Keith Packard wrote:
|
|
|Around 10 o'clock on Sep 15, Sidik Isani wrote:
|
|> Unfortunately, there is. We look at astronomy CCD images, and
|> the visualization tools like to manipulate a colormap to give a
|> quick contrast adjustment.
|
|If you have source, you could consider fixing these to use DirectColor
|instead; that would permit adjusting the luminence curves on the fly.
|But, I suspect you also like to switch colors around, which this would not
|do.
It may be enough. Usually we look at our images with simple
grey scales, and just need a way to exaggerate contrast to bring
out features. I'd like to learn more about DirectColor. How much
control does it give over luminence curves? Which XFree86 drivers
support it (at depths > 8bpp)?
|I assume these tools are creating their own colormaps; if this is the
|case, you might consider using StaticColor for the default visual, this
|would avoid flashing among the other windows while still permitting the
|display to run at 8 bits.
Thanks. I'll give that a try too.
|> Since we had some Matrox cards lying around,
|> I gave the Overlay feature a try and our applications work well with that.
|> We'd have to order some PCI versions to be able to plug three in, and we'd
|> have to use multi-link converters on each monitor.
|
|Analog signals to your digital monitors. Yuck.
Indeed. But Matrox has a digital version (or add-on?) to the card.
It would still require the use of the multi-link to go from one
digital interface to another though. Yuck.
|> If we run only one screen in Overlay mode and exclude it from the
|> Xinerama desktop, I guess that could work, but we'd prefer one
|> logical screen, of course, even if dragging a pseudocolor window
|> out of the Overlay'd screen made it appear black/garbage on the
|> other monitors which don't support Overlay.
|
|Xinerama exposes the intersection of the screen capabilities, not the
|union. It would be a significant undertaking to change that. It also
|doesn't allow you to split things so that some screens are xinerama'd and
|others are not.
Would "x2x" plus 2 screen layouts do the trick?
|In the long term, however, the RandR extension will allow unsupported
|visual classes to be emulated in software. This, in conjunction with
|Xinerama, would allow you to use one card with hardware overlays while
|emulating the overlay in software on the other two cards. I'm still
|struggling over how to make this work with the existing XFree86
|architecture though; don't expect news on this front anytime soon.
Ok, good to know though.
|I think that for now, you should whack the number of colors reserved for
|the Render extension; eventually that will probably make it into the
|configuration file.
That sounds like a reasonable solution. Do any popular programs
require Render? Can I just leave this extension out completely
for this application?
Thanks,
- Sidik
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