steve and all after reading my reply I noticed a major error
"first, if your data is non lossy you need to nearblack -nb 0 -near 15" this should read "nearblack -nb 0 -near 0" Brian On Sun, 2017-02-12 at 13:16 -0800, Brian Case wrote: > Steve, > > first, if your data is non lossy you need to nearblack -nb 0 -near 15 > > however your DOQQ's dont have a collar so there is no reason to > nearblack > > gdalwarp -dstalpha will crate an alpha band to mask out the collar after > gdalwarp rotates the image. no nead to nearblack the output of gdal > warp. > > when using gdal_translate to create a tiff with a mask band, and you > warped file has a alpha band, gdal_translate -b 1 -b 2 -b 3 -mask 4 > this will crate a mask band from the alpha band > > brian > > On Sat, 2017-02-11 at 18:18 -0500, Stephen Woodbridge wrote: > > 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 > > > > --- > > This email has been checked for viruses by Avast antivirus software. > > https://www.avast.com/antivirus > > > > _______________________________________________ > > gdal-dev mailing list > > gdal-dev@lists.osgeo.org > > https://lists.osgeo.org/mailman/listinfo/gdal-dev > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
