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PNG File Format/Image Data

ν˜„μž¬λŠ” compression method 0만 있음. zlib의 inflate, deflate와 κ°™λ‹€. μ΅œλŒ€ μœˆλ„μš° μ‚¬μ΄μ¦ˆλŠ” 32768λ°”μ΄νŠΈ

Inflate

Deflate

  • zip, gzip, pkzip μ—μ„œ μ‚¬μš©ν•˜λŠ” LZ777 νŒŒμƒ κΈ°λ²•μ‚¬μš©.
  • zlib으둜 μ••μΆ•λœ PNG 의 이λΈμ§€μ˜ λ°μ΄ν„°λŠ” λ‹€μŒμ˜ 포맷
    • Compression method/flags code : 1 byte
    • Additional flags/check bits : 1byte
    • Compressed data blocks : n bytes
    • Check value : 4 bytes

μ••μΆ• ν’€λ¦° 데이터

  • μ••μΆ•ν’€λ¦° λ°μ΄ν„°λŠ” 각 μŠ€μΊ”λΌμΈλ³„λ‘œ λ‹€λ₯Έ ν•„ν„°λ‘œ λ˜μ–΄μžˆλ‹€. 즉 ν•œ μŠ€μΊ”λΌμΈμ€ ν”½μ…€widthλ°”μ΄νŠΈ +1byte 이며 이 1 λ°”μ΄νŠΈλŠ” 각 μŠ€μΊ”λΌμΈμ˜ μ•žλΆ€λΆ„μ— μ˜¨λ‹€.

    {filter type} RGB, RGB, RGB,,,,, μ΄λŸ°μ‹
      
  • μžμ„Έν•œ λ‚΄μš©μ€ PNGFileFotmat/FilterAlgorithms μ°Έμ‘°.

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