Re: [mapserver-users] Color temperature control (night-time viewing of maps)
Just resurrecting this thread to post some new info about night viewing. All, I stumbled upon a couple of interesting browser plugins for Chrome for Nighttime viewing of pages. One is called "Deluminate", the other is called "Dark Reader", they both work pretty good, I prefer Dark reader so far, but you could install them both as I have, and use whichever whenever. bobb -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Color-temperature-control-night-time-viewing-of-maps-tp5107155p5240422.html Sent from the Mapserver - User mailing list archive at Nabble.com. ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
Stephan, Build from your pointer (already) by someone else: https://github.com/kybernetikos/SolarPosition -Original Message- From: Stephen Woodbridge [mailto:wood...@swoodbridge.com] Sent: Monday, March 03, 2014 11:45 AM To: Basques, Bob (CI-StPaul); mapserver-users@lists.osgeo.org Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps) Bob, Checkout this page: http://williams.best.vwh.net/sunrise_sunset_algorithm.htm -Steve On 3/3/2014 11:55 AM, Basques, Bob (CI-StPaul) wrote: > Hi Stephen, > > Yes, that looks like the correct route for this, time/location settings, at > least to make something work globally. The display is for a mapping > interface that will most likely be location aware. I've found a couple of > references to some LIBs for finding terminator, and I think a temperature > curve could be defined based on optimum settings from day/dusk/night views to > make the map readable for all (natural) lighting conditions. At least that's > a place to start. > > Bobb > > > -Original Message- > From: mapserver-users-boun...@lists.osgeo.org > [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Stephen > Woodbridge > Sent: Monday, March 03, 2014 10:46 AM > To: mapserver-users@lists.osgeo.org > Subject: Re: [mapserver-users] Color temperature control (night-time > viewing of maps) > > On 3/3/2014 11:30 AM, Basques, Bob (CI-StPaul) 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. > > Bob, > > One simple way to deal with this is to have two mapfiles with different > colors setup on them and then you a substitution to switch between the day > and night mapfile. > > I wrote some code years ago that detects the day-night night terminator line > in javascript to you can make the change. you need to know the browser > location to compute this accurately. but a simple [day/night] toggle button > would allow the user to switch manually. > > -Steve W > > ___ > mapserver-users mailing list > mapserver-users@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/mapserver-users > > ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
Better to just point folks here I think: http://stackoverflow.com/questions/6182451/how-to-calculate-the-sunrise-and-sunset-in-javascript All sorts of links to different things related to sun and location. Bobb -Original Message- From: Stephen Woodbridge [mailto:wood...@swoodbridge.com] Sent: Monday, March 03, 2014 11:45 AM To: Basques, Bob (CI-StPaul); mapserver-users@lists.osgeo.org Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps) Bob, Checkout this page: http://williams.best.vwh.net/sunrise_sunset_algorithm.htm -Steve On 3/3/2014 11:55 AM, Basques, Bob (CI-StPaul) wrote: > Hi Stephen, > > Yes, that looks like the correct route for this, time/location settings, at > least to make something work globally. The display is for a mapping > interface that will most likely be location aware. I've found a couple of > references to some LIBs for finding terminator, and I think a temperature > curve could be defined based on optimum settings from day/dusk/night views to > make the map readable for all (natural) lighting conditions. At least that's > a place to start. > > Bobb > > > -Original Message- > From: mapserver-users-boun...@lists.osgeo.org > [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Stephen > Woodbridge > Sent: Monday, March 03, 2014 10:46 AM > To: mapserver-users@lists.osgeo.org > Subject: Re: [mapserver-users] Color temperature control (night-time > viewing of maps) > > On 3/3/2014 11:30 AM, Basques, Bob (CI-StPaul) 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. > > Bob, > > One simple way to deal with this is to have two mapfiles with different > colors setup on them and then you a substitution to switch between the day > and night mapfile. > > I wrote some code years ago that detects the day-night night terminator line > in javascript to you can make the change. you need to know the browser > location to compute this accurately. but a simple [day/night] toggle button > would allow the user to switch manually. > > -Steve W > > ___ > mapserver-users mailing list > mapserver-users@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/mapserver-users > > ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
David, Night vision is the bigger problem. Many users will be driving on dispatch tickets, etc. Don't want to introduce a fatiguing function to the night drivers. This is purely a demo mode of display for now. The idea being to put something out for feedback from the end users. Bobb From: Fawcett, David (MNIT) Sent: Monday, March 03, 2014 11:52 AM To: Basques, Bob (CI-StPaul); mapserver-users@lists.osgeo.org Subject: RE: [mapserver-users] Color temperature control (night-time viewing of maps) Bob, Are you thinking of preserving night vision or pumping up the blue to keep people more awake? David. From: mapserver-users-boun...@lists.osgeo.org<mailto:mapserver-users-boun...@lists.osgeo.org> [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Basques, Bob (CI-StPaul) Sent: Monday, March 03, 2014 10:31 AM To: mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org> Subject: [mapserver-users] Color temperature control (night-time viewing of maps) 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 http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
Bob, Are you thinking of preserving night vision or pumping up the blue to keep people more awake? David. From: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Basques, Bob (CI-StPaul) Sent: Monday, March 03, 2014 10:31 AM To: mapserver-users@lists.osgeo.org Subject: [mapserver-users] Color temperature control (night-time viewing of maps) 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 http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
Bob, Checkout this page: http://williams.best.vwh.net/sunrise_sunset_algorithm.htm -Steve On 3/3/2014 11:55 AM, Basques, Bob (CI-StPaul) wrote: Hi Stephen, Yes, that looks like the correct route for this, time/location settings, at least to make something work globally. The display is for a mapping interface that will most likely be location aware. I've found a couple of references to some LIBs for finding terminator, and I think a temperature curve could be defined based on optimum settings from day/dusk/night views to make the map readable for all (natural) lighting conditions. At least that's a place to start. Bobb -Original Message- From: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Stephen Woodbridge Sent: Monday, March 03, 2014 10:46 AM To: mapserver-users@lists.osgeo.org Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps) On 3/3/2014 11:30 AM, Basques, Bob (CI-StPaul) 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. Bob, One simple way to deal with this is to have two mapfiles with different colors setup on them and then you a substitution to switch between the day and night mapfile. I wrote some code years ago that detects the day-night night terminator line in javascript to you can make the change. you need to know the browser location to compute this accurately. but a simple [day/night] toggle button would allow the user to switch manually. -Steve W ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
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)" 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)" 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 ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
All, Just found this: http://www.paulirish.com/demo/invert Might be a good start. . . Also, I thought the "Command-Option-Ctrl-8" key combination on Mac's is a really cool option.!! Bobb -Original Message- From: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Lime, Steve D (MNIT) Sent: Monday, March 03, 2014 10:51 AM To: Stephen Woodbridge; mapserver-users@lists.osgeo.org Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps) Could also use class groups and send the appropriate group value with your request. Steve -Original Message- From: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Stephen Woodbridge Sent: Monday, March 03, 2014 10:46 AM To: mapserver-users@lists.osgeo.org Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps) On 3/3/2014 11:30 AM, Basques, Bob (CI-StPaul) 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. Bob, One simple way to deal with this is to have two mapfiles with different colors setup on them and then you a substitution to switch between the day and night mapfile. I wrote some code years ago that detects the day-night night terminator line in javascript to you can make the change. you need to know the browser location to compute this accurately. but a simple [day/night] toggle button would allow the user to switch manually. -Steve W ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
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)" 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] > Sent: Monday, March 03, 2014 10:40 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 > > 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)" > 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 > http://lists.osgeo.org/mailman/listinfo/mapserver-users > ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
Could also use class groups and send the appropriate group value with your request. Steve -Original Message- From: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Stephen Woodbridge Sent: Monday, March 03, 2014 10:46 AM To: mapserver-users@lists.osgeo.org Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps) On 3/3/2014 11:30 AM, Basques, Bob (CI-StPaul) 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. Bob, One simple way to deal with this is to have two mapfiles with different colors setup on them and then you a substitution to switch between the day and night mapfile. I wrote some code years ago that detects the day-night night terminator line in javascript to you can make the change. you need to know the browser location to compute this accurately. but a simple [day/night] toggle button would allow the user to switch manually. -Steve W ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
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] Sent: Monday, March 03, 2014 10:40 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 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)" 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 ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
Hi Stephen, Yes, that looks like the correct route for this, time/location settings, at least to make something work globally. The display is for a mapping interface that will most likely be location aware. I've found a couple of references to some LIBs for finding terminator, and I think a temperature curve could be defined based on optimum settings from day/dusk/night views to make the map readable for all (natural) lighting conditions. At least that's a place to start. Bobb -Original Message- From: mapserver-users-boun...@lists.osgeo.org [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Stephen Woodbridge Sent: Monday, March 03, 2014 10:46 AM To: mapserver-users@lists.osgeo.org Subject: Re: [mapserver-users] Color temperature control (night-time viewing of maps) On 3/3/2014 11:30 AM, Basques, Bob (CI-StPaul) 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. Bob, One simple way to deal with this is to have two mapfiles with different colors setup on them and then you a substitution to switch between the day and night mapfile. I wrote some code years ago that detects the day-night night terminator line in javascript to you can make the change. you need to know the browser location to compute this accurately. but a simple [day/night] toggle button would allow the user to switch manually. -Steve W ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Color temperature control (night-time viewing of maps)
On 3/3/2014 11:30 AM, Basques, Bob (CI-StPaul) 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. Bob, One simple way to deal with this is to have two mapfiles with different colors setup on them and then you a substitution to switch between the day and night mapfile. I wrote some code years ago that detects the day-night night terminator line in javascript to you can make the change. you need to know the browser location to compute this accurately. but a simple [day/night] toggle button would allow the user to switch manually. -Steve W ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
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)" 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 > http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
