Hi Krishna,
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.
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.
Cheers,
Andy
On 19/07/2021 21:09, krishna Ayyala wrote:
*CAUTION:* This e-mail originated outside the University of Southampton.
Dear Andy,
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.
Regards.
On Mon, Jul 19, 2021 at 7:40 AM Andy Harfoot <a...@geodata.soton.ac.uk
<mailto:a...@geodata.soton.ac.uk>> wrote:
Or extract the three bands into three separate vector files and
then union the three together to get the unique combinations of
RGB values.
Cheers,
Andy
On 18/07/2021 19:56, Nicolas Cadieux wrote:
*CAUTION:* This e-mail originated outside the University of
Southampton.
Hi,
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.
Nicolas Cadieux
https://gitlab.com/njacadieux
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Le 18 juill. 2021 à 12:51, krishna Ayyala
<ayyalakris...@gmail.com> <mailto:ayyalakris...@gmail.com> a écrit :
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.
That means; Is it possible to have the vector file that
should have the same colors as that of the image.
Regards.
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