Quantum Data 801GC - Manual (Page 54)

4-16 Chapter 4: Built-In Images Model 801GC, 801GF & 801GX¥Rev. X1
CirclesL
Description This image may be called for by some display
manufacturers’ test procedures. The image consists
of five large white circles on a black background.
The circles are positioned in the center and in the
corners of the active video area.
The secondary version inverts the image to black
circles on a white background.
Purpose This pattern is specified by one or more monitor
manufacturers for checking and adjusting video
scan size, linearity and over scanning.