Pngcrush is an optimizer for PNG (Portable Network Graphics) files.
It can be run from a commandline-interface.
Its main purpose is to reduce the size of the PNG IDAT datastream by
trying various compression levels an PNG filter methods. It also can
be used to remove unwanted ancillary chunks, or to add certain chunks
including gAMA, tRNS, iCCP, and textual chunks.
Installation
------------
Copy the file to usr:bin or C:
Usage
-----
pngcrush --help
pngcrush [options] infile.png outfile.png
pngcrush -e ext [other options] files.png ...
pngcrush -d dir [other options] files.png ...
Options
-------
-already already_crushed_size [e.g., 8192]
-bit_depth depth (bit_depth to use in output file)
-brute (use brute-force: try 126 different methods [11-136])
-c color_type of output file [0, 2, 4, or 6]
-d directory_name (where output files will go)
-double_gamma (used for fixing gamma in PhotoShop 5.0/5.02 files)
-e extension (used for creating output filename)
-f user_filter [0-5]
-fix (fix otherwise fatal conditions such as bad CRCs)
-force (write a new output file even if larger than input)
-g gamma (float or fixed*100000, e.g., 0.45455 or 45455)
-huffman (use only zlib strategy 2, Huffman-only)
-iccp length "Profile Name" iccp_file
-itxt b[efore_IDAT]|a[fter_IDAT] "keyword"
-keep chunk_name
-l zlib_compression_level [0-9]
-loco ("loco crush" truecolor PNGs)
-m method [0 through 200]
-max maximum_IDAT_size [default 8192]
-mng (write a new MNG, do not crush embedded PNGs)
-nofilecheck (do not check for infile.png == outfile.png)
-n (no save; does not do compression or write output PNG)
-plte_len n (truncate PLTE)
-q (quiet)
-reduce (do lossless color-type or bit-depth reduction)
-rem chunkname (or "alla" or "allb")
-replace_gamma gamma (float or fixed*100000) even if gAMA is present.
-res dpi
-rle (use only zlib strategy 3, RLE-only)
-save (keep all copy-unsafe chunks)
-srgb [0, 1, 2, or 3]
-ster [0 or 1]
-text b[efore_IDAT]|a[fter_IDAT] "keyword" "text"
-time_stamp
-trns_array n trns[0] trns[1] .. trns[n-1]
-trns index red green blue gray
-v (display more detailed information)
-version (display the pngcrush version)
-w compression_window_size [32, 16, 8, 4, 2, 1, 512]
-z zlib_strategy [0, 1, 2, or 3]
-zmem zlib_compression_mem_level [1-9, default 9]
-zitxt b[efore_IDAT]|a[fter_IDAT] "keyword"
-ztxt b[efore_IDAT]|a[fter_IDAT] "keyword" "text"
-h (help and legal notices)
-p (pause)
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