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Select the Degree of Compression

To select how much compression you want when adding files:

  1. Select Options from the Application Menu.
  2. Select the Compression category.
  3. Select a setting from the Compression drop-down menu list:

Setting

What It Does

Normal

Sets the level of compression to 5 on a scale of 0 - 9, where 0 is no compression. Provides a balance of compression and performance.

Speed

Sets the level of compression to 1 on a scale of 0 - 9: Favors performance over compression.

Fast

Sets the level of compression to 2 on a scale of 0 - 9: Gives more compression than Speed but still favors performance.

Maximum

Sets the level of compression to 9 on a scale of 0 - 9: Maximum compression.

Custom

Enables the Customize button. See below.


To select a compression algorithm and/or a custom level of compression:

  1. Choose Custom from the Compression drop-down menu to enable the Customize button.
  2. Choose Customize to open the Customize Compression dialog.
  3. Select a compression method from the drop-down menu.
    Deflate is the method PK Protect uses by default for ZIP and OpenPGP files. Other methods may offer greater speed but less compression, or vice versa. The degree of compression that any method can achieve depends greatly on the kind of data being compressed.

    Note: Other ZIP-format compression utilities may not be able to extract files compressed using methods other than Deflate.


    AlgorithmDescription

    Store

    Does not compress at all.

    Deflate

    The default compression method used for ZIP files.

    Deflate64

    A more powerful version of the Deflate method.

    DCL Implode

    The PKWARE Data Compression Library compression method: Lets you optimize for binary or ASCII files. Is typically faster than Deflate but provides less compression.

    BZIP2

    Typically provides more compression than Deflate but uses more memory and processing power and is slower.

    LZMA

    Often produces a higher compression ratio than Bzip2 but uses a lot of memory— as much as 16 MB— and takes more time than Deflate.

    PPMd

    Achieves especially good compression for natural language text but can use a lot of memory (~16 MB) and takes more time than Deflate.


  4. Position the slider on the scale between Minimum and Maximum to pick a level of compression. (The slider is not offered for every algorithm).

  5. If you picked the DCL Implode compression method, select a radio button: Binary or ASCII.
    DCL Implode enables you to optimize compression and performance for the type of file you are compressing: ASCII text or binary. If all the files you are adding are ASCII text files, select ASCII. No data is corrupted if you add ASCII text files when Binary is selected, or if you add binary files when ASCII is selected.

  6. Choose OK.
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