This is the command pngchunks that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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
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