[Tilesathome] Wrong colors in some tiles

[Dirk Stöcker]

On Fri, 24 Oct 2008, Matthias Julius wrote:

>> Now one could say this is an effect of the color reduction, but when I
>> look into the image, then I find multiple color entries with the same value, so
>> there must be an error somwhere in the processing chain which should be
>> found and fixed.
>
> You are probably right and if it is a bug it is probably in pngnq.

Then it is a major bug. I would agree that in certain situations the 
colors may change, but when I find multiple entries with exact same color 
in the PNG file, then there is a real bug. Because there is no sense in 
modifying colors when the table is not yet fully used.

> I have plans and a partial implementation to use a color quantization
> algorithm that ensures that all colors that are defined in the
> osmarender styles and symbols remain unchanged.

How did you implement this? In pngnq? Because something like a "Don't try 
to modify following colors" option would not only be a useful idea for 
t at h.

Ciao
-- 
http://www.dstoecker.eu/ (PGP key available)