pngchunks(1) [debian man page]
PNGCHUNKS(1) General Commands Manual PNGCHUNKS(1) NAME
pngchunks - print information embedded into a PNG file SYNOPSIS
pngchunks file DESCRIPTION
pngchunks is a program that displays informations from files created according to the Portable Network Graphics file format. EXAMPLE
pngchunks input.png Chunk: Data Length 13 (max 2147483647), Type 1380206665 [IHDR] Critical, public, PNG 1.2 compliant, unsafe to copy IHDR Width: 256 IHDR Height: 256 IHDR Bitdepth: 8 IHDR Colortype: 2 IHDR Compression: 0 IHDR Filter: 0 IHDR Interlace: 0 IHDR Compression algorithm is Deflate IHDR Filter method is type zero (None, Sub, Up, Average, Paeth) IHDR Interlacing is disabled Chunk CRC: -753909967 Chunk: Data Length 6 (max 2147483647), Type 1145523042 [bKGD] Ancillary, public, PNG 1.2 compliant, unsafe to copy ... Unknown chunk type Chunk CRC: 554438993 Chunk: Data Length 9 (max 2147483647), Type 1935231088 [pHYs] Ancillary, public, PNG 1.2 compliant, safe to copy ... Unknown chunk type Chunk CRC: -757235972 Chunk: Data Length 7 (max 2147483647), Type 1162692980 [tIME] Ancillary, public, PNG 1.2 compliant, unsafe to copy ... Unknown chunk type Chunk CRC: 429243611 Chunk: Data Length 831 (max 2147483647), Type 1413563465 [IDAT] Critical, public, PNG 1.2 compliant, unsafe to copy IDAT contains image data Chunk CRC: 1406256926 Chunk: Data Length 0 (max 2147483647), Type 1145980233 [IEND] Critical, public, PNG 1.2 compliant, unsafe to copy IEND contains no data Chunk CRC: -1371381630 SEE ALSO
pngchunkdesc(1), pngcp(1), pnginfo(1). AUTHOR
pngchunks was written by Michael Still <mikal@stillhq.com>. This manual page was written by Nelson A. de Oliveira <naoliv@debian.org>, for the Debian project (but may be used by others). Tue, 31 Jul 2007 17:55:51 -0300 PNGCHUNKS(1)
Check Out this Related Man Page
img-png(n) img-png(n) NAME
img-png - Img, Portable Network Graphics format (png) SYNOPSIS
package require Tk package require img::png ?1.3? image create photo ?name? ?options? DESCRIPTION
The package img::png is a sub-package of Img. It can be loaded as a part of the complete Img support, via package require Img, or on its own, via package require img::png. Like all packages of Img it does not provide new commands, but extends the existing Tk command image so that it supports files containing raster images in the Portable Network Graphics format (png). More specifically img::png extends Tk's photo image type. The name of the new format handler is png. This handler provides new additional configuration options. See section PNG OPTIONS for more detailed explanations. All of the above means that in a call like image create photo ?name? ?options? [1] Image data in png format (options -data and -file) is detected automatically. [2] The format name png is recognized by the option -format. In addition the value for the option is treated as list and may contain any of the special options listed in section PNG OPTIONS. PNG OPTIONS
The handler provides no true options at all, but accepts pairs of keys and values when writing a PNG file. Each pair will be written as a named text chunk where the key provides the name of the chunk and the value its contents. For example png Author <name> Title <title> Description ... TRANSPARENCY
If you want to write images to disk which contain transparency information (e.g. PNG with alpha channel) you need at least Tk 8.3. SEE ALSO
img-bmp, img-gif, img-ico, img-intro, img-jpeg, img-pcx, img-pixmap, img-png, img-ppm, img-ps, img-sgi, img-sun, img-tga, img-tiff, img- window, img-xbm, img-xpm KEYWORDS
image handling, png, tk COPYRIGHT
Copyright (c) 1995-2003 Jan Nijtmans <nijtmans@users.sourceforge.com> Img 1.3 img-png(n)