zip created by archive manager is smaller than one created by zip on command line
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I am creating a zip archive of one file, in 3 different ways:
zip -1(least compression) --> 33.8kBzip -9(most compression) --> 32.3kB- archive manager (zip option) --> 26.1kB
Why is there such a big difference?
Related: I'm trying to automatically zip files in Python using the zipfile module, and its performance is comparable to that of zip, but I want its performance to be that of archive manager. However, I can find no documentation on what archive manager does exactly. It claims to use 'zip' but clearly the compression is better...
archive compression zip
asked May 9 at 13:10
PDiracDelta
16819
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up vote
2
down vote
favorite
I am creating a zip archive of one file, in 3 different ways:
zip -1(least compression) --> 33.8kBzip -9(most compression) --> 32.3kB- archive manager (zip option) --> 26.1kB
Why is there such a big difference?
Related: I'm trying to automatically zip files in Python using the zipfile module, and its performance is comparable to that of zip, but I want its performance to be that of archive manager. However, I can find no documentation on what archive manager does exactly. It claims to use 'zip' but clearly the compression is better...
archive compression zip
asked May 9 at 13:10
PDiracDelta
16819
2
Is it an option for you to use another compression tool/method, for examplexz, which usually provides better compression thanzip?
– sudodus
May 9 at 13:33
3
You may check actual file type withfile archive.zip. You can try to open archive withfile-roller archive.zipand see its Properties (Type and Compression ratio).
– N0rbert
May 9 at 15:01
1
@N0rbert it stated that p7zip compression was used. Strangely enough if I try to select .7z in file-roller, the file gets even smaller, and the properties (as in: which algorithm was used with which parameters) are identical!
– PDiracDelta
May 12 at 18:05
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
I am creating a zip archive of one file, in 3 different ways:
zip -1(least compression) --> 33.8kBzip -9(most compression) --> 32.3kB- archive manager (zip option) --> 26.1kB
Why is there such a big difference?
Related: I'm trying to automatically zip files in Python using the zipfile module, and its performance is comparable to that of zip, but I want its performance to be that of archive manager. However, I can find no documentation on what archive manager does exactly. It claims to use 'zip' but clearly the compression is better...
archive compression zip
asked May 9 at 13:10
PDiracDelta
16819
I am creating a zip archive of one file, in 3 different ways:
zip -1(least compression) --> 33.8kBzip -9(most compression) --> 32.3kB- archive manager (zip option) --> 26.1kB
Why is there such a big difference?
Related: I'm trying to automatically zip files in Python using the zipfile module, and its performance is comparable to that of zip, but I want its performance to be that of archive manager. However, I can find no documentation on what archive manager does exactly. It claims to use 'zip' but clearly the compression is better...
archive compression zip
asked May 9 at 13:10
PDiracDelta
16819
asked May 9 at 13:10
PDiracDelta
16819
asked May 9 at 13:10
PDiracDelta
16819
asked May 9 at 13:10
PDiracDelta
16819
16819
2
Is it an option for you to use another compression tool/method, for examplexz, which usually provides better compression thanzip?
– sudodus
May 9 at 13:33
3
You may check actual file type withfile archive.zip. You can try to open archive withfile-roller archive.zipand see its Properties (Type and Compression ratio).
– N0rbert
May 9 at 15:01
1
@N0rbert it stated that p7zip compression was used. Strangely enough if I try to select .7z in file-roller, the file gets even smaller, and the properties (as in: which algorithm was used with which parameters) are identical!
– PDiracDelta
May 12 at 18:05
add a comment |Â
2
Is it an option for you to use another compression tool/method, for examplexz, which usually provides better compression thanzip?
– sudodus
May 9 at 13:33
3
You may check actual file type withfile archive.zip. You can try to open archive withfile-roller archive.zipand see its Properties (Type and Compression ratio).
– N0rbert
May 9 at 15:01
1
@N0rbert it stated that p7zip compression was used. Strangely enough if I try to select .7z in file-roller, the file gets even smaller, and the properties (as in: which algorithm was used with which parameters) are identical!
– PDiracDelta
May 12 at 18:05
2
2
Is it an option for you to use another compression tool/method, for example
xz, which usually provides better compression than zip?– sudodus
May 9 at 13:33
Is it an option for you to use another compression tool/method, for example
xz, which usually provides better compression than zip?– sudodus
May 9 at 13:33
3
3
You may check actual file type with
file archive.zip. You can try to open archive with file-roller archive.zip and see its Properties (Type and Compression ratio).– N0rbert
May 9 at 15:01
You may check actual file type with
file archive.zip. You can try to open archive with file-roller archive.zip and see its Properties (Type and Compression ratio).– N0rbert
May 9 at 15:01
1
1
@N0rbert it stated that p7zip compression was used. Strangely enough if I try to select .7z in file-roller, the file gets even smaller, and the properties (as in: which algorithm was used with which parameters) are identical!
– PDiracDelta
May 12 at 18:05
@N0rbert it stated that p7zip compression was used. Strangely enough if I try to select .7z in file-roller, the file gets even smaller, and the properties (as in: which algorithm was used with which parameters) are identical!
– PDiracDelta
May 12 at 18:05
add a comment |Â
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2
Is it an option for you to use another compression tool/method, for example
xz, which usually provides better compression thanzip?– sudodus
May 9 at 13:33
3
You may check actual file type with
file archive.zip. You can try to open archive withfile-roller archive.zipand see its Properties (Type and Compression ratio).– N0rbert
May 9 at 15:01
1
@N0rbert it stated that p7zip compression was used. Strangely enough if I try to select .7z in file-roller, the file gets even smaller, and the properties (as in: which algorithm was used with which parameters) are identical!
– PDiracDelta
May 12 at 18:05