[mapserver-users] Color temperature control (night-time viewing of maps)

[Basques, Bob (CI-StPaul)]

Norman,

I would imagine there is a similar blackout event for folks in airplanes (pilots) as well.

Bobb


From: Norman Vine [mailto:nhv at cape.com]
Sent: Monday, March 03, 2014 11:10 AM
To: Basques, Bob (CI-StPaul)
Cc: mapserver-users at 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.basques at ci.stpaul.mn.us<mailto:bob.basques at 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:nhv at cape.com<http://cape.com>]
Sent: Monday, March 03, 2014 10:40 AM
To: Basques, Bob (CI-StPaul)
Cc: mapserver-users at lists.osgeo.org<mailto:mapserver-users at 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.basques at ci.stpaul.mn.us<mailto:bob.basques at 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


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