flatten

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flatten

To remove structural information, especially to filter something with an implicit tree structure into a simple sequence of leaves; also tends to imply mapping to flat ASCII. "This code flattens an expression with parentheses into an equivalent canonical form."
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

flatten layers

To bring all levels of a multi-layered image down to one plane. High-end graphics programs provide a multi-layer file format, such as the Photoshop Document (PSD), which enables elements in each layer to be manipulated independently. In order to save the layered image in a single-layer graphics format such as TIFF or JPEG, the image is said to be "flattened."

An Adobe PDF file is also flattened to remove a transparency layer when the document is rendered in a printer or in an application that does not support the additional layer. See layers and PSD.
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References in periodicals archive ?
AKMAL flattened out towards the end of the last campaign, but he remains some way clear of most of his rivals in the totesport.com ''Further Flight'''' Stakes at Nottingham.
John Dunlop's flashy stayer may have flattened out towards the end of the last campaign, but he remains some way clear of most of his rivals in the totesport.com "Further Flight" Stakes at Nottingham.
Eberle's photograph, taken in the 1963 Tennessee Pipeline Company Building in Houston, shows a dense grid of small illuminated squares emerging from a dark background, though the light and dark areas are so flattened out that it is impossible to discern scale or material.