Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your PDB images to PAM format. This tool works for both professionals and casual users. Convert your images to PAM in seconds.
Palm Database
The generic database container for Palm OS.
PDB (Palm Database) is the standard file format for all data on Palm OS devices, from address books to e-books. In the context of images, a PDB file acts as a container for 'Palm Pixmap' images, typically storing them as a series of records. It was the only way to get data onto a Palm pilot.
A PDB file consists of a header (name, attributes, creation time) and a list of records. For images, these records contain the bitmap data (often compressed with RLE/PackBits). ImageMagick treats PDB files as a multi-image sequence if multiple bitmaps are stored in the records. The format is strictly structured to map directly to the device's RAM storage model.
Created by Palm Computing in 1996. It was designed to facilitate 'HotSync' between the handheld's RAM and the desktop PC. It became ubiquitous in the early 2000s PDA era.
Portable Arbitrary Map
The 'universal' bitmap format of the Netpbm toolkit.
PAM (Portable Arbitrary Map) is the newest and most flexible member of the Netpbm format family (which includes PBM, PGM, and PPM). While earlier formats were strictly strictly black/white, grayscale, or RGB, PAM was designed to be generic. It can handle images with any number of channels, including transparency (alpha) channels, which the older formats lacked.
A PAM file starts with a text header defining width, height, maximum component value (depth), and 'TUPLTYPE' (describing what the channels mean, e.g., 'RGB_ALPHA' or 'CMYK'). The data follows as a raw binary stream of tuples. It unifies the parsing logic: instead of writing separate parsers for PBM/PGM/PPM, a program can just implement a PAM parser to handle everything.
Introduced with the Netpbm library updates to solve the 'Alpha Channel Problem'. The older formats (PPM) had no standard way to store transparency, leading to hacky non-standard extensions. PAM standardized this by allowing arbitrary tuple types.
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