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- Newsgroups: comp.sys.sgi
- Path: sparky!uunet!stanford.edu!EE.Stanford.EDU!baroque.Stanford.EDU!paul
- From: paul@baroque.Stanford.EDU (Paul Ning)
- Subject: Problem with gamcal
- Message-ID: <PAUL.92Aug30164022@baroque.Stanford.EDU>
- Sender: usenet@EE.Stanford.EDU (Usenet)
- Organization: Stanford University
- Date: 30 Aug 92 16:40:22
- Lines: 24
-
-
- Using gamcal to calibrate my monitor, I got a screen that looked
- too washed out. Putting up a gray scale ramp (0 to 255 in equal
- steps) confirmed that the (perceived) brightness steps were far
- from linear.
-
- After a bit of experimenting, I discovered that alternating B&W
- *vertical* lines were darker than gamcal's *horizontal* lines.
- I'm not sure why this happens (perhaps it has something to do with the
- geometry of the triads) but calibrating according to the vertical
- lines produced a more linear ramp of brightnesses as well as a more
- pleasant screen appearance. I also tried calibrating to a B&W
- checkerboard pattern and results were consistent with those for
- vertical lines.
-
- Has anyone else run into this problem? Any explanations for why
- horizontal lines don't work well?
-
- - paul
-
- ------------------------------------------------------------------------
- Paul Ning U.S. mail : P.O. Box 9738
- Dept. of Elec. Engr. Stanford, CA 94309-9738
- Stanford University e-mail : paul@kaos.stanford.edu
-