Then it puts all of that information together and provides not only very accurate color but unbelievable sharpness and detail. That means that each pixel is divided into four sections, and the sensor shifts four times during exposure to capture the RGB color channels-red, green, and blue-extremely accurately. I use a Hasselblad, a high-end four-shot camera. And those black and white discs (on the right) are called Spectralons, which can accurately tell us the value of the light by its reflectance value, which we can measure. The small chart (on the bottom), now all gray, will light up in color to indicate that a UV light is being shone on the painting. Using the exact color profile that we provide along with the color chart, they’ll know precisely if and what color adjustments are needed. Not to get too technical, but these charts are used both to calibrate the camera with a color profile and then for guidance down the road for someone who might just have the image file and not the work to compare it to. People often ask about the color charts (the grids of color, to the left of the painting in the shot above). The above image was shot with normal light, the kind I would use for publication-quality images, though I would adjust the lighting more and possibly use different polarizing filters.
View of Inventions of the Monsters on an easel and shot in normal light They want to see what is really going on-on and under the surface.Īs far as this Dalí painting goes, there are no real problems this suite of images was requested by conservation as part of an ongoing technical study on the artist, conducted in collaboration with the curators of the upcoming exhibition Salvador Dalí: The Image Disappears. They’re looking for problems like cracks or unstable paint, so they don’t need or want a pretty picture. Conservators will use these various images to help assess the condition of the painting. Today I’m capturing images of Dalí’s painting using six different kinds of light: normal, infrared, ultraviolet, axial, transmitted, and raking. The Art Institute is a little bit unique in that we’ve incorporated technical imaging here in our regular photography studio. Though I often do high-quality photographic captures for publication, my task today is technical imaging, which is done for conservation and science research.
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