English to Portuguese Tech/Engineering Computers: Software Architecture, CAD Drawing/Printing

O termo está relacionado a impressão e a Estilos de plotagem no Autocad. No final, listo sites de referência:
Seguem os trechos onde o termo aparece:

"...you might want to change the way certain parts of the drawing appear in the printed output...
You can think of plot styles as a way to translate the colors and fills in an AutoCAD drawing into different colors and patterns. You can control whether the color red on you AutoCAD screen is printed in black or gray or even green, or you can control whether an AREA FILLED IN SOLID BLACK IS SCREENED TO 30 PERCENT. "

"Color plot styles let you control printer output based on the color you assigned to the objects in your drawing. For example, you can tell AutoCAD to print the color red as black using a 50 PERCENT SCREEN or as a line width of 0.5mm."

The Standard Color Plot-Style Tables:

Screening xxx%.ctb --> Converts all Autocad colors into a SCREENED VALUE indicated by the Plot Style name (xxx is the SCREEN PERCENTAGE)

The Standard Named Plot-Style Tables:

Autodesk-Color.stb --> Includes SCREENED "COLORS" from solid (100 percent) to 10 percent. Uses object color for printed color.

"Plot styles can translate colors and fills into shades of gray and HALFTONE SCREENS"

http://www.inap.com.br/pdfs/apostilas/apostila de cad.pdf (digite em Find a palavra-chave "Utilizando a filtragem")
http://en.wikipedia.org/wiki/Halftone
http://pt.wikipedia.org/wiki/Meio-tom