Category Archives: J

JIS B series

The Japanese standard JIS P 0138-61 adopts the A and C series of ISO and DIN, respectively, but defines a slightly different B series: JIS B0 has an area of 1.5 m², the arithmetic and non-geometric mean of the areas of A0 and 2A0, widths and heights are determined analogously to A and rounded accordingly.

The origin of the Japanese B series lies in the fact that this format was intended to be compatible with the already used Shiroku-ban with its dimensions of 127 × 188 mm, which in turn had its origin in the officially used Mino-ban format of the Edo period. The Shiroku-ban thus became almost identical to the new JIS B6.

JPEG 2000, JP2

JPEG 2000 is a file compression format that uses codes to create better compression performance and highly improved image quality. The coding system uses an area of interest approach that enables the saving of parts of images of different quality. Saving files in JPEG 2000 standard allows the user to choose between using compression or saving files in lossless to retain the original details. Thus, creating a much better alternative solution than its predecessor JPEG file format.

Its common applications include scanners, military surveillance, medical imagery, digital audiovisual contents, and imagery for long-term digital preservation. Book2net Easy Scan Professional Capture Software supports JPEG 2000.

JPEG

JPEG is a lossy compression format developed by the Joint Photographic Experts Group in 1986. During image compression, JPEG compares every 8 by 8 blocks of pixels that make up the images to a linear combination of 64 standard patterns. Thereafter, it establishes the weight of each of these 64 patterns that contribute to 8 by 8 blocks of pixels. Some of the data are lost in the process thus smaller file size. The desired trade-off between file sizes and visual quality can be achieved by adjusting the degree of compression.

JPEG format is widely applied in various digital cameras and scanning devices such as book2net scanners. Images saved in JPEG are suitable for editing thanks to high resolution and low compression. Despite the advantages, JPEG images are saved in one layer and there isn’t an opportunity to redo them.

 

JHOVE

JSTOR/Havard Object Validation Environment (JHOVE) is software used for format identification, validation, and characterization of digital images during post scanning tasks.Whereas the validation process establishes the level of compliance of the digital image to the specifications of its purported formats. It checks the well-formedness, validity, and consistency of digital objects. Format characterization determines the salient features of a given object. JHOVE uses standards established by Open Archival Information System (OAIS) reference model ISO/IEC 14721 to report information such as digital image file path/URL, last modification date, byte size, format, format version, MIME types./span>

To conclude, the JHOVE tool supports routine identification, validation, and characterization of digital images stored in digital repositories.