compress pictures

[Michael Havens]

are the options 'A' and 'r' in 'tar' the same thing?

On Wed, Nov 30, 2011 at 5:07 PM, Matt Graham <danceswithcrows at usa.net>wrote:

> From: Michael Havens <bmike1 at gmail.com>
> > I want to compress a bunch [of] pictures to put a bunch on my zip
> > drive. What is the best program to use?
>
> Most image formats are already compressed in some way.  JPEG, GIF, TIFF,
> and
> PNG are almost always compressed.  Compressing an already-compressed data
> set
> doesn't usually buy you very much at all, 1 or 2% if that.
>
> > I was thinking 'zip' would be good
>
> See above.  zip will work, though tar combined with bzip2 (or xz/lzma) may
> be
> more space-efficient at the cost of it taking longer to compress and
> uncompress the data.  That's "tar cjf images.tar.bz2 images/" or "tar cJf
> images.tar.xz images/" to create compressed tarballs of everything in the
> images/ dir.  Replace "tar cjf" with "tar xjf" to uncompress.
>
> --
> Matt G / Dances With Crows
> The Crow202 Blog:  http://crow202.org/wordpress/
> There is no Darkness in Eternity/But only Light too dim for us to see
>
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-- 
:-)~MIKE~(-:
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