Category Archives: G

Gray chart

A gray chart is used to measure the dynamic range or tonal value differentiation of a digital camera, scanner or monitor. It is a test chart in which there is a smooth or multi-graded (gray scale chart) transition between dark black and bright white.

Glass plate

In order to ensure a true-to-scale, distortion-free high-quality image when digitizing bound originals, one of the requirements is that the surface of the original must be absolutely flat. For this reason, many professional scanning systems work with additional glass or Makrolon© plate pressure systems.©.

In addition, to guarantee that books of different thicknesses and states of preservation can also be scanned gently and efficiently using glass plates, professional systems operate with advanced adjustment systems for the glass plate allowing the pressure and travel paths to be set precisely and individually as required.

This is used in particular with high-performance scanners with semi-robotics such as the book2net Cobra, Flash, Mosquito, Hornet and Dragon.

Professional book scanners also offer special non-reflective glass with UV protection (museum glass) to minimize light exposure, especially for valuable originals such as incunabula and manuscripts.

German Federal Document Safeguarding Project

The destruction of culturally and historically significant documents through armed conflicts or natural disasters means irreparable damage to cultural memory. Valuable archive and written material are therefore particularly in need of protection. The amount of archival material and their random locations, however, generally does not allow a significant amount of outsourcing in the event of catastrophes or hazardous situations, as the protected spaces required for this are hardly available. For this reason, the Federal Republic of Germany began in 1961, in accordance with the Hague Convention for the Protection of Cultural Property, to microfilm its valuable archives for security purposes and to store them at central shelter so that they can replace the original documents in the event of irretrievable loss. The microfilming is carried out on behalf of the Federation under the leadership of the Federal Office of Civil Protection and Disaster Assistance (BBK). The archive material is security-filmed on microfilm in accordance with selection criteria defined by the Federal Government and in compliance with specified technical standards.

As part of the conversion of the microfilming devices to digital technology, which was agreed between the Federal Office for Civil Protection and Disaster Assistance (BBK) and the Conference of Heads of the Federal and State Archives Administrations (KLA), tenders for high-performance archive scanners have recently been issued to carry out this major task. We are pleased that several of the central state archives have already decided to purchase our new archive scanner book2net Archive Pro to support this project.


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Graphics Interchange Format, GIF, is a bitmap image file format that supports up to 8 bits per pixel for each image thus allowing single images to reference their own color chosen from the 24-bit RGB color space. GIF file format uses a lossless data compression technique to reduce file size without degrading the visual quality. This enables files to be converted to a different file type without loss of quality. As much as GIF supports animations, it is less suitable for reproducing color photographs and images with color gradients.