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<p>Hi Krishna,</p>
<p>It's hard to say what might be happening without seeing the data,
but the issues with the union output may be due to invalid
geometries being created by the polygonise. Check that the
polygonise outputs are correctly capturing the band values and run
them through the 'Check validity' tool.</p>
<p>If there are a lot of invalid polygons, then it will probably be
easier to follow a raster approach such as outlined by Nicolas
Cadieux, ie Raster Calculator: R * 1000000 + G * 1000 + B,
followed by polygonise and then use an expression to extract the
colour components again to colour the polygons.<br>
</p>
<p>Cheers,</p>
<p>Andy<br>
</p>
<div class="moz-cite-prefix">On 19/07/2021 21:09, krishna Ayyala
wrote:<br>
</div>
<blockquote type="cite" cite="mid:CADUrCAjkujFmG-AsJM7Yq2+dD9AwhbmhWx=VVODcLCiNREUaDg@mail.gmail.com">
<div style="padding-bottom: 10px; padding-top: 5px;">
<div style="padding:12px; border:1px solid #8D3970;
background-color:#F7F9FA; color:#8D3970; font-size:14px;
line-height:22px; font-family: Calibri, Arial, Helvetica,
sans-serif;">
<strong>CAUTION:</strong> This e-mail originated outside the
University of Southampton.
</div>
</div>
<div>
<div dir="ltr">
<div dir="ltr"><font color="#0000ff">Dear Andy,</font>
<div><font color="#0000ff">Thanks for your reply. I did
extract the image into three separate vectors using the
Polygonize (Raster to vector) tool. I got three vector
files which I named as Band1, Band2 and Band3. I did the
union of Band1 and Band2 the result of which I named as
"Band1_and_Band2". Again ran union tool with
"Band1_and_Band2" and Band3. I named the result as
Band1_and_Band2_and_Band3". This resultant vector file
is not showing the entire area of the image. It is
showing only part of the image. Lot of DN values for
each band show null values.</font></div>
<div><font color="#0000ff"><br>
</font></div>
<div><font color="#0000ff">Regards.</font></div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Jul 19, 2021 at
7:40 AM Andy Harfoot <<a href="mailto:ajph@geodata.soton.ac.uk" moz-do-not-send="true">ajph@geodata.soton.ac.uk</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>Or extract the three bands into three separate vector
files and then union the three together to get the
unique combinations of RGB values.</p>
<p>Cheers,</p>
<p>Andy<br>
</p>
<div>On 18/07/2021 19:56, Nicolas Cadieux wrote:<br>
</div>
<blockquote type="cite">
<div style="padding-bottom:10px;padding-top:5px">
<div style="padding:12px;border:1px solid
rgb(141,57,112);background-color:rgb(247,249,250);color:rgb(141,57,112);font-size:14px;line-height:22px;font-family:Calibri,Arial,Helvetica,sans-serif"><strong>CAUTION:</strong>
This e-mail originated outside the University of
Southampton.
</div>
</div>
<div>Hi,
<div>You could create a style that could apply to
both raster and vector layers but that would not
help much here. The problem is that you need to
create the vector based on one of the raster Bands
and not all three. One way could be to combine
all three fields into one. If your RGB is 155 025
255, make this a raster band with 155025255. Then,
I guess you could use that 4th band to make the
vector layer, then resplit the data into 3 fields
and use that to create the colour profile.<br>
<br>
<div dir="ltr">Nicolas Cadieux
<div><a href="https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.com%2Fnjacadieux&data=04%7C01%7Cajph%40geodata.soton.ac.uk%7C726a39561c5d442ecdba08d94af134d3%7C4a5378f929f44d3ebe89669d03ada9d8%7C0%7C0%7C637623222094924014%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=fAzESIlmgUW0MGxRs99ZXaj9jDFTjwuQx0wTmKKTudk%3D&reserved=0" originalsrc="https://gitlab.com/njacadieux" shash="pHOR7GlmVvPuTy9tUkVkXrEA4ltgpecRlNkcut2n5XHJgO+B1mnzQVJGTigVQO4undZXN8NENaZWFbZMZ/gojvhASANqavkii7glTKT7XwnAY5EQBwr+/zYx8vzTi2ShPF6r8/Ld+Ln0/UUf8tjuUvDNvyYuxttwYD06lcIMGS0=" target="_blank" moz-do-not-send="true">https://gitlab.com/njacadieux</a></div>
</div>
<div dir="ltr"><br>
<blockquote type="cite">Le 18 juill. 2021 à
12:51, krishna Ayyala <a href="mailto:ayyalakrishna@gmail.com" target="_blank" moz-do-not-send="true">
<ayyalakrishna@gmail.com></a> a
écrit :<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div><font color="#0000ff">I have an image
on my qgis map that has 3 bands. Band1
(red), Band2(green) and Band3(blue).
This image has different colors.Is it
possible to convert this image into a
vector which should look exactly like
the image. </font></div>
<div><font color="#0000ff"><br>
</font></div>
<div><font color="#0000ff">That means; Is it
possible to have the vector file that
should have the same colors as that of
the image.</font></div>
<div><font color="#0000ff"><br>
</font></div>
<div><font color="#0000ff">Regards.</font></div>
</div>
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<pre cols="72">--
Andy Harfoot
Skype: gdi_ajph
Teams: <a href="mailto:ajph@soton.ac.uk" target="_blank" moz-do-not-send="true">ajph@soton.ac.uk</a>
GeoData Institute
University of Southampton
Southampton
SO17 1BJ
<a href="http://www.geodata.soton.ac.uk" target="_blank" moz-do-not-send="true">www.geodata.soton.ac.uk</a></pre>
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<pre class="moz-signature" cols="72">--
Andy Harfoot
Skype: gdi_ajph
Teams: <a class="moz-txt-link-abbreviated" href="mailto:ajph@soton.ac.uk">ajph@soton.ac.uk</a>
GeoData Institute
University of Southampton
Southampton
SO17 1BJ
<a class="moz-txt-link-abbreviated" href="http://www.geodata.soton.ac.uk">www.geodata.soton.ac.uk</a></pre>
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