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

[Stephen Woodbridge]

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