A reader writes:
When someone makes an image that looks like an ordinary internet-based picture of the shroud, he has made an image that actually looks nothing like the image on the shroud. Viewed directly, the shroud image is so faint, so lacking in outlines, and so devoid of abrupt shifts in color tone that most people cannot see it at all from closer than about five feet. The lightest to the darkest shades of the image are confined to less than five percent of the grayscale. With linear contrast enhancement, the nearly invisible image becomes completely scalable without any noticeable saturation plateaus.
Colin needs to start over.
*The picture shown here is extracted from a photograph by Barrie Schwortz. Reducing the size from life-size has the same effect as stepping back several feet. I saw a demonstration of this phenomenon a couple of years ago. I think it was at the High Museum of Art in Atlanta, but I can’t remember of sure. It had nothing to do with the shroud and everything to do with how we perceive things with our eyes. The concept was the same, however.
yep
Does reader seriously imagine that a scorch mark is permanent for all time? Has reader never used the hydrogen peroxide trick to remove an ironing scorch? Yup, that’s all that’s needed to bleach a scorch – a source of active oxygen. Ground level ozone probably works too, even ordinary atmospheric oxygen if you are prepared to wait decades – or centuries…
It’s all explainable in terms of conjugated double bonds, chromophores etc etc but I’ll spare you a chemistry lesson.