[OSM-talk] A tile that just won't update

[Shaun McDonald]

On 31 Aug 2009, at 10:14, Jon Burgess wrote:

> 2009/8/31 Tom Chance <tom at acrewoods.net>:
>> There's a curious Mapnik problem in Peckham, London:
>>
>> http://www.openstreetmap.org/?mlat=51.47008&mlon=-0.06592&zoom=16&layers=B000FTF
>>
>> That industrial park has been split into two halves at that  
>> particular zoom
>> level - each with a different shade of purple - for months. Zoom in  
>> and it's
>> the newer, darker purple. There's no problem that I can see with  
>> the data, and
>> I've even made updates to the area which have forced the left hand,  
>> lighter
>> tile to be redrawn. But it's still split.
>>
>> Any ideas?
>
> That looks like an artefact of the colour reduction algorithm used to
> make the 256 colour PNG files. It is quite rare and I don't know how
> to fix it.
>

Tweaking of the colours will fix the problem. It requires a lot of  
experimentation.

Shaun