Making the invisible visible
Multispectral Digitisation with CHARISMA
In the course of a digitisation project, the question often arises as to whether we don’t want to go beyond what is obvious when digitizing analog materials. Why limit yourself only to the visible?
The aim of most digitisation measures is to largely reduce later access to the original and, in addition, to learn as much as possible about the origin and history of the object. This leads us from classic methods of digitization in the optically visible spectrum to digitization with the help of multispectral photography.
The visible part of the electromagnetic spectrum with wavelengths of around 400 to 700 nm – generally referred to as light – is used for the classic imaging processes. Here, however, we only move on the surface of an object. In order to enable scientific investigations, however, phenomena below the surface and simply undetectable features are also important.
Digitisation with CHARISMA
With narrow-band light sources, finely tuned filter systems and a camera system with the ability to focus outside of visible light, an automatically congruently aligned image stack is created in a defined and reproducible workflow, which allows the analysis, e.g. B. of paintings on a qualitatively new level. The image stack contains all images as described in the CHARISMA standard.
In addition, it is also possible, e.g. to generate X-rays or to include historical recordings.
Let us advise you on how you can use this procedure for your analysis and documentation procedures.
These series of captures per object form the basis for the detection of e.g. B. damage the surface, on the varnish as well as retouching, overpainting, various combinations of pigment and binder or the preliminary drawing.
An improvement in readability is possible, e.g. an aged ink as well as possibly an old, barely recognizable wall painting. Significantly younger templates can also benefit from this procedure, e.g. B. Thermocopies or hectographs fade over time and are difficult or impossible to read.
In the course of an upcoming project, a test series is recommended to determine the possibilities for the respective template types and finally the creation of the desired image stack in the course of a series digitization.
- Examination of paintings
- Recognize fonts on old, faded or painted over documents
- Investigations of wall painting
- Resolution up to 151 megapixels per image (14204 x 10652 pixels / > DIN A0 at 300ppi)
- LED-based lighting systems with a special, automated filter system
- Mobile and transportable system for digitisation work on site
- Particularly suitable for series of objects with always the same capture conditions
- complete blackout must be possible
- Suitable for object sizes of up to approx. 3m² per stack (stitching is also possible)
- deal for two-dimensional templates in the reflected light process
- Image stack according to the Charisma Standard
- Reproducible procedure
- Individual implementation in consultation with restorers