Här kommer det roliga. PNG är ett mycket flexibelt format som kan innehåller mer än bara en rastererad bild. pngcheck ger denna output.
File: specto_work3.png (143876 bytes)
chunk IHDR at offset 0x0000c, length 13
280 x 240 image, 32-bit RGB+alpha, non-interlaced
chunk sBIT at offset 0x00025, length 4: red = 8 green = 8 blue = 8 alpha = 8
chunk pHYs at offset 0x00035, length 9: 2834x2834 pixels/meter (72 dpi)
chunk tEXt at offset 0x0004a, length 37, keyword: Software
chunk tEXt at offset 0x0007b, length 22, keyword: Creation Time
chunk prVW at offset 0x0009d, length 1757
Macromedia Fireworks preview chunk (private, ancillary, unsafe to copy)
chunk mkBF at offset 0x00786, length 72
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkTS at offset 0x007da, length 102430
unknown private, ancillary, unsafe-to-copy chunk
chunk mkBS at offset 0x19804, length 190
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x198ce, length 756
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x19bce, length 2741
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x1a68f, length 420
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x1a83f, length 560
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x1aa7b, length 3799
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x1b95e, length 1145
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x1bde3, length 339
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x1bf42, length 837
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x1c293, length 10775
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk mkBT at offset 0x1ecb6, length 671
Macromedia Fireworks private, ancillary, unsafe-to-copy chunk
chunk IDAT at offset 0x1ef61, length 8192
zlib: deflated, 32K window, default compression
chunk IDAT at offset 0x20f6d, length 8192
chunk IDAT at offset 0x22f79, length 631
chunk IEND at offset 0x231fc, length 0
No errors detected in specto_work3.png (46.5% compression).
Som ni ser finns det massor med chunks där som heter mkBT som mycket väl kan innehåll vector informationen. Hur man får ut den på rak arm kan jag inte säga just nu, men Fireworks borde ju kunna exportera till något annat format också.