[FWTools] gdalwarp issues

[Maksim Sestic]

Hi all,

I noticed funny behaviour of gdalwarp when slicing a window and resizing
such image using interpolation methods other than nearest neighbor.
Resulting image has remaining original artefacts along it's edges (1, 2 or 3
pixels wide, depending on resampling kernel size). Issuing a SOURCE_EXTRA
warp option with appropriate value (see above) resolves the issue, but only
if there's no mosaicking taking place. Otherwise, artefacts appear along the
stitched edge so it takes two steps to fix this (mosaicking selected window
first, then resizing/resampling). Is it possible for gdalwarp to
automatically fix this when resizing a window, saving us an extra step?

Regards,
Maksim Sestic
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