Blocked up
A piece of an overexposed and/or overdeveloped negative so thick with silver halides that texture and detail in the subject are blurred.
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More Photographic Terms ...
-Blocked up - a portion of an overexposed and/or overdeveloped negative so dense with silver halides that texture and detail in the subject are unclear.
Blocked up shadows are a common problem in photography since the subject brightness range capable of being captured on digital or film is so much less than what our eyes can see.
Lost Shadow Detail: Lost shadow detail results in blocked up areas that reveal little or no subject information. If the RAW capture does have some pixel detail embedded, bringing it out with software results in a file that’s noisy.
While there are no hard rules, slide film can get blocked up and become very dense from the many shadow areas making it difficult to get good scans.
The Brightness and Contrast adjustment was vastly improved in Photoshop CS3 so it operated similarly to Curves and no longer blocked up shadows and blew out highlights.
In the past, pigments blocked up across the board, but these have a transparency to them. It's as if these inks pour light onto the paper." Turner finds that Epson's Premium Luster Photo Paper is perfectly suited to the K3 inks.
in a constant and uniform manner, in an experiment showing that the intensity of the light-spot formed by the projection of the moonlight through two small apertures onto a screen diminishes constantly as one of the apertures is gradually blocked up.
When detail is lacking because the highlights are too dark, the highlights are too dense or blocked up. Excessive highlight density is caused by overexposure and/or overdevelopment.
 See also: Light, Image, Back, Subject, Photograph
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