Paul Meems wrote:
We're using GDAL in MapWindow GIS and we're very happy about it.
Thanks for this great library.
Currently we have problems displaying png files representing only a few
lines.
The lines show up very stippled. Pixels are missing.
Reading this article, this seems 'by design':
http://n2.nabble.com/Change-Resampling-method-td3827881.html
This is not tolerable for us so we will try and make a custom method to
resample using lanscoz.
Before we dig in to this I want to know is others are working on this as
well and/or have some tips&tricks.
No need to reinvent the wheel again, right ;)
Paul,
There is a lanscoz resampler built into the GDAL warper, but I'm not
convinced this would be a good idea for general use by a display engine.
I'd suggest, in cases like this, to use RasterIO() to load a closer to
the underlying resolution and do the rest of the downsampling yourself
using lanscoz or other methods.
In a web mapping application built on MapServer using black and white
scanline linework drawings, we found just using averaging for downsamping
gave good results in preserving the linework in a sort of anti-aliased
fashion. So you might not need anything to fancy for the resampling.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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