shadowgram


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shadowgram

the shades of gray at the edge of an image on a radiograph. They are the features that the expert can interpret; they define the silhouette of the object being imaged.
References in periodicals archive ?
For more than a quarter of a century Scotty delivered the annual Shadowgram, a twilight talk at Stellafane, during which he'd discuss, among other things, the changing state of telescope making.
Students will learn to make various types of hologram starting with single beam denisyuk and progressing onto shadowgrams, master transfer rainbow transmission holograms and then working with the pulse laser.
Cox, who edited this magazine's Gleanings for ATM's department; and the young, pipe-smoking Walter Scott Houston, whose evening talks, called Shadowgrams, reminisced about Stellafane's history.