[Qgis-user] Tiff with jpeg compression

[Randal Hale]

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
>> 423.653.3611rjhale at northrivergeographic.com
>> twitter:rjhale
>>
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-- 
-----------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjhale at northrivergeographic.com
twitter:rjhale

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