The KU Leuven University Archives requested a digital reproduction of a porcelain card. A porcelain card is a 19th century lithographic printing technique that uses either white lead or kaolin to produce prints with a very distinct shimmer (more information here). Because this shimmer is an essential aspect of the porcelain card, we somehow had to preserve some of the shine in our reproduction. Since common digitization techniques are obviously tailored to minimize the amount of reflection, this turned out to be quite a challenge. Continue reading
iQ-Analyzer report, ColorChecker SG – own measurements
In a previous post we discussed the use of the X-Rite ColorChecker SG card and the online platform delt.ae as a means to control and validate the colour accuracy of our digitisation workflows. Whilst that process allows for a quick colour management, we found it to be somewhat insufficient in those cases where we want to take the quality of our captures to the next level. Continue reading
KU Leuven, Maurits Sabbe Library, Bible of Anjou, Naples, 1340, fol. 208r, detail, King Robert of Anjou, King of Naples, receives a book from a scribe, right the added heraldic emblem of one of the first owners of the Bible, Nicollo d’Alifio.
Apart from the digitisation of the documentary heritage of the University Library, the Imaging Lab is also the home of various projects on art-technical imaging. These projects are developed in close cooperation with researchers. A fine example is the RICH project (Reflectance Imaging for Cultural Heritage). Continue reading
Before, during and after digitisation of books, manuscripts and objects, we use various targets as a reference for color correction, color calibration and control of the final output.
The target we use for general color calibration is the X-Rite ColorChecker SG card with 140 different color patches. Continue reading
At the Imaging Lab we are currently working on our calibration workflow in order to achieve the Metamorfoze Imaging standard. Working with calibration targets is nothing new, but while scrolling through the images of the Project Apollo Archive we were surprised to find a few images of targets (black and white and color).