When user set the color of the lines created in drafting to black and Zoom in
or zoom out the line, its color will be displayed in gray.
The behavior is probably related to Full Scene Antialiasing (FSAA), which is a
graphics technique for smoothing geometry appearance. The FSAA smoothing
algorithm involves blending the colors of adjacent pixels. For a one-pixel-wide
black line displayed on a white background, blending the black and white pixels
can yield gray.
Users who are troubled by this can disable Full Scene Antialiasing as a 'ON'
form the General Graphics tab of Preferences -> Visualization Performance.
Notes and References
OS Version: 764