Autodesk 05726-091452-9060 User Guide - Page 87

7 Binarization and Color Separation Binarization Binarization creates a new monochrome image of a specified color, which is placed on the specified layer. Using the specific criterion the program defines which pixels of the original (color or grayscale) image should become black (foreground pixels), and which ones should become white (background pixels), and then generates a monochrome image and places it on a new raster layer. The criterion for division of pixels into two sets is defined by the selected binarization method and its parameters (threshold values or a set of color range). Binarization methods To convert color and grayscale images to monochrome, various conversion algorithms are used, called binarization methods. It is recommended that you choose a conversion method appropriate to the image type. Threshold by Grey Threshold by Grey converts color pixels with brightness values above the specified level to background dots, and it converts pixels below this level to image dots. This method may be used for converting both color and grayscale images. When converting a grayscale image, WiseImage uses its grey levels. When converting a color image, the grey levels are defined by the brightness value of color pixels. Threshold by RGB When using Threshold by RGB, you should define three threshold levels for the Red, Green, and Blue components. WiseImage converts color dots with Red, Green and Blue values below the appropriate threshold levels to black dots (image dots) of the monochrome image. Range by Grey Range by Grey allows you to convert color dots with any brightness value to image dots. Using this method, you first specify several basic grey levels. These levels are used as midpoints for ranges. For each of the specified levels, you can define a range half-length. A range half-length is a number of grey levels below and above the specified grey level. Range by Grey converts pixels that have grey values within all specified ranges to foreground dots. Other pixels are converted to background dots. This method may also be used for converting color and grayscale images. Grey levels for color dots are calculated as described in Threshold by Grey. 89