folta@tove.cs.umd.edu (Wayne Folta) (04/23/91)
I had to get a board in our Apple Hi-Res RGB monitor replaced. When we got it
back, the grays looked noticeably green. I took it back and they said that the
board was bad, and gave me a new one. Now the grays look brownish.
Should the grays look gray? It seems like the original grays were gray, but
maybe they were brownish, too.
Here is my test for grayness:
1. Enter Image, or a similar painting environment.
2. Draw some rectangles and fill them with 25, 50, and 75% gray,
respectively.
3. In the middle of each rectangle, select a portion and select Dither.
You will now have gray rectangles surrounding simulated grays. The simulated
grays and real grays should match as closely as 1-bit dithering will allow.
On our machine, the "true" grays show a brown tinge. Black and white look
pure. Of course, this means that the dithered grays will be quite pure as well.
Any comments? Also, how difficult should it be to get the grays to be gray?
First I was told that it was a simple adjustment, then when I wanted to
watch them adjust it to my standards they said it could take hours.
--
Wayne Folta (folta@cs.umd.edu 128.8.128.8)yee@osf.org (Michael K. Yee) (04/23/91)
In article <33379@mimsy.umd.edu> folta@tove.cs.umd.edu (Wayne Folta) writes:
Should the grays look gray? It seems like the original grays were gray, but
maybe they were brownish, too.
Have you degaussed your monitor? The Apple Hi-res RGB monitor's degauss
button is on the back of the monitor near the power switch. Also check the
monitor cable connector for a bad contact.
=Mike
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