Compression decreases the size of data.

learn more… | top users | synonyms (1)

0
votes
1answer
891 views

Should Windows 8 be taking up 40GB of my HDD when my drive is compressed?

I want to install a game that requires 12GB on my computer with an HDD that shows 53GB total capacity, so I cleared everything off of it. All documents, pictures, downloads, desktop, etc empty ...
1
vote
1answer
210 views

restoring files after doing rsync with compression

I understand that you can rsync with arg -z and -a for compress and archive. Can someone tell me with these options, does it affect the files being backed up in any way if ever they need to be ...
0
votes
1answer
60 views

Why this scanned book image has no background?

If you save this image on your desktop, you see it's background color as your desktop color. If you open it with Adobe Photoshop, its background id checkered which means it has no background. It's ...
0
votes
2answers
30 views

Should I archive old folders

I have many folders on my hard drives that contain many media files and logs for old websites I have created for clients that I rarely ever access now. I want to know aside from compressing them what ...
0
votes
1answer
140 views

Uncompress bz2 file from command line on Windows

Is there any tool in the Windows command line that allows me to do this? Otherwise, is there any light and portable application that will allow me to? Related question, can I rename .bz2 extension to ...
0
votes
1answer
97 views

Does copying files via MTP over USB compress them?

I'm trying to backup my phone to a computer running Ubuntu 14.04 LTS, and I noticed that one of my backup images looked noticeably more pixelated, even when viewed at the same size as my phone screen. ...
3
votes
2answers
138 views

Is Gzip supposed to honor original filename during decompress?

This question stems from a Crypto++ library question on Stack Overflow: How to add filename to archive if compressing using Gzip class?. Gzip, as specified in RFC 1952 has an optional field for the ...
2
votes
1answer
138 views

Samsung 850 Pro SSD compression

I intend on buying the Samsung 850 Pro SSD, to use as an external drive via USB and I am wondering if it uses any kind of compression, like SandForce based SSD drives? I am fairly obsessive about data ...
0
votes
3answers
1k views

How to automate Adobe Acrobat XI Standard to re-compress a lot of PDFs?

I've about 15 gigabyte of PDFs scanned with an old version of Adobe Acrobat that are huge. Adobe Acrobat XI Standard that comes with my new scanner has an option to (it seems lossless) recompress ...
0
votes
1answer
181 views

How to batch compress sub subfolders?

I'm on Windows Server 2012 R2. I have a directory that looks like this: Folder01 Subfolder 1 File1 File2 File3 Subfolder 2 File1 File2 Subfolder 3 ...
0
votes
1answer
235 views

BTRFS filesystem, compression and copy on write

I'm planning about moving from etx4 to BTRFS filesystem on my pc and backup server. I'm very interested in the BTRFS snapshot feature (I have understood it uses the copy on write feature) and the ...
0
votes
1answer
487 views

reducing the size of PDF file of scanned images

I downloaded this PDF file from a website which is 350 KB in size with 20 pages. All pages are scanned images. I extracted the images using Adobe Acrobat Pro which are 1.32 MB in size collectively ...
0
votes
1answer
143 views

is it safe to compress the File History folder?

Is it safe to compress the File History folder in Windows 8? Mine has grown rather big and a lot of the files types would compress well. However, I dont see any information on compressing it. It ...
0
votes
1answer
327 views

Is there a way to compress folders individually using 7zip on a large collection of folders?

How can 260 folders be zipped individually using 7zip with a single command? The person who originally asked this question voluntarily deleted the post. Since it was an interesting task, I ...
1
vote
0answers
26 views

General-purpose program for RLE compression

We have to deal with very large columnar files with fixed-size data and lots of padding bytes coming from mainframe. I would like to evaluate different compression techniques and their impact on ...
0
votes
2answers
236 views

Best format for compression of large amount of small files

I tried to use .rar and I get a great rate of compression. However it take a lot of time to show the folder structure when I open the .rar file (tried different programs), it looks it is needed to ...
-2
votes
2answers
107 views

7Zip Zipping up directories

I want to use 7 zip to compress and archive folders but I want it to exclude existing .7z files if they exist and not duplicate them with a .7z.7z ext I found this but it duplicates the already zipped ...
3
votes
1answer
1k views

How to dump and compress MySQL database in Windows only using command line

Is it possible to backup and compress just like in Linux: mysqldump --all-databases | lzma > all.sql.gz I only have smb:// and cmd.exe access via winexe, so no GUI (remote desktop is not enabled, ...
0
votes
3answers
5k views

How to reduce the size of windows OS Iso file?

I have an Iso file of windows 8.1 pro with December '14 updates. The problem is the file is too big to be burned on a normal 4.7GB DVD , its around 4.8. Now is it possible to remove a few updates so ...
128
votes
6answers
17k views

How is PNG lossless given that it has a compression parameter?

PNG files are said to use lossless compression. However, whenever I am in an image editor, such as GIMP and try to save an image as a PNG file, it asks for the compression parameter, which ranges ...
2
votes
0answers
337 views

Pacmd dynamic range compression Ubuntu 14.04

I used the answer at the link below to successfully set Dynamic Range Compression on my Ubuntu media box running Ubuntu 14.04 (SteamOS session, so no Ubuntu desktop session available). Realtime sound ...
5
votes
1answer
10k views

Extracting a tar.gz file returns, “This does not look like a tar archive.”

I have a tar.gz file and I want to extract it using terminal. I used following commands: tar tvzf ldtp_3.5.0.orig.tar.gz and tar -xvzf ldtp_3.5.0.orig.tar.gz. However, I get the same result for both ...
0
votes
1answer
49 views

Is it possible to perform Deduplication recursively?

If anybody is familiar with the concept of Deduplication (If not,read link on wikipedia) http://en.wikipedia.org/wiki/Data_deduplication Is it possible to perform Deduplication recursively i.e. ...
-2
votes
4answers
1k views

Is it faster to compress files before copying? [duplicate]

I have around 80 GB of data I need copy to an external hard drive. Would it be faster to compress all the files first and then copy over? Or would the time it takes to compress and decompress take ...
-4
votes
1answer
69 views

How is this RAR archive able to achieve such a good compression ratio?

The RAR archive found here (direct download) contains a single AVI video file which is 42MB in size. The RAR archive is only 500KB. How can the archive achieve such a high compression ratio?
1
vote
2answers
273 views

tar reverse of '--to-command', or: compressing tar entries individually, or: tar with plenty of large files

I would like to create tar gzip archive, but do it the reverse manner of what is most commonly done -- have the files in the archive be compressed individually rather than compress the entire archive: ...
2
votes
0answers
380 views

Why do IPSec VPN Compression and Windows Remote Desktop not work together?

I just discovered a strange problem. I connect to a remote network via VPN. Within this VPN is a separate Microsoft Small Business Server (which does not provide the VPN, another device does this). So ...
1
vote
1answer
93 views

Deleting unpacked tar.gz files after unpacking incorrectly

I recently unpacked a set of backup files in RHEL3 - 2.4kernel with tar via: tar -xvf backupfile It started to error out a bunch and I aborted thinking that maybe it was a gzip instead. Unpacking ...
2
votes
1answer
168 views

How to open multiple TGA files then save them compressed as 24 bits in Photoshop?

I have a huge amount of TGA files from the game Counter-Strike (environment files such as sky, grass, water etc) and they are pretty big. There were some other TGA files that I manually opened and ...
3
votes
1answer
263 views

Not sure gzip has decompressed the whole file

I am decompressing a list of files using gzip: At any time it skips from one file to the next, I read (I am using the verbose option): star_60out.txt.gz: 91.0% -- replaced with star_60out.txt or ...
1
vote
0answers
180 views

Is there an alternative to httpfs2 to mount web urls in Linux?

Currently I use httpfs2 to mount direct web urls in the filesystem. For example a rar archive which has to be decompressed, but I don't have enough space on my VPS to download AND then decompress the ...
0
votes
1answer
45 views

Can i save modification in compressed file folder? [duplicate]

When modifying documents that are directly opened from compressed file folders like RAR or Zip, I normally close them without dragging the files out of the rar or zip file. I used to do this in the ...
0
votes
2answers
183 views

Determine type of archive file in Linux

I have an archive file with .tar.gz as extension grabbed from http://www.oracle.com (it is the Java Runtime Environment). I tried to decompress it using tar -xvf and tar -zxvf and it says gzip: stdin: ...
0
votes
3answers
108 views

decompressing a 50 GB archive to a 100 GB drive

So I moved hosts today and I put all content from the old host into a single archive. The archive took 20 minutes to compress and one hour to transfer the tar file to the new host (Linux CentOS ...
0
votes
0answers
91 views

True crypt container issue

I had created a true crypt container in my external HDD but stupidly ticked the "compress contents to save disk space" option from file properties. Now when I attempt to mount my container with true ...
0
votes
1answer
260 views

Create Compressed Back Up Image Mac Mavericks

I have a 3TB external drive, that for some reason is partitioned as a single Master Boot Record partition. Seagate, go figure. I'm running a 1TB Mac with 10.9.4 and about 380GB used space. My ...
1
vote
1answer
490 views

zip file (with spaces in the files name) to unzip and rename files and zip back

I'm trying to rename the contents of a zip file to match the name of the zip file with a batch file. This is exactly what I'm trying to do : ...
0
votes
3answers
130 views

Reduce bandwidth usage when web browsing? [closed]

If I have a 1GB tethering allowance per month. Is it possible to somehow compress the websites I visit so they use less bandwidth to reach my screen?
-1
votes
1answer
79 views

Creating a shell script to compress files using Cygwin [closed]

I've got a minor project wherein I'm to create a few shell scripts in Windows and run them through Cygwin for Linux files. At least that's how it was described to me. Any suggestions would be great.
4
votes
2answers
5k views

Cannot decompress .tar.xz file, getting “xz: Cannot exec: No such file or directory” from tar

Per How do I uncompress a tarball that uses .xz?, I tried tar xf php-5.6.0RC4.tar.xz and tar -xJf php-5.6.0RC4.tar.xz and in both cases I get the following: tar (child): xz: Cannot exec: No such file ...
0
votes
0answers
19 views

Compressing an OS after some slight changes has yielded massively different results - why?

I am using SUSE Linux on a Virtual Machine through VMWare Workstation. This morning, I zipped up a copy of the folder containing my VM (.vmx, .vmdk, .vmem, single snapshot and all) and sent it to my ...
0
votes
1answer
189 views

Bulk resize / compress TIFF files [closed]

We support and host an EMR for several medical practices; these practices scan images into this software stored as flat files (TIFF mostly). Due to poor user training (people scanning text pages as ...
3
votes
1answer
2k views

Adobe photoshop “not enough ram” message opening a 60 MB TIFF file

I am working with Windows 7 x64 on a full HD monitor, Intel i5-2500K and 8 GB RAM, currently available 5,5GB. I tried to extend photoshop's memory usage and scratch disk settings as following: But ...
1
vote
1answer
6k views

7-Zip: Unsupported Compression Method while trying to extract a zipx file that consists of JPEGs

A zipx file I received consists of .csv files and .jpeg files. I used 7-zip to extract them. While the .csv files were sucessfully extracted, the JPEG files didn't. The error was something like this ...
7
votes
2answers
1k views

What does combining compression methods in 7z actually do?

The 7z command-line tool lets you specify multiple compression methods, e.g.: # 7-zip archive type, strongest (9) compression, methods PPMd, BCJ2, LZMA2 $ 7z a -t7z -mx=9 -m0=PPMd -m1=BCJ2 -m2=LZMA2 ...
1
vote
4answers
1k views

How to batch compress images with Imagemagick or similar command or program in Linux

I recently learned about the convert command from imagemagick which I have used to compress many pictures that I have for personal use, and for a blog that I have. In my experience, Imagemagick is the ...
0
votes
0answers
318 views

How to NTFS compress the system drive?

As you know, some files cannot be compressed when your system is running. How do I enable compression system-wide then? For every single file? Can I enable it in the recovery console? Ps.: For ...
0
votes
1answer
439 views

Should I compress the harddisk file in a virtual machine?

I have a virtual machine with Windows 7 32-bit installed, and the host is Windows 7 64-bit. I have chosen dynamically resizeable VDI disk image. After installing Windows on the disk image, it is about ...
-1
votes
1answer
267 views

What 7zip settings to compress very large partition image?

I have 77 GB big partition backup image in single file and I'd like to compress it quickly. It should compress very well even on worst settings, but choosing GZIP with "Fastest" setting takes about ~1 ...
0
votes
1answer
313 views

Merging many .rar files in one .rar file

I have about 200GB of rar part files (all .rar) that I would like to merge into 1 single .rar file. I'm trying to perform this in Windows. How would one go about merging many a rar file without ...