Norman, I would imagine there is a similar blackout event for folks in airplanes (pilots) as well.
Bobb From: Norman Vine [mailto:n...@cape.com] Sent: Monday, March 03, 2014 11:10 AM To: Basques, Bob (CI-StPaul) Cc: mapserver-users@lists.osgeo.org Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps) Bob We started with the Standard NOAA chart palette foray then used a gamma function to tone this down for Dawn/Dusk but used a special night time palette based on user feedback note that at sea there is usually a 'blackout environment' which is much darker then most Have you seen this project ? http://jonls.dk/redshift/ Norman On Mar 3, 2014, at 11:49 AM, "Basques, Bob (CI-StPaul)" <bob.basq...@ci.stpaul.mn.us<mailto:bob.basq...@ci.stpaul.mn.us>> wrote: Hi Norman, I had another thought after I sent the first post. Maybe something along the lines of an inside/outside view switcher. The outside mode would self correct based on the location/time settings. I'm really interested in this automated approach to making the settings change. I have even worked out how I can make the changes to a mapfile could work from a config file. I just need the actual RGB conversion routine to try out the idea. Optimum settings for those three values you described would get things started, then I would need to figure out the best approach to apply by location/time, (heck, you could even factor in weather conditions down the line . . .) bobb From: Norman Vine [mailto:n...@cape.com<http://cape.com>] Sent: Monday, March 03, 2014 10:40 AM To: Basques, Bob (CI-StPaul) Cc: mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org> Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps) Bob Back in the day when I was working on marine navigation chart displays we used separate color tables for different light conditions we found that 3 tables sufficed, Day, Dusk/Dawn, Night we cheated a bit and used 64 bit palettes this way with a little trickery we could pack everything into a normal 8 bit color table In practice this worked quite well HTH Norman On Mar 3, 2014, at 11:30 AM, "Basques, Bob (CI-StPaul)" <bob.basq...@ci.stpaul.mn.us<mailto:bob.basq...@ci.stpaul.mn.us>> wrote: All, So, I've been reading up on nighttime colors for electronic display(s). I was wondering if anyone has any pointers on information about applying color temperature corrections to displays for nighttime viewing. I'm in need of providing this functionality to some night crew workers. My first thought was to apply some sort of RGB algorithm to the mapfile color settings. Then I thought maybe a middleware processor routine (between MapServer and the browser) might be a better approach, or possibly using something in the browser . . . I'm only looking at setting up distinct color settings at the moment. Maybe 3-5 ranges to start with. I do know that some Mac hardware has some display monitoring for color temperature. I would prefer to do something that could apply globally however. Maybe there are Browser functions that can be applied to the problem (I haven't found anything specific there yet though. Thanks Bobb _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org> http://lists.osgeo.org/mailman/listinfo/mapserver-users
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