-A--Averaging
Compute "average" representatives for shapes matching a pattern.
-an--aggressionn
Sets aggression for pattern matching. The more the aggression, the less the file size, but the
more likely substitution errors will occur. The default is 100. Usually you can raise it to about
110 more or less safely. Probably even 200 will work fine, but don't rely on that.
Consistent aggression levels between versions is not guaranteed. The default, however, will
always be 100.
This option turns on --match automatically.
-c--clean
Remove small black marks that are probably noise. This algorithm can really devastate halftone
patterns, so use with caution.
This option is turned on by --lossy.
-dn--dpin
Specify the resolution of an image, measured in dots per inch. The resolution affects some
algorithms and it's recorded in DjVu and BMP files (TIFF should join someday).
-e--erosion
Sacrifice image quality to gain about 5-10% in file size. One erosion is almost invisible, but 10
erosions in a row spoil an image badly (and they won't give you 50-100% of file size, alas).
Erosion bonus stacks with pattern matching.
Erosion makes no sense when the output is not DjVu.
This option is turned on by --lossy.
-i--indirect
Specifying this option in multipage mode causes minidjvu to generate an indirect multipage
document, consisting from a single index file, several single-page DjVu files (one per each image
passed to the encoder) and several shared dictionary files. Note that the index file is created
under the name specified for the output file in the command line, while for each page the original
input file name is preserved, with the extension being changed to ".djvu".
This mode is useful for placing a large document to a Web server, or if you are going to
postprocess the generated files (e. g. by adding a color background). In the later case you may
then want to convert your indirect document to DjVu bundled, using the djvmcvt utility, supplied
with DjVuLibre.
-l--lossy
Turn on all lossy options. Is equivalent to --clean--erosion--match--smooth.-m--match
Run pattern matching. This is the main method of shrinking the file size, but it can also bring
trouble with substitution errors. Use --aggression option to maintain balance between file size
and error probability.
This option is turned on by --lossy or --aggression.
-n--no-prototypes
Disable prototype searching. This makes lossless compression faster, but produced files become
much bigger.
-p--pages-per-dict
Specify how many pages to compress in one pass. The default is 10. If -p0 is specified, minidjvu
will attempt to process all pages at once, but be aware that this can take a lot of memory,
especially on large books.
-r--report
Print verbose messages about what's done on which page. Works only with multipage encoding.
Useful only to survive boredom while compressing a book.
-s--smooth
Flip some pixels that appear to be noise. The gain in file size is about 5%. Visually the image
is slightly improved, but it's hardly noticeable.
Current filter is dumb and only removes black pixels with at least 3 white neighbors (of 4). You
probably won't notice the effects.
This option is turned on by --lossy.
-v--verbose
Print messages about various stages of the process. It's not very useful, but interesting to
examine.
-X--Xtension
Specifies an extension for shared dictionary files (without a leading period). The default is
"iff".
-w--warnings
Do not disable libtiff warnings. By default, TIFF warnings are suppressed. Under Windows default
TIFF warning handler creates a message box. This is unacceptable in a batch processing script,
for instance. So the minidjvu default behavior is a workaround for libtiff default behavior.
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