mBoosterPng User Guide

 

mBoosterPng is a PNG optimizer minimizing the size of PNG files by compressing the IDAT chunks with Innaworks' mBoosterZip deflate algorithm. mBoosterPng is complementary with other PNG optimizers such as optiPng (http://optipng.sourceforge.net/) and advPNG (http://advancemame.sourceforge.net). mBoosterPng is integrated into mBooster, but is also available as a standalone command-line program. This section describes the behavior of the standalone command-line version of mBoosterPng.

mBoosterPng takes a set of input PNG files and recompresses them, creating a file in the output directory for each recompressed PNG file.

Note: mBoosterPng Evaluation Version does not generate any output PNG files, but instead can only display the sizes of the PNG files produced.

 

Usage Syntax

mBoosterPng [[-<option>[ value]]...] <outputDir> <input...>

File arguments:

<outputDir>	The directory to output PNG files to, preserving the directory structure of the input. If it does not exist, it will be created.
<input...>	A list of input file names and/or input directories. Any files matching the PNG file format regardless of extension will be recompressed.

Options:

-r	Recurse into subdirectories. This has no effect if <input...> does not contain directories.
-max_idat_data_size <value>	This property defines the maximum size of compressed data in each IDAT chunk in the recompressed PNG. The default is 0, no limit.
-keep_all_chunks	Keep all chunks within the input PNG files. By default this is off, so we only keep the compulsory chunks, and the tRNS (transparency) chunk.
-no_compress	Compress data chunks into store mode, i.e. with no compression. By default this is off, for the normal case we compress data chunks as much as possible.

Note:
If the full pathname of a file or directory is not supplied, it is assumed to be a file or subdirectory directly under the current working directory.

 

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