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<p>Same here, very different results</p>
<p><a class="moz-txt-link-freetext" href="https://drive.google.com/file/d/1GyIhYMWSdZFtI4uHQOLOyJpmcqDLrx4K/view?usp=sharing">https://drive.google.com/file/d/1GyIhYMWSdZFtI4uHQOLOyJpmcqDLrx4K/view?usp=sharing</a></p>
<p>I'am on 3.16.1, Window 10</p>
<p>Nicolas<br>
</p>
<div class="moz-cite-prefix">On 2020-12-01 1:58 p.m., Kirk Schmidt
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5ec4beb6-b113-b69a-75b1-3faf50d1fc74@nortekresources.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Hi Nicolas<br>
</p>
<p>I did the same and the legend indicates a change magnitude but
if I subtract the geopackage raster from the original, all
pixels equal zero.</p>
<p> Kirk<br>
</p>
<div class="moz-cite-prefix">On 12/1/2020 2:36 PM, Nicolas Cadieux
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ffcfec85-52a4-5348-bbec-ca4119398c04@gmail.com">
<p>Hi,</p>
<p>Tried this:<br>
</p>
<p>gdal_translate -of GPKG -b 1
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/test.gpkg</p>
<p>I read 4 band and still get data modifications.</p>
<p>Nicolas<br>
</p>
<div class="moz-cite-prefix">On 2020-12-01 1:28 p.m., Kirk
Schmidt wrote:<br>
</div>
<blockquote type="cite"
cite="mid:2a8cb288-13e4-17e2-a9f4-f5d38f5be283@nortekresources.com">
<p>Hi Nicolas:</p>
<p>try the -b 1 parameter. I just tried this and wrote a
single band raster from a 3 channel tiff.</p>
<p>Kirk<br>
</p>
<div class="moz-cite-prefix">On 12/1/2020 2:03 PM, Nicolas
Cadieux wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1e19158c-e195-f6e6-d839-8abb05739258@gmail.com">
<p>I tried <br>
</p>
<p>gdal_translate -of GPKG -co "BAND_COUNT=1"
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/TEST.gpkg for the creation and <br>
</p>
<p>C:\>gdal_translate -of GPKG -co "TILE_FORMAT = TIFF"
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/TEST.gpkg</p>
<p>Same problem. I wonder if we need to change the reading
options... <a class="moz-txt-link-freetext"
href="https://gdal.org/drivers/raster/gpkg.html"
moz-do-not-send="true">https://gdal.org/drivers/raster/gpkg.html</a></p>
<h2>"Opening options</h2>
<p>By default, the driver will expose a GeoPackage dataset
as a four band (Red,Green, Blue,Alpha) dataset, which
gives the maximum compatibility with the various encodings
of tiles that can be stored. It is possible to specify an
explicit number of bands with the BAND_COUNT opening
option."</p>
<p>The problem could be when QGIS Reads the file, not when
it writes the file. I explains why we see 4 bands but not
why values are changing. I would make a bug report or ask
the question on the gdal dev group to get Even Rouault's
attention.<br>
</p>
<p>Nicolas<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2020-12-01 12:17 p.m.,
Sebastian Gutwein wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAED_52pFuAzSH3UtyR6S4M_dKBJ60pU2Jx1+P0Be2EOEOkGv7g@mail.gmail.com">
<div dir="ltr">This looks like the same issue you are
having. <a
href="http://github.com/qgis/QGIS/issues/38227"
moz-do-not-send="true">github.com/qgis/QGIS/issues/38227</a>
<div>According to the documentation linked in the issue
you need to set the band count to 1 otherwise it
defaults to 4. </div>
<div><a href="http://gdal.org/drivers/raster/gpkg.html"
moz-do-not-send="true">gdal.org/drivers/raster/gpkg.html</a><br>
</div>
<div>I have not tried this to see if it works. </div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Tue, Dec 1, 2020 at
11:52 AM Nicolas Cadieux <<a
href="mailto:njacadieux.gitlab@gmail.com"
moz-do-not-send="true">njacadieux.gitlab@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote">
<div>
<p>Hi,<br>
</p>
<p>Looking at it now. I see what you see. I will
try a few things.</p>
<p>Nicolas<br>
</p>
<div>On 2020-12-01 11:42 a.m., Alberto Vavassori
wrote:<br>
</div>
<blockquote type="cite">
<div>
<p class="MsoNormal"><span>Hi Nicolas,</span></p>
<p class="MsoNormal"><span lang="EN-US">thank
you for the answer. I send the raster that I
am interested in.</span></p>
<p class="MsoNormal"><span lang="EN-US">Alberto</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<div>
<div>
<p class="MsoNormal"><b><span>Da:</span></b><span>
Nicolas Cadieux <a
href="mailto:njacadieux.gitlab@gmail.com"
target="_blank" moz-do-not-send="true"><njacadieux.gitlab@gmail.com></a>
<br>
<b>Inviato:</b> martedì 1 dicembre 2020
17:40<br>
<b>A:</b> Alberto Vavassori <a
href="mailto:alberto.vavassori@polimi.it"
target="_blank" moz-do-not-send="true"><alberto.vavassori@polimi.it></a><br>
<b>Cc:</b> <a
href="mailto:qgis-user@lists.osgeo.org"
target="_blank" moz-do-not-send="true">qgis-user@lists.osgeo.org</a><br>
<b>Oggetto:</b> Re: [Qgis-user]
Importing a raster into a Geopackage</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p>Hi,<span></span></p>
<p>Send a sample data set if you can't figure it
out.</p>
<p>Nicolas</p>
<div>
<p class="MsoNormal">On 2020-12-01 10:35 a.m.,
Nicolas Cadieux wrote:</p>
</div>
<blockquote>
<p class="MsoNormal">Hi, </p>
<div>
<p class="MsoNormal">Perhaps this can help: <a
href="https://gdal.orgdrivers/raster/gpkg.html" target="_blank"
moz-do-not-send="true">https://gdal.orgdrivers/raster/gpkg.html</a></p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p> <span>“Various kind of input datasets
can be converted to GeoPackage raster :</span></p>
<p> <span><span>·<span> </span></span></span><span>Single
band grey level</span></p>
<p> <span><span>·<span> </span></span></span><span>Single
band with R,G,B or R,G,B,A color table</span></p>
<p> <span><span>·<span> </span></span></span><span>Two
bands: first band with grey level,
second band with alpha channel</span></p>
<p> <span><span>·<span> </span></span></span><span>Three
bands: Red, Green, Blue</span></p>
<p> <span><span>·<span> </span></span></span><span>Four
band: Red, Green, Blue, Alpha</span></p>
<p> <span>GeoPackage rasters only support
Byte data type.”</span></p>
<p> <span>My guess is that if the original
raster does not correspond to one of the
categories above, it will be converted
to the closest format. </span></p>
</div>
<div>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">Nicolas Cadieux </p>
<div>
<p class="MsoNormal"><a
href="https://gitlab.com/njacadieux"
target="_blank"
moz-do-not-send="true">https://gitlab.com/njacadieux</a></p>
</div>
</div>
<div>
<p class="MsoNormal"><br>
<br>
</p>
<blockquote>
<p class="MsoNormal">Le 1 déc. 2020 à
09:58, Alberto Vavassori <a
href="mailto:alberto.vavassori@polimi.it"
target="_blank"
moz-do-not-send="true"><alberto.vavassori@polimi.it></a>
a écrit :</p>
</blockquote>
</div>
<blockquote>
<div>
<p class="MsoNormal"> <span></span></p>
<p class="MsoNormal"><span lang="EN-US">Hello
everybody. I have an issue regarding
the Geopackage format. I have tried
to import a singleband raster file
(it represents the land cover, thus
every pixel has a single integer
value corresponding to the land
cover class), but this operation
seems to modify the raster
characteristics: the raster becomes
a 4-bands raster and the pixels
values change accordingly
(basically, the original raster is
saved in the Geopackage as an RGB
image). It seems to be a bug of
QGIS. I have also tried to use GDAL
translate through the processing
toolbox of QGIS to convert the TIFF
file to a Geopackage file, but the
result is the same.</span></p>
<p class="MsoNormal"><span lang="EN-US">Has
anybody faced this problem? May
anybody suggest a way to work this
problem out?</span></p>
<p class="MsoNormal"><span lang="EN-US">Thank
you.</span></p>
<p class="MsoNormal"><span lang="EN-US">Alberto</span></p>
<p class="MsoNormal"><span>_______________________________________________<br>
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</blockquote>
<pre>-- </pre>
<pre>Nicolas Cadieux</pre>
<pre><a href="https://gitlab.com/njacadieux" target="_blank" moz-do-not-send="true">https://gitlab.com/njacadieux</a></pre>
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<pre class="moz-signature" cols="72">--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: <a class="moz-txt-link-abbreviated" href="mailto:kirk@nortekresources.com" moz-do-not-send="true">kirk@nortekresources.com</a>
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Nicolas Cadieux
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<pre class="moz-signature" cols="72">--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: <a class="moz-txt-link-abbreviated" href="mailto:kirk@nortekresources.com" moz-do-not-send="true">kirk@nortekresources.com</a>
Web: <a class="moz-txt-link-abbreviated" href="http://www.nortekresources.com" moz-do-not-send="true">www.nortekresources.com</a></pre>
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