Hi All,
I need your wisdom. I'm downloading NAIP DOQQs in GTiff format and I
have a processing chain something like the following:
gdalwarp -t_srs EPSG:4326 -dstalpha -r "bilinear -multi -co TILED=YES
-dstnodata '0 0 0' srctiff tmpfile
nearblack -nb 15 -q tmpfile
gdal_translate -co TILED=YES -co JPEG_QUALITY=90 -co COMPRESS=JPEG -co
PHOTOMETRIC=YCBCR -b 1 -b 2 -b 3 -mask auto --config
GDAL_TIFF_INTERNAL_MASK YES tmpfile, target
nearblack -nb 5 -q target
gdaladdo -clean -r bilinear target 2 4 8 16 32 64 128 512
And create a tileindex for mapserver of all the tiffs
If I skip the gdal_translate (ie: JPEG compression) and the 2nd
nearblack, the doqq tiles are perfect with no nearblack edges between
the doqq tiles. But when a JPEG compress them, I get edges between the
doqqs like this:
http://imaptools.com:8080/dl/doqq-issue.jpg
I've never used the JPEG in tiff compression and I'm very impressed by
the amount of size reduction there and how good the image remains, but I
have not been able to figure out the magic trick to clearing the edge
artifacts.
Any help would be appreciated.
Thanks,
-Steve
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