My big fear this weekend was I was doing something wrong. I used your
example and now it's not crashing on me. I had it -co 'TILED=YES' - I
just mistyped in the email. I need to update some notes on my end now to
make sure I do this right from here on out.
Andreas and list - I thank you.
Randy
On 05/08/2017 09:46 AM, Neumann, Andreas wrote:
Hi Randal,
A crash is always a bug, in my opinion, even if your file isn't
optimized.
Note, that the correct parameter is "tiled=yes" not "tiles=yes". Not
sure if this helps.
Fyi - here is one of my examples with gdal_warp:
gdalwarp -of GTiff -wm 500 --config GDAL_CACHEMAX 500 -multi -wo
NUM_THREADS=2 -wo OPTIMIZE_SIZE=TRUE -srcnodata "255 255 255"
-dstnodata '255 255 255' -t_srs 'EPSG:2056' -co 'BIGTIFF=YES' -co
'TILED=YES' -co 'COMPRESS=JPEG' -co 'JPEG_QUALITY=85' -co
'PHOTOMETRIC=YCBCR' -co 'SPARSE_OK=TRUE' Originaldaten/*.tif
DOP2011_LV95.tif
the PHOTOMETRIC=YCBCR is specifically to be used for aerial images or
satellite images.
Of course, for good performance, you also need the pyramids:
gdaladdo -r cubic --config BIGTIFF_OVERVIEW YES --config
COMPRESS_OVERVIEW JPEG --config JPEG_QUALITY 85 --config
PHOTOMETRIC_OVERVIEW YCBCR --config INTERLEAVE_OVERVIEW PIXEL
DOP2016_LV95.tif 2 4 8 16 32 64 128 256
Hope this helps,
Andreas
On 2017-05-08 15:29, Randal Hale wrote:
* QGIS: 2.18.7
* GDAL 2.1.3
I have a tiff file. I decided to jpeg compress it for some help with
the size.
I did: gdal_translate -co compress=jpeg -co tiles=yes oldfile.tif
newfile_jpg.tif
When I open the file in QGIS (2.18.7) on linux it crashes immediately.
When opened on windows if the file is small it takes about a minute
but displays. If I compress a larger tiff (compressed size is 1.1 gb)
QGIS on windows crashes.
I checked for bugs and there seems to be a jpeg bug out there:
https://issues.qgis.org/issues/16049
If I do this with compress=deflate, QGIS is happy.
Anyway - file a bug report? or I'm doing the compression incorrectly?
Randy
--
-----------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611rjh...@northrivergeographic.com
twitter:rjhale
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-----------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjh...@northrivergeographic.com
twitter:rjhale
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