Hi Frederik, Matt

Sorry for taking a long time to rely. Mapnik has image scaling  
implementation internally :

ImageData32 source(100,100);
ImageData32 target(200,120);
scale_image<ImageData32>(target,source); // stretch source to fit taget

It doesn't use any filtering and visual quality can be sub-optimal but  
it is fast.
For better results I recommend AGG based implementation or  
boost::gil .  I have code somewhere which I happy to share.

Cheers
Artem

> Hi,
>
>> Ok, this will show me to actually try code before telling people  
>> how to do it.
> [...]
>
> Thanks for your work, I don't think I would have found that out from  
> the
> docs alone. I'll give it a try. I have a working dolution that doubles
> or drops individual scanlines from the PNG to stretch/shrink it but of
> course the image quality is suboptimal, CImg would do better.
>
> Bye
> Frederik
>
> -- 
> Frederik Ramm  ##  eMail [EMAIL PROTECTED]  ##  N49°00'09"  
> E008°23'33"
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