Lecture 8 - Mona lisa case study Flashcards
The Mona Lisa is a painting on a poplar wood panel. Previously cracked and repaired, the panel is placed in a frame and held by cross planks screwed into that frame The Mona Lisa is preserved in a transparent case and in 2005 the Louvre tried to find the best preservation conditions
What is the definition on Psychometrics? (AKA psychometry or hygrometry)
The determination of physical and thermodynamic properties of gas-vapor mixtures (the study of humidity/dewpoint)
How were hygromechanical effects on the Mona Lisa studied?
Several measurements were taken of the painting during the day and comparisons were made
How was the effect of the frame upon the Mona Lisa painting determined?
Measurements of the relief were taken with the frame and without the frame
Projection Moire (PM) and Shadow Moire (SM) were the optical techniques considered in the study of the Mona Lisa What are some relevant qualities of Projection Moire
Advantages - Simple set up Disadvantages - Calibration; Relief not directly visible Grid - Projected images; Large pitch p Uncertainty - Function of p RMS - 0.05 to 0.12
Projection Moire (PM) and Shadow Moire (SM) were the optical techniques considered in the study of the Mona Lisa What are some relevant qualities of Shadow Moire
Advantages - Relief directly visible Disadvantages - Large master grid Grid - Close to object; small pitch p Uncertainty - Function of p RMS - 0.03 (4x more accurate than PM)
Projection Moire (PM) and Shadow Moire (SM) were the optical techniques considered in the study of the Mona Lisa - what are the relevant things to consider when deciding between PM and SM
Shadow Moire chosen
How was the Experiment set up?
CCD Camera & PC -> Light source -> Glass case -> Mona Lisa and grid Spatial resolution – 0.86 mm/pixel, 600x900 pixels (516x774 mm) Recorded image: Front face – relief uncertainty – 5/100mm
What were the effects of the frame on the painting
