PPMB Files
Portable Pixel Map (binary)

PPMB is a data directory which contains examples of the binary version of the PPM portable pixel map format. It is a simple RGB color image description. The definition is as follows:

• the typical file extension is ".ppm", but an extension of ".pnm" is also occasionally used.
• A "magic number" for identifying the file type. A binary PPMB file's magic number is the two characters "P6".
• Whitespace (blanks, TABs, CRs, LFs).
• A width, formatted as ASCII characters in decimal.
• Whitespace.
• A height, again in ASCII decimal.
• Whitespace.
• The maximum color-component value MAXVAL, again in ASCII decimal. For the binary format, MAXVAL cannot be any greater than 255.
• a single charcter of "whitespace", usually a new line.
• Width * height pixels, each pixel being described by 3 bytes, each between 0 and the specified maximum value, starting at the top-left corner of the pixmap, proceeding in normal English reading order. The three values for each pixel represent red, green, and blue, respectively; a value of 0 means that color is off, and the maximum value means that color is maxed out.

PPMB File Characteristics:

• binary
• RGB color
• 2D
• No compression
• 1 image

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

BMP_TO_PPMB, a C++ program which converts a Microsoft BMP file to a binary PPM file;

PBMB, a data directory which contains examples of binary PBM files, binary Portable Bit Map 2D graphics, black and white;

PGMB, a data directory which contains examples of binary PGM files, binary Portable Gray Map, 2D graphics;

PPMA, a data directory which contains examples of ASCII PPM files, Portable Pixel Map (ASCII) 2D graphics, color;

PPMA_TO_PPMB, a C++ program which converts an ASCII PPM file to a binary PPM file;

PPMB_IO, a C++ library which handles the binary PPM (Portable Pixel Map) format.

PPMB_TO_BMP, a C++ program which converts a binary PPM file to a Microsoft BMP file;

PPMB_TO_PPMA, a C++ program which converts a binary PPM file to an ASCII PPM file;

Reference:

1. the NETPBM homepage.

Sample Files:

• bell_206.ppm, a Bell 206 helicopter.
• bell_206.png, a PNG version.
• blackbuck.ppm, a picture of a buck.
• blackbuck.png, a PNG version.
• newton.ppm, an image of the basins of attraction of Newton's method for Z^3=1.
• newton.png, a PNG version.
• pbmlib.ppm.
• pbmlib.png, a PNG version.
• underwater_bmx.ppm, a slightly blurred image of a bicycle rider on a diving board.
• underwater_bmx.png, a PNG version.

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