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PC COLOR Graphics Emulation on a Large High Resolution Monochrome Display

IP.com Disclosure Number: IPCOM000034624D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 13K

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 4x4 matrix. Colors can then be simulated by turning on or off different combinations of the 16 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 pel image of greater than or equal to 1280 x 1024 pels.

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PC COLOR Graphics Emulation on a Large 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 4x4 matrix. Colors can then be simulated by turning on or off different combinations of the 16 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 pel image of greater than or equal to 1280 x 1024 pels. The problem was how to map the 320 x 200 image onto the 1280 x 1024 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 1280 x 800 pels is produced and then centered on the 1280 x 1024-pel 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 color as defined by the two corresponding bits in the display bit map buffer.

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