Python script to resize all images inside a CBZ (Comic Book Zip).
This fork comes with some additions and defaults to better suit my iRiver Story HD.

The iRiver Story HD has a resolution of 768x1024. It does not allow for the landscape images (full spread of a book or magazine) in a CBZ to be rotated dynamically. (It will split the image in two pages, screwing with the page order if you read a comic printed from right to left.) This addition lets you rotate the landscape pages either left (ccw) or right (cw).

1. Usage
2. Install and Dependencies
3. Configuration
4. FAQ

resizecbz [-w resolution] [-r rotation] [-d directory] [-e extension] [-u] [file ...]

file can contain wildcards such as *.cbz, abc?.cbz, etc.
For example: resizecbz collection1/*.cbz collection2/xyz*.cbz

Any error will be logged into the file resizecbz.error.log

-w, --resolution in the form of 768x1024, 1024x768 or 1024 (providing only one value will set both horizontal and vertical maximum resolution to that value, use with readers capable of rotating images)
-r, --rotation valid options are right, left or none (anything else than right or left translates to none, defaults to right)
-d, --directory name of the directory to put the resized CBZ files in
-e, --extension this string will be added to the filename before the CBZ extension
-u, --unsafe do not check the file extension, use if your CBZ files are not ending in CBZ or ZIP

The script requires python 3+ and the pillow module.

brew install python
python pip install pillow

I prefer put it somewhere in $PATH so I can invoke it as an ordinary command wherever.
On macOS and BSD you can use install(1) to put it under /usr/local/bin/ or similar.

sudo install -m 755 -o $USER -g bin resizecbz.py /usr/local/bin/resizecbz

You can control the maximum size of the images, the destination directory, and the extesion of the resized file via a configuration file. A sample configuration file resizecbz.cfg.sample will be created the first time you run the script without any parameters. You can edit this file and then rename it to resizecbz.cfg and it will be loaded by the script. You can put resizecbz.cfg in the directory where you run the script (so you can have a different resize parameters for each directory), the same directory as the script, in your home directory, or in ~/config/resizecbz.

By default the maximum width in landscape mode is 768, and the maximum height in portrait mode is 1024, the directory is a subdirectory resized underneath the source directory, and the default extension is rs.cbz.

The program will only attempt to resize images in files that have the extension zip or cbz. All other files will be ignore. If you have a zip file with an extension other than zip or cbz then you have to either rename the file to have the right extension, or edit the config file and set ext_zip_or_cbz = 0. But if you do that then you have to ensure that you only specify files that are actually zip files, else many errors will be generated when the script attemp to open files as a zip when you specify a general wildcard like *.*

Mostly minor details due to personal preference.

• rotate_landscape = orientation valid orientations are right, left and none.
• removed the leading period in the config file name
• removed the txt extension on the log file
• adjusted default resolution to 768x1024 (iRiver Story HD)
• set default rotation to right (90° clockwise)
• added shebang to make script executable (I prefer to put it somewhere in $PATH)
• added flags to change settings at runtime (flags always override config file)