Display Filter Reference: Portable Network Graphics
Protocol field name: png
Versions: 1.0.0 to 2.6.5
Back to Display Filter Reference
| Field name | Description | Type | Versions |
|---|---|---|---|
| png.bkgd.blue | Blue | Unsigned integer, 2 bytes | 1.0.0 to 2.6.5 |
| png.bkgd.green | Green | Unsigned integer, 2 bytes | 1.0.0 to 2.6.5 |
| png.bkgd.greyscale | Greyscale | Unsigned integer, 2 bytes | 1.0.0 to 2.6.5 |
| png.bkgd.palette_index | Palette Index | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.bkgd.red | Red | Unsigned integer, 2 bytes | 1.0.0 to 2.6.5 |
| png.chrm.blue.x | Blue X | Floating point (single-precision) | 1.12.0 to 2.6.5 |
| png.chrm.blue.y | Blue Y | Floating point (single-precision) | 1.12.0 to 2.6.5 |
| png.chrm.green.x | Green X | Floating point (single-precision) | 1.12.0 to 2.6.5 |
| png.chrm.green.y | Green Y | Floating point (single-precision) | 1.12.0 to 2.6.5 |
| png.chrm.red.x | Red X | Floating point (single-precision) | 1.12.0 to 2.6.5 |
| png.chrm.red.y | Red Y | Floating point (single-precision) | 1.12.0 to 2.6.5 |
| png.chrm.white.x | White X | Floating point (single-precision) | 1.12.0 to 2.6.5 |
| png.chrm.white.y | White Y | Floating point (single-precision) | 1.12.0 to 2.6.5 |
| png.chunk.crc | CRC | Unsigned integer, 4 bytes | 1.0.0 to 2.6.5 |
| png.chunk.data | Data | Label | 1.0.0 to 2.6.5 |
| png.chunk.flag.ancillary | Ancillary | Boolean | 1.0.0 to 2.6.5 |
| png.chunk.flag.private | Private | Boolean | 1.0.0 to 2.6.5 |
| png.chunk.flag.stc | Safe To Copy | Boolean | 1.0.0 to 2.6.5 |
| png.chunk.len | Len | Unsigned integer, 4 bytes | 1.0.0 to 2.6.5 |
| png.chunk.type | Chunk | Character string | 1.0.0 to 2.6.5 |
| png.chunk_too_large | chunk size too large, dissection of this chunk is not supported | Label | 1.12.0 to 2.6.5 |
| png.gama.gamma | Gamma | Floating point (single-precision) | 1.12.0 to 2.6.5 |
| png.ihdr.bitdepth | Bit Depth | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.ihdr.colour_type | Colour Type | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.ihdr.compression_method | Compression Method | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.ihdr.filter_method | Filter Method | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.ihdr.height | Height | Unsigned integer, 4 bytes | 1.0.0 to 2.6.5 |
| png.ihdr.interlace_method | Interlace Method | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.ihdr.width | Width | Unsigned integer, 4 bytes | 1.0.0 to 2.6.5 |
| png.phys.horiz | Horizontal pixels per unit | Unsigned integer, 4 bytes | 1.0.0 to 2.6.5 |
| png.phys.unit | Unit | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.phys.vert | Vertical pixels per unit | Unsigned integer, 4 bytes | 1.0.0 to 2.6.5 |
| png.signature | PNG Signature | Sequence of bytes | 1.0.0 to 2.6.5 |
| png.srgb.intent | Intent | Unsigned integer, 1 byte | 1.12.0 to 2.6.5 |
| png.text.keyword | Keyword | Character string | 1.0.0 to 2.6.5 |
| png.text.string | String | Character string | 1.0.0 to 2.6.5 |
| png.time.day | Day | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.time.hour | Hour | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.time.minute | Minute | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.time.month | Month | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.time.second | Second | Unsigned integer, 1 byte | 1.0.0 to 2.6.5 |
| png.time.year | Year | Unsigned integer, 2 bytes | 1.0.0 to 2.6.5 |
Go Beyond with Riverbed Technology
I have a lot of traffic...
ANSWER: SteelCentral™ Packet Analyzer PE
- • Visually rich, powerful LAN analyzer
- • Quickly access very large pcap files
- • Professional, customizable reports
- • Advanced triggers and alerts
No, really, I have a LOT of traffic…
ANSWER: SteelCentral™ AppResponse 11
- • Full stack analysis – from packets to pages
- • Rich performance metrics & pre-defined insights for fast problem identification/resolution
- • Modular, flexible solution for deeply-analyzing network & application performance