"ingo" <ing### [at] tagpovrayorg> wrote in message
news:Xns### [at] povrayorg...
> in news:3e9a4670@news.povray.org Will W wrote:

> I think I should add a note to the above mentioned paragraph that explains
> that flatscreens don't have the same gamma-curve as CRT's

Exactly so.

> and that thus
> the method won't work (although the result may look resonable).

No.

First you are contradicting yourself. If the results of the display_gamma
adjustment look more reasonable than they did before, then the system is in
better adjustment for your situation than it had been. Which is all that one
can hope to achieve no matter what type of display you've got.

It is true that the procedure given in the POV docs was designed to take
advantage of side effects of CRT technology-- on  a flat screen you don't
get the necessary blurring of raster lines that analog CRT phosphors
provide. That isn't a problem for me-- I just take off my glasses. Or you
can unfocus your vision to get the requisite blurring.

It is also true that the rate of change in brightness as one approaches the
extremes is different for flatscreens and CRTs, but that doesn't invalidate
the procedure. The procedure adjusts the central value of medium gray--
whether your whites are whiter and your blacks are blacker than someone
else's is a different thing entirely. And it doesn't even touch color
balance. (Paint Shop Pro has a color gamma calibration procedure that can
help with that).

> If you want to use flatscreens for graphics work you need one that is
> designed for it.

If I had everything I wanted, I'd be riding a powerful horse rather than
trudging along this muddy rut :-)

Thanks for your input.


--
Will Woodhull
Thornhenge, SW Oregon, USA
willl.at.thornhenge.net

Post a reply to this message