Category Archives: A

Auflösung

Was bedeutet eigentlich Auflösung in der Welt der digitalen Bilder? Nun, stell dir vor, jedes digitale Bild ist wie ein Mosaik aus winzigen Pixeln. Wir messen Auflösung in Pixeln pro Inch (PPI). Das bedeutet, wie viele Pixel es auf einem Zoll (etwa 2,54 cm) gibt. Wenn du also eine hohe Auflösung hast, gibt es viele Pixel pro Inch.

Aber Moment mal, Auflösung ist nur ein Teil des Bildqualitäts-Puzzles: Es ist wie ein Stück in einem großen Spiel. Es sagt dir nur, wie viele Pixel da sind, aber nicht, wie scharf diese Pixel sind. Stell dir vor, du hast zwei Bilder mit der gleichen Auflösung, aber eins ist super scharf, und das andere ist verschwommen. Da siehst du den Unterschied!

 

Nun, wie viel Auflösung brauchst du? Das hängt von dem ab, was du vorhast. Wenn du zum Beispiel eine winzige Briefmarke digitalisieren und dann auf einem riesigen Poster drucken möchtest, dann ist eine hohe Auflösung definitiv dein Freund.

 

Und hey, wenn du mehr Auflösung in deinem Leben möchtest,  könnte dich vielleicht die neue budgetfreundliche M150 interessieren! 😉

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Ambient light

Ambient light has a significant impact on the quality of scan results.

When installing scanning systems, the calibration or color profiling of the system is done in accordance with the existing ambient light. In order to guarantee a constant scan quality, the ambient light should not be subject to strong fluctuations.

Therefore, when placing the scan systems, make sure that they are located in a room that offers constant illumination and is not subject to strong light fluctuations or direct incidence of sunlight. Placement near a window or under ceiling lighting should be avoided if possible, as this can lead to disturbing reflections.

In addition, a slightly gray-tinted room color as well as a reflection-free housing, as offered by the new scanners of the book2net Black Line, can help to ensure the scanning quality.

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Interlock

Book cradle

Mechanical book cradles that are designed for a support angle of up to 180° usually also have a so-called book cradle lock. This works like a brake that prevents the book cradle from making compensating movements during the scan and thus prevents blurring. In addition, there is often also the option of locking the book cradle as a whole by hand or foot switch and using it only as a flat support table.

Glass plate

Professional scanning systems that work with glass plates also have the option of locking the open glass plate to enable scanning without pressure for particularly sensitive originals.

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Archive scanner

Why do archives need special scanners?

In addition to libraries and museums, archives are among the main custodians of movable cultural assets. In public ownership, they form the particularly sensitive cultural as well as the legal-administrative memory of a state, a municipality or a region. But also private archives, be it of companies, religious communities, political parties, clubs or family associations, can be of great social importance.

The information stored in archives and the associated information carriers are summarized under the term archive material. Archival records generally include documents that are no longer required by the relevant institutions, authorities, companies, organizations or private individuals for current tasks, but have been assessed as valuable for an indefinite storage. The information can be transmitted on different carriers: paper-based such as charters, documents, letters, sheet music, maps, plans, photos, electronically such as films and sound recordings, and increasingly also in digital form. Often there are also objects included such as seals or glass negatives.

What is specific to archives is that the information stored is mostly unique. Therefore, they are often subject to the protection of cultural property as part of the cultural heritage. Public archives generally work on the basis of archive laws, which define archiving and the associated fields of work as a public task. This includes the indexing, preservation of the holdings and the provision of archival materials for the community. In this context, the digitization of archival material has become increasingly important.

The complexity of archive material and the various fields of activity of archives require different systems for digitization and utilization.

Therefore, archive scanners such as our book2net Spirit A3 oder book2net Public A2 are the best solution for public areas. They offer quality, ease of use, robustness, durability and a protected operating system that cannot be manipulated.

On the other hand, archive scanners that accommodate the different formats, structures and requirements of archive material are required for digitization projects. For this purpose, we have specially developed the book2net archive scanner Archive Pro in close cooperation with our customers. This scanning system uniquely combines the qualities of a high-end book scanner with the advantages of a variable repro system, allowing the digitization of formats from A1+ to A5+ with a resolution of up to 1,200 dpi. Providing a height-adjustable camera slide, process-controlled automatic scanning and an accessible motorized support table, the system is extremely variable and user-friendly.

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Deskew – Alignment

To enable a quick and productive workflow, our Easy Scan software is equipped with an automatic alignment function (deskew). This means that originals do not need to be positioned exactly straight on the scan surface during scanning. This would take up an unnecessary amount of time and also block the system for other users for a longer time. The software recognizes the size and orientation of the template during the scanning process, automatically cuts out the original as a result and corrects the positioning at the same time. The result is a perfectly cropped and aligned image at the touch of a button.

The “Live Control Professional” software module offers even more convenience. This lets you see the cutting frame and alignment correction live in video mode even before the scan. So you already know the result before the actual scanning process.

 

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Apochromat / apochromatic

When light passes through an optical system (lenses made of glass), so-called “color errors” can occur. In this phenomenon, for example, white light is refracted into its components, which also explains the play of colors on glass edges when exposed to sunlight. A similar phenomenon is known from water surfaces, and rainbows are also basically based on this principle.

An apochromat (Greek for free of color, colorless) is an optical system, e.g. a lens, in which these color errors are largely corrected.

apochromatic image of a building

Comparison of an image with and without chromatic correction
Source: Wikimedia Commons (unchanged)
Copyright: Creative Commons Attribution-Share Alike 3.0 Unported.

Since such color errors should be avoided when digitizing, our systems work with a chromatic-corrected lens that compensates for this phenomenon. Otherwise, colored fragments would show around the edges of black letters, for example, and the scan would not be identical with the original.

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Autofocus

Autofocus is a common feature when taking photos with consumer cameras from providers such as Sony, Nikon, or Canon. Before the shutter is released, the focal length is automatically adjusted so that the subject is in focus. Although this function is very useful for private amateur photographers, it is not very helpful for professional digitization. Due to the frequent change of focus, the size of the image section does not remain constant either. This leads to image jumps when looking at the scans. In addition, the mechanics of such cameras are designed more for horizontal photography. Working overhead, such as with a repro system, makes working conditions difficult. With a daily number of several thousand scans, these consumer cameras wear out very quickly.

To minimize this wear and tear and to ensure a comfortable and productive workflow, we use a motorized focus that automatically focuses on defined positions while maintaining its settings. This gives our customers the advantage of quick focus adjustment without having to accept the disadvantages mentioned above.

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