Let N be the length in bits of the compressed version of F. There are 2 N such files. That file cannot be decompressed reliably which of the two originals should that yield? We must therefore conclude that our original hypothesis that the compression function makes no file longer is necessarily untrue. Synetech : You are absolutely right, that was a language trap. I didn't meant any , but arbitary file in the meaning of random data.
Ah okay, I see. Yes, a file containing random bytes is just terrible for compression. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science. Featured on Meta.
New post summary designs on greatest hits now, everywhere else eventually. Linked 3. Related However, if you would like a more efficient way to shrink certain files, you should get a different tool.
Most of these ZIP alternatives have similar compressing options. A new window will open with various options. There are tools with some additional features. By compressing your folders to some of these archive formats using the appropriate features, you can shrink large files to up to one-fourth or even one-fifth of their uncompressed size. You can use the same tools to separate a single ZIP archive into a bunch of smaller archives. Post as a guest Name.
Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Related 3. Hot Network Questions. I have several large image files from my digital camera. I could send many emails, each with one image attached. In the past, I have been able to zip these files together and attach them to one email because the zipped file is smaller than the originals.
Why doesn't zipping these full size image files together, give me a file which is smaller than the total of the separate files? I thought that one of the benefits of zipping files, was to make it easier to send them. The person at the other end can unzip them and have the full size original files.
Jun 11, PM. Allan, thanks. I understand now. My memory must be poor. I was probably zipping either Word documents, or pdf files. These files will be either in jpeg or a Raw format. Since they are already compressed, one option is to use something like Dropbox or send them one file at a time as an attachment. Your description of what a compressed file is, comes across clearly.
0コメント