Windows Explorer, among many other tools, allows you to add custom
information (e.g. author, title, keywords and comments) to your
photos.
For example, to add an Author tag to your photo, just
right click it in Windows Explorer, then select "Properties" from
the shortcut menu. In the shown dialog, select tab "Summary", then
click entry "Author" and enter your name. See below (screenshot
from Windows XP):
Note that these information are stored in photos as Exif
metadata. Microsoft
Pro Photo Tools is another nice utility for you to read and
modify these values.
In BatchBlitz, you can view these custom information in the "Image
Properties" dialog.
At times, you may want to organize or search your photos
according to these information.
For example, you may find it necessary to categorize your photos
by their authors, or you may want to find out all photos tagged
with a keyword "flower".
Now BatchBlitz comes to your help!
In BatchBlitz, the Categorize Images Wizard enables you
to organize or search your photos by, among others, custom data
like author, keywords, etc.
In the below section, you'll learn how to categorize your photos
by custom data Author. The categorization result may look
something like:
As shown above, folder "David
Lee" now contains all photos shot by photographer
David Lee. The special folder
"_Unknown" contains all photos from
which the Author metadata cannot be retrieved (e.g. because
this metadata field hasn't been set yet, or because the files
contain no Exif info at all).
Suppose you already have multiple photos selected into the
Source Images list, as shown below.
These files should contain custom data set by Windows Explorer or
any other tool.
Now you can click button 
on
the toolbar to start the Categorize Images
Wizard. Note that this button is disabled when Source Images list is empty.
In the shown Categorize Images
Wizard, follow the below steps:
Step 1: Select a metadata field.
Please select "Exif -
Author" from the "Categorize images
by" dropdown list. As shown below:
Click Next to proceed.
Step 2: Select an output folder.
This folder is for storing the categorized photos. Original
files remain intact unless you check the option "Delete original files after categorization".
See below:
Click Next to proceed. This will start the categorization
process.
Step 3: Wait for the process to complete.
When categorization is completed, you can click Finish to quit
the wizard.
Besides the above-mentioned custom data, Categorize Images
Wizard can also categorize photos by other Exif and IPTC
metadata.
A tutorial on this topic can be found here.
See BatchBlitz online documentation for more information.
