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<p>Hi Sebastian and others,</p>
<p>I think the github has it wrong here According to the
documentation, the band count option is for <u>reading</u> the
file and not creating the file. What I don't get is the fact that
the data is being changed significantly (but not as much as when
the "rendered image" option is selected (as expected) so that's
not the problem here). I tried QUALITY = 100 for writing to see
if some compression was going on but it's the same problem. Looks
like some scaling issues. The 1 to 4 band is not a problem (as
this is the standard read option) but the value changes are.<br>
</p>
<p>gdal_translate -of GPKG -co "QUALITY = 100"
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/TEST.gpkg</p>
<p>Nicolas<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">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<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" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<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 style="font-size:12pt">Hi
Nicolas,</span></p>
<p class="MsoNormal"><span style="font-size:12pt"
lang="EN-US">thank you for the answer. I send the
raster that I am interested in.</span></p>
<p class="MsoNormal"><span style="font-size:12pt"
lang="EN-US">Alberto</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<div>
<div
style="border-right:none;border-bottom:none;border-left:none;border-top:1pt
solid rgb(225,225,225);padding:3pt 0cm 0cm">
<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 style="margin-top:5pt;margin-bottom:5pt">
<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
style="margin-right:0cm;margin-bottom:18pt;margin-left:0cm;line-height:18pt;box-sizing:border-box">
<span
style="font-size:12pt;font-family:Arial,sans-serif;color:rgb(64,64,64)">“Various
kind of input datasets can be converted to
GeoPackage raster :</span></p>
<p
style="margin-right:0cm;margin-bottom:0cm;margin-left:54pt;line-height:18pt;box-sizing:border-box">
<span
style="font-size:10pt;font-family:Symbol;color:rgb(64,64,64)"><span>·<span
style="font:7pt "Times New Roman"">
</span></span></span><span
style="font-size:12pt;font-family:Arial,sans-serif;color:rgb(64,64,64)">Single
band grey level</span></p>
<p
style="margin-right:0cm;margin-bottom:0cm;margin-left:54pt;line-height:18pt;box-sizing:border-box">
<span
style="font-size:10pt;font-family:Symbol;color:rgb(64,64,64)"><span>·<span
style="font:7pt "Times New Roman"">
</span></span></span><span
style="font-size:12pt;font-family:Arial,sans-serif;color:rgb(64,64,64)">Single
band with R,G,B or R,G,B,A color table</span></p>
<p
style="margin-right:0cm;margin-bottom:0cm;margin-left:54pt;line-height:18pt;box-sizing:border-box">
<span
style="font-size:10pt;font-family:Symbol;color:rgb(64,64,64)"><span>·<span
style="font:7pt "Times New Roman"">
</span></span></span><span
style="font-size:12pt;font-family:Arial,sans-serif;color:rgb(64,64,64)">Two
bands: first band with grey level, second band
with alpha channel</span></p>
<p
style="margin-right:0cm;margin-bottom:0cm;margin-left:54pt;line-height:18pt;box-sizing:border-box">
<span
style="font-size:10pt;font-family:Symbol;color:rgb(64,64,64)"><span>·<span
style="font:7pt "Times New Roman"">
</span></span></span><span
style="font-size:12pt;font-family:Arial,sans-serif;color:rgb(64,64,64)">Three
bands: Red, Green, Blue</span></p>
<p
style="margin-right:0cm;margin-bottom:0cm;margin-left:54pt;line-height:18pt;box-sizing:border-box">
<span
style="font-size:10pt;font-family:Symbol;color:rgb(64,64,64)"><span>·<span
style="font:7pt "Times New Roman"">
</span></span></span><span
style="font-size:12pt;font-family:Arial,sans-serif;color:rgb(64,64,64)">Four
band: Red, Green, Blue, Alpha</span></p>
<p
style="margin-right:0cm;margin-bottom:18pt;margin-left:0cm;line-height:18pt;box-sizing:border-box">
<span
style="font-size:12pt;font-family:Arial,sans-serif;color:rgb(64,64,64)">GeoPackage
rasters only support Byte data type.”</span></p>
<p
style="margin-right:0cm;margin-bottom:18pt;margin-left:0cm;line-height:18pt;box-sizing:border-box">
<span
style="font-size:12pt;font-family:Arial,sans-serif;color:rgb(64,64,64)">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
style="margin-top:5pt;margin-bottom:5pt">
<p class="MsoNormal" style="margin-bottom:12pt">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 style="margin-top:5pt;margin-bottom:5pt">
<div>
<p class="MsoNormal"> <span></span></p>
<p class="MsoNormal"><span
style="font-size:12pt" 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
style="font-size:12pt" lang="EN-US">Has
anybody faced this problem? May anybody
suggest a way to work this problem out?</span></p>
<p class="MsoNormal"><span
style="font-size:12pt" lang="EN-US">Thank
you.</span></p>
<p class="MsoNormal"><span
style="font-size:12pt" lang="EN-US">Alberto</span></p>
<p class="MsoNormal"><span>_______________________________________________<br>
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</blockquote>
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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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</blockquote>
<pre cols="72">--
Nicolas Cadieux
<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">--
Nicolas Cadieux
<a class="moz-txt-link-freetext" href="https://gitlab.com/njacadieux">https://gitlab.com/njacadieux</a></pre>
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