# Color based stereo mode with intel iMac Radeon X1600 broken? **URL:** \ **Category:** Uncategorized\ **Created:** [October 14, 2008, 8:47am UTC](https://psychtoolbox.discourse.group/t/color-based-stereo-mode-with-intel-imac-radeon-x1600-broken/1181 "2008-10-14T08:47:59Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![elchrizzo](https://avatars.discourse-cdn.com/v4/letter/e/4bbf92/32.png) [@elchrizzo](https://psychtoolbox.discourse.group/u/elchrizzo)\ **Post date:** [October 14, 2008, 8:47am UTC](https://psychtoolbox.discourse.group/t/color-based-stereo-mode-with-intel-imac-radeon-x1600-broken/1181/1 "2008-10-14T08:47:59Z")
Hi, I am running into a strange problem here. I have a second monitor (CRT) connected to my iMac (Intel, with a Radeon X1600) to test 'experiments in programming progress'. Currently, I am no longer able to use stereo mode based on color seperation (red-green, red-blue, whatever). Mirror stereoscope separation still works, but all the colored options just display in white rather than the color they should be. I have tested the CRT with my powerbook and then it still works fine, so the problem must be with the iMac. It used to work before, but I hadn't used stereomode in a while and now I have these problems that I cannot relate to any specific update. It does not just happen with my own programs; the StereDemo has the same issues. Mirror mode does not solve anything either. I am running leopard 10.5.5, matlab R2007b and PTB 3.0.8. What am I missing here? thanks in advance, Chris ---
**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Post date:** [October 14, 2008, 3:55pm UTC](https://psychtoolbox.discourse.group/t/color-based-stereo-mode-with-intel-imac-radeon-x1600-broken/1181/2 "2008-10-14T15:55:15Z")
It's a bug, introduced in one of the latest beta updates, due to interaction with a new feature. It affects all systems in an anaglyph stereo mode. Its already fixed and will be part of the next beta release. However, the anaglyph stereo which is demonstrated in StereoDemo is mostly meant for owners of old graphics hardware and only provides simple anaglyph support. Give ImagingStereoDemo(8) a try. Its nearly the same as StereoDemo(8), and nearly the same code, but uses the more advanced anaglyph stereo implementation of the imaging pipeline, which gives you much more control over the anaglyph rendering for a better color separation and other funky things: help SetAnaglyphStereoParameters for an overview. This works properly with current beta on your hardware. ImagingStereoMoviePlayer is a stereo movie player for Quicktime movies which shows some of the really cool anaglyph rendering methods which even allow some partial color reproduction. Good demo movies e.g., at: \<[http://www.stereomaker.net/sample/index.html](http://www.stereomaker.net/sample/index.html)\> best, -mario > --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Chris Klink" \ wrote: > \> > \> Hi, > \> > \> I am running into a strange problem here. I have a second monitor (CRT) connected to > my > \> iMac (Intel, with a Radeon X1600) to test 'experiments in programming progress'. > Currently, I > \> am no longer able to use stereo mode based on color seperation (red-green, red-blue, > \> whatever). Mirror stereoscope separation still works, but all the colored options just > display > \> in white rather than the color they should be. > \> > \> I have tested the CRT with my powerbook and then it still works fine, so the problem > must be > \> with the iMac. It used to work before, but I hadn't used stereomode in a while and now I > have > \> these problems that I cannot relate to any specific update. It does not just happen with > my > \> own programs; the StereDemo has the same issues. Mirror mode does not solve > anything > \> either. I am running leopard 10.5.5, matlab R2007b and PTB 3.0.8. > \> > \> What am I missing here? > \> > \> thanks in advance, > \> Chris > \> ---
**Author:** ![elchrizzo](https://avatars.discourse-cdn.com/v4/letter/e/4bbf92/32.png) [@elchrizzo](https://psychtoolbox.discourse.group/u/elchrizzo)\ **Post date:** [October 14, 2008, 3:23pm UTC](https://psychtoolbox.discourse.group/t/color-based-stereo-mode-with-intel-imac-radeon-x1600-broken/1181/3 "2008-10-14T15:23:07Z")
A short follow-up on the problem. My colleague downloaded the lates PTB and tried the stereodemo on his Intel Mac Pro with an NVIDIA GFORCE 7300GT videocard resulting in the same problem. He also uses matlab r2007b and leopard 10.5.5, so it's unlikely to be the specific videocard that's causing the problem. The problem is absent on a PowerPC G5 running Tiger or a Powerbook G4 running Leopard which causes us to believe it's an Intel problem arising from one of the last leopard updates (It ran on my intel imac before), but I do not have a clue which critical update caused the problems. Hope this helps, Chris > --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Chris Klink" \ wrote: > \> > \> Hi, > \> > \> I am running into a strange problem here. I have a second monitor (CRT) connected to > my > \> iMac (Intel, with a Radeon X1600) to test 'experiments in programming progress'. > Currently, I > \> am no longer able to use stereo mode based on color seperation (red-green, red-blue, > \> whatever). Mirror stereoscope separation still works, but all the colored options just > display > \> in white rather than the color they should be. > \> > \> I have tested the CRT with my powerbook and then it still works fine, so the problem > must be > \> with the iMac. It used to work before, but I hadn't used stereomode in a while and now I > have > \> these problems that I cannot relate to any specific update. It does not just happen with > my > \> own programs; the StereDemo has the same issues. Mirror mode does not solve > anything > \> either. I am running leopard 10.5.5, matlab R2007b and PTB 3.0.8. > \> > \> What am I missing here? > \> > \> thanks in advance, > \> Chris > \> ---
**Author:** ![elchrizzo](https://avatars.discourse-cdn.com/v4/letter/e/4bbf92/32.png) [@elchrizzo](https://psychtoolbox.discourse.group/u/elchrizzo)\ **Post date:** [October 14, 2008, 4:51pm UTC](https://psychtoolbox.discourse.group/t/color-based-stereo-mode-with-intel-imac-radeon-x1600-broken/1181/4 "2008-10-14T16:51:15Z")
Thanks Mario, That works just fine! best, Chris > --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Mario Kleiner" \ wrote: > \> > \> It's a bug, introduced in one of the latest beta updates, > \> due to interaction with a new feature. It affects all > \> systems in an anaglyph stereo mode. > \> > \> Its already fixed and will be part of the next beta release. > \> However, the anaglyph stereo which is demonstrated > \> in StereoDemo is mostly meant for owners of old > \> graphics hardware and only provides simple anaglyph > \> support. > \> > \> Give ImagingStereoDemo(8) a try. Its nearly the same > \> as StereoDemo(8), and nearly the same code, but uses > \> the more advanced anaglyph stereo implementation of > \> the imaging pipeline, which gives you much more control > \> over the anaglyph rendering for a better color separation > \> and other funky things: > \> > \> help SetAnaglyphStereoParameters > \> > \> for an overview. This works properly with current beta > \> on your hardware. > \> > \> ImagingStereoMoviePlayer is a stereo movie player > \> for Quicktime movies which shows some of the > \> really cool anaglyph rendering methods which even > \> allow some partial color reproduction. Good demo movies > \> e.g., at: > \> > \> \<[http://www.stereomaker.net/sample/index.html](http://www.stereomaker.net/sample/index.html)\> > \> > \> best, > \> -mario > \> > \> > \> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Chris Klink" \ wrote: > \> \> > \> \> Hi, > \> \> > \> \> I am running into a strange problem here. I have a second monitor (CRT) connected to > \> my > \> \> iMac (Intel, with a Radeon X1600) to test 'experiments in programming progress'. > \> Currently, I > \> \> am no longer able to use stereo mode based on color seperation (red-green, red- > blue, > \> \> whatever). Mirror stereoscope separation still works, but all the colored options just > \> display > \> \> in white rather than the color they should be. > \> \> > \> \> I have tested the CRT with my powerbook and then it still works fine, so the problem > \> must be > \> \> with the iMac. It used to work before, but I hadn't used stereomode in a while and > now I > \> have > \> \> these problems that I cannot relate to any specific update. It does not just happen > with > \> my > \> \> own programs; the StereDemo has the same issues. Mirror mode does not solve > \> anything > \> \> either. I am running leopard 10.5.5, matlab R2007b and PTB 3.0.8. > \> \> > \> \> What am I missing here? > \> \> > \> \> thanks in advance, > \> \> Chris > \> \> > \>