[Qgis-user] Tiff with jpeg compression

[Neumann, Andreas]

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
> 423.653.3611 rjhale at northrivergeographic.com
> twitter:rjhale
> 
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