13501ADC@MSU.BITNET (Alan Cabrera) (10/19/87)
Hello.
I have a color terminal that allows a display of 256 colors from a palatte
of 16 million. I would like to be able to display more colors at a time.
The resolution of the screen is 1280 by 1024. Would I be able to do a
color dither if I was willing to put up with the decreased resolution?
Can anybody point me in the right direction?
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Alan D. Cabrera Bitnet: 13501adc@msu
Computer Laboratory Internet: cabreraad@clvax1.cl.msu.edu
Room 400d Computer Center
Michigan State University
East Lansing, Michigan 48824-1042rick@datacube.UUCP (10/27/87)
/* Written 3:48 pm Oct 19, 1987 by 13501adc@msu.bitnet */ /* ---------- "More colors" ---------- */ >I have a color terminal that allows a display of 256 colors from a palatte >of 16 million. I would like to be able to display more colors at a time. >The resolution of the screen is 1280 by 1024. Would I be able to do a >color dither if I was willing to put up with the decreased resolution? /* End of text from adc@msu.bitnet */ No, You do not have to give up any resolution, if you can get to the color palatte and have interrupts from the Horizontal Synch. This is assuming that you probably have a computer, not a terminal. The trick is to change the pallate table during horizontal retrace. This will give you probably in excess of 4K worth of color. However, it also means you must write a complex program that knows about the given colors in each scan line. Dithering will increase your available colors only slightly, (perhaps 2-3X), but with corresponding loss in resolution. Either way, you'll have to either modify the original picture, (Easy for dithering), or generate 256K's worth of pallate table values, based on the original's line color composition, not to mention if the hardware's there. Rick Cooley ---------------------------------------------- ------ Datacube Inc. / /| 4 Dearborn Rd. ------ | Peabody, Ma 01960 || \| | ihnp4!datacube!rick || /|/ Human:(617)535-6644 ------ Fax: (617)535-5643