[Mapnik-users] Turning off anti-aliasing

[Dane Springmeyer]

Okay, done in r2558, see: https://trac.mapnik.org/ticket/689

Dane

On Jan 6, 2011, at 2:32 AM, Aurelien Bricier wrote:

> My use case is to produce georeferenced binary masks from shapefiles using mapnik rasterization capabilities in a library where it is already used to perform classic map rendering.
> I know that this context is anecdotal but an access to this level of rendering parametrization should be interesting.
> 
> I created a feature request ticket, thanks for your answers!
> 
> Regards,
> Aurelien.
> 
> Dane Springmeyer a écrit :
>> On Jan 5, 2011, at 3:57 PM, Colin Marquardt wrote:
>> 
>>  
>>> 2011/1/5 Dane Springmeyer <dane at dbsgeo.com>:
>>>    
>>>> Also, would be great to know more about your usecase - why no antialiasing?
>>>>      
>>> I don't know Aurelien's use case, but I could imagine using this for a
>>> contour line overlay where it might be quicker to patch the headers of
>>> PNG files instead of re-rendering the tiles if you just want to change
>>> the line color. Due to mix colors, this wouldn't work well with
>>> antialiasing.
>>> Actually, you might use that to filter out, say, 20-meter contours out
>>> of tiles showing both 20-meter and 100-meter contours (if the two line
>>> types use distinct colors). Admittely, this a bit of a constructed
>>> case :)
>>>    
>> 
>> Ya, it was re-classing of polygons (based on color) which was one of the reasons I added gamma to the polygon symbolizers.
>> 
>>  
>>> Cheers
>>> Colin
>>>    
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