mel@houxm.UUCP (08/19/83)
I have been working daily at CRT's for 16 years or so (graphics and alpha), and have had to use just about every color combination for long periods. I find the single colors very hard on the eyes. A pure green or blue gives me a headache almost instantly if I have to really read what is presented (not just watching a demo). I have the same trouble with lighted advertising signs - a pure green or blue seems to send the focus nerves off-scale. A mixed phospher screen seems to be much better (the usual "white" or the newer "yellow" screens [although, I suppose either could also be made with a single wave-length phospher, too.]). From a health point of view, I suppose that the single color phospher takes more energy (X-rays, ultra-violet, and all that good for you stuff) to produce the same perceived contrast. Does anyone have a data on this? For the same reason, I would advocate never using the dark letters on a lighted (radiating) background; but wouldn't do that anyway because of the annoying dark border (and on most screens, the 1st characters being right on the edge). Mel Haas , houxm!mel