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)" <[email protected]> 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:[email protected]] > Sent: Monday, March 03, 2014 10:40 AM > To: Basques, Bob (CI-StPaul) > Cc: [email protected] > 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)" > <[email protected]> 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 > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users >
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