PNG (Portable Network Graphics)
PNG adalah format gambar lossless yang mendukung transparansi penuh (alpha channel), sehingga ideal untuk logo, ikon, tangkapan layar, dan grafik apa pun yang memerlukan tepi tajam atau latar belakang transparan. PNG tidak memperkenalkan artefak kompresi.
Tipe MIME
application/msword
Tipe
Biner
Kompresi
Lossless
Kelebihan
- + Universal compatibility with older Microsoft Office installations
- + Well-understood format with decades of tooling support
- + Supports macros, OLE objects, and VBA code
Kekurangan
- − Proprietary binary format is hard to parse without specialized libraries
- − Larger file sizes compared to ZIP-compressed DOCX
- − Macro-enabled DOC files are a common malware vector
Kapan Menggunakan .DOC
Gunakan PNG untuk grafik yang memerlukan transparansi, tangkapan layar, logo, dan gambar apa pun di mana kualitas lossless lebih penting daripada ukuran file.
Detail Teknis
PNG menggunakan kompresi DEFLATE (LZ77 + Huffman) yang diterapkan pada baris piksel yang difilter. Lima jenis filter per baris (None, Sub, Up, Average, Paeth) mengeksploitasi koherensi spasial sebelum kompresi. Kedalaman warna mendukung 1/2/4/8/16 bit per channel.
Riwayat
PNG dikembangkan pada tahun 1996 sebagai pengganti bebas paten untuk GIF setelah kontroversi paten LZW Unisys. Spesifikasinya menjadi rekomendasi W3C dan standar ISO pada tahun 2004.
Konversi dari .DOC
Konversi ke .DOC
Format Terkait
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