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PC Color Graphics Emulation on a High Resolution Monochrome Display

IP.com Disclosure Number: IPCOM000062438D
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Blackard, JW: AUTHOR [+2]

Abstract

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.

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PC Color Graphics Emulation on a High Resolution Monochrome Display

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. The problem was how to map the 320 x 200 image onto the 720 x 512 display and how to simulate the four colors on the monochrome display. This problem was solved by first mapping the color graphics image to the monochrome display and, at the same time, correcting the aspect ratio. As a result of correcting the aspect ratio, a new image which is 640 by 400 pels is produced and then centered on the 720 by 512 monochrome display. The replicated scan rows allow a new logical pel unit to be defined. On a PC color display in the 320 by 200 mode, the logical pel unit consists of two consecutive pels on the same scan row. The two pels are both set to the same colo...