PC Color Graphics Emulation on a High Resolution Monochrome Display
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
By mapping a Personal Computer (PC) color graphics image to a high resolution monochrome display while, at the same time correcting the aspect ratio, a new image is produced with a new logical pel (picture element) unit consisting of a 2x2 matrix. Colors can then be simulated by turning on or off different combinations of the four pels within each logical pel unit. A medium resolution four-color graphics image on a PC Color Display (with a physical resolution of 640 x 200 pels) consists of a 320 x 200 logical pel image with a logical pel consisting of two consecutive physical pels. The high resolution monochrome display which was used for the emulation is an all-points-addressable (APA) display with a square pel ratio and a 720 x 512-pel image.