gdalwarp using JPEG encoded GeoTiff produces artifacts in output file

[jnovak]

Reprojecting an EPSG:4326 JPEG encoded input file to EPSG:900913 JPEG encoded output file produces black horizontal banding in output file. The input file contains four overviews. The output files were viewed using GlobalMapper? v10.02.

GDAL 1.7.1 compiled from source on Ubuntu Karmic (9.10) using

./configure --with-python --with-libtiff=internal --with-libjpeg=internal --without-jasper

Defective output file created using

gdalwarp -co "COMPRESS=JPEG" -co "PHOTOMETRIC=YCBCR" -co "JPEG_QUALITY=85" -t_srs EPSG:900913

Using the commands

gdalwarp -t_srs EPSG:900913

gdal_translate -co "COMPRESS=JPEG" -co "PHOTOMETRIC=YCBCR" -co "JPEG_QUALITY=85"

produces an artifact free output file

The source files for this test are proprietary images; I can try to reproduce using other files if required.

[rouault]

There's quite strong reason to think this is a manifestation of #3458. This was fixed in trunk and in branches/1.7 as well by r19010 (this will go in 1.7.2). Could you try to apply this changeset and retry ? If still observing the artifact after applying the fix, please reopen

[jnovak]

Suggested fix applied and verified.