BMP (format fișier)

Formatul de fișier BMP (en. Bitmap - hartă de biți), cunoscut de asemenea și ca fișier imagine Bitmap sau formatul de fișier DIB (en. Device Independent Bitmap - „bitmap” independent de dispozitiv) sau pur și simplu Bitmap, este un format de fișier imagine de tip rastru folosit pentru a stoca imagini digitale independent de dispozitivul de afișare (cum ar fi un adaptor grafic) în special pe sistemele de operare Microsoft Windows și OS/2.

Formatul de fișier BMP este capabil de a stoca imagini digitale bidimensionale de lățime, înălțime și rezoluție arbitrare, monocrome sau color, de variate profunzimi ale culorii iar opțional cu comprimare de date, canale alfa și profile de culoare.

Antet

Secvențele posibile ce identifică formatul BMP sunt:

Ofset # Dimensiune (octet) Valoare (hex) Descriere
0 2 42 4D[1] Primii doi octeți identifică formatul fișierului
2 4 00 00 – FF FF Dimensiunea imaginii desenate pe doi octeți.
6 2 Rezervați Rezervați. Octeți completați de aplicația software.
8 2 Rezervați Rezervați. A doua serie extinsă de octeți completată de aplicația software.
10 4 00 00 00 0A – FF FF FF FF Începutul datelor propriu-zise (raw), unde se stochează imaginea.
0Ax 1 00x – FFx Primul octet.
0Ax + 1 1 00x – FFx Al doilea octet.
EOF − 1 1 00x – FFx Ultimul octet.

Declararea unei matrice de date tip BMP în C++

C++ #
|-
 #include <stdint.h>
 struct bmpfile_magic {  unsigned char magic[2]};
 struct bmpfile_header {
  uint32_t filesz;
  uint16_t creator1;
  uint16_t creator2;
  uint32_t bmp_offset;};

Referințe

  1. ^ en „File Extension Seeker”. Ianuarie 2011.  Verificați datele pentru: |date= (ajutor)

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