Question:
WinRAR Compresses 25.9MB to 25.9MB,... How the...?
TekNurd
2010-02-09 02:14:22 UTC
WinRAR Compresses 25.9MB of Photos [22pix] to 25.9MB,... How the...?
How can i really Compress these using WinRAR?

and ive gone through the different compressing options: Store, good, best etc...

Thanks...
Five answers:
2010-02-09 04:54:50 UTC
Easy, JPEG files are already compress so they cannot be optimised any more w/o editing the file and changing properties (size, resolution, etc.).



It is a binary file and binary files cannot be compressed due to the "randomness" of the data inside. There are no patterns or features for compression algorithms to take advantage.



You will find no WinRAR, WinZip, 7Zip, algorithm that will give you more than 1%.
Michael from UK
2010-02-09 02:25:08 UTC
If the photos are held in JPEG format, then they are already compressed, so WinRar has nothing more to do. You can't keep compressing forever to make things smaller.



There might be a WinRar option that says 'dont even try compressing JPEGs' (there usually is for things like .rar or .zip) so it might not even try. If you switch that off it might help, but not by a lot.



Compressing images/photos works best using jpeg, and decreasing the quality will increase compression. But winrar is lossless so not a good option.
2015-01-24 19:59:47 UTC
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?
2014-10-04 08:02:56 UTC
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