[scribus] Differentiating colors for a map

[JLuc]

Le 27/09/2010 15:52, John Culleton a écrit :
> On Monday 27 September 2010 04:06:01 JLuc wrote:
>> Hello,
>>
>> this is not a scribus question but a "visual impact" one
>> &  i hope to get some qualified answers on this list.
>>
>> I am looking for the best continuous colour set for a map,
>> so that each point in the map has a different color
>> and coulour is evenly mapped.
>> That is : no colour should appear to use more place than other,
>> and no colour should appear to use less place than other.
>> The aim is to be as exact as possible when trying to find a place
>> on the map, having only its colour place :
>> the best map will be the most differentiating (discriminating).
>>
>> As far as now, i use a continuous chromatic circle as a starting
>> point you can find it here
>> http://passerelleco.info/IMG/disque_chromatique.jpg I stretch it so
>> as to fit the whole map.
>> It is not too bad however not as good as I wish now since :
>> - there seem to be some whitish areas
>> - colors are not evenly set :
>> -* too much pink, too much light blue and light green
>> 	leading to a large not differentiating areas
>> -* not enough yellow, orange and red, no dark green
>> 	leading to a loss of discrimination abilities
>>
>> There might be an ideal mathematical known solution for this
>> request, or maybe the eye's reality is not mathematical and follow
>> its own rules, but then there are empirical solutions.
>>
>> Could anybody share his views on this question ?
>> Are there known background images that fit this need ?


> A little known but apparently true fact. Any map can be designed using
> only four colors.
Thanks for the remembering : i used to play such games
in previous Jeux et Stratégie magazines
but this is NOT the matter here :

Here is why :

This will be used for the announcement pages in a magazine.
Each announcement will have a colour bullet on its left margin
(same as element in a HTML list <ul><li>...)

The colour of the bullet will be the colour of the place on the map.
The matter is to be able to spot WHERE the place is on the map,
knowing only the colour of the bullet, and this :
as exactly as possible.

To achieve the best visual differenciation,
the map requires to be as evenly continuous as possible
(as in a rainbow, not as in a material painter's palette
or in the 4 coulour mapping issue)
and as differenciating (discriminating) as possible.

JLuc