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PNG Format

Hi,

We are trying to build a PNG Encoder. We have problems understanding how is the IDAT chunk built. We understand that the first 4 bytes are the length,the second 4 bytes are the IDAT signature, then raw data and of course 4 bytes of CRC at the end. Our problem is that the first 7 bytes in the data do not represent pixel indexing, but something else, and we can't figure out what. Any ideas what those bytes might represent?

Any help would be appreciated

Thank You,
Yuval

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