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

[Norman Vine]

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> 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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