[gdal-dev] gdaladdo pyramids with incorrect NULL values

[Andreas Oxenstierna]

Hi list

We have an issue were the pyramids as created by gdaladdo is not 
correctly handling NULL values

Create a 3 band tiff with proper null values (0 is null) - see 
https://www.dropbox.com/s/99rq1zflnuwah20/correctnulls.png?dl=0
   gdalwarp -r cubic -s_srs epsg:32633 -srcnodata 0 -dstnodata 0 -t_srs 
epsg:3857 -multi -wm 1000 -overwrite -co TILED=YES -co COMPRESS=DEFLATE 
input.tif output.tif

Adding pyramids with either JPEG or Deflate compression results in non-0 
values - see 
https://www.dropbox.com/s/24jk0rsznme5s3h/pyramid_faultynulls.png?dl=0
gdaladdo -r cubic --config COMPRESS_OVERVIEW JPEG --config 
JPEG_QUALITY_OVERVIEW 75 --config INTERLEAVE_OVERVIEW PIXEL --config 
PHOTOMETRIC_OVERVIEW YCBCR  LFC_output.tif 2 5 6 12 25 62 125 250 500
or
gdaladdo -r cubic --config COMPRESS_OVERVIEW DEFLATE output.tif 2 5 6 12 
25 62 125 250 500

What are we missing?


-- 
Best regards

Andreas Oxenstierna
T-Kartor Geospatial AB
mobile: +46 733 206831
mailto: ao at t-kartor.se
http://www.t-kartor.com