You can do length measurements directly on the digital photograph of the Sudarium of Oviedo shown below
(copyrighted Centro Español de Sindonología, kindly provided by Mark Guscin). Its calibration is 1px = 1.12mm.
This is based on the size of 84x53cm of the Sudarium.
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On the right, the current coordinates is displayed as you move the pointer mouse over the image. It also gives the length in millimeters from the last selected point. When you click on the image, new coordinates are selected and a length is calculated from the previous coordinates.
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Unknown coordinates until you click on the image.
Unknown coordinates until you click on the image.
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