality of the image. Obviously the "None" option won't affect image quality, as it results in no compression at all. This leave the LZW option (named after Lempel, Ziv, and Welch, who created the algorithm). This option applies compression to the file itself, but not to the image data. In other words, it represents file compression, not image compression. As a a result it results in exactly the same quality as the "None" option for compression, but at a significantly reduced file size.
So, the bottom line is that None and LZW are your best options. If you don't have a reason not to use LZW (such as compatibility issues, which are typically caused by the technology not having been licensed by a particular software tool), I would suggest using LZW to minimize file size while retaining maximum image quality.
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