Hi all.
I am processing images by GDAL (warp, then gdaladdo) to geotiff with alpha
channel. When are images drawn by StreamingRenderer there are 2 problems:
1] I think that for rendering should be used overview with resolution
better than result resolution - if exist. But it seems that overview with
nearest resolution (even worse than result) is sometimes used. Is this
problem solved here:
http://www.nabble.com/VALUE_OVERVIEW_POLICY-in-Hints-td14516886.html ? Is
there any workaround for GT 2.3.X?
2] I have images with white background - so also edge pixels are white.
After gdalwarp there is fully transparent space around original image.
Also overviews have fully white borders (I checked it by viewer). But
after rendering there is gray border. It seems that interpolation takes in
account also pixels which are transparent (and have black RGB value). When
zoom is big enough to use original file then gray border disappear. Is
there possibility to choose kind of interpolation? Are used different
algorithms for overviews and original image? Setting hints for
StreamingRenderer doesn't help.
Thank you in advance!
Best regards
Jaroslav Kubos
--------------------------------------------------------------
Ing. Jaroslav Kubos
Amberg Engineering a.s.
Ptasinskeho 10
602 00 Brno
Czech Republic
Phone: +420 541 432 659
Email: [EMAIL PROTECTED]
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