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<p>Hi, you should read the documentation for this tool, as at least
four points are needed for a projective transformation.</p>
<p><a class="moz-txt-link-freetext" href="https://docs.qgis.org/3.16/en/docs/user_manual/working_with_raster/georeferencer.html">https://docs.qgis.org/3.16/en/docs/user_manual/working_with_raster/georeferencer.html</a></p>
<p>This is probably the reason for distortion, but if the original
is oblique, as implied by the use of the projective
transformation, it can be hard to mark points accurately.</p>
<p>Output quality depends on the resampling method chosen. It is
also of course affected by the original quality.</p>
<div class="moz-cite-prefix">On 31/01/22 06:35, Akanksha Chugh
wrote:<br>
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<blockquote type="cite"
cite="mid:CAA5o+ptC6AOkemiURSw1DLrMRETD0qhdgXrh1zD7gX6z+h=oAQ@mail.gmail.com">
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<div dir="auto">1.I clicked on Raster>Georeferencer
<div dir="auto">2. Open raster>Add points (X and Y)</div>
<div dir="auto">3. Open Transformation settings</div>
<div dir="auto">4. Define transformation type as projective,
resampling method as nearest neighbour, target SRS as
EPSG:4326- WGS 84, Compression as none and then ok.</div>
<div dir="auto">5. Start georeferencing. </div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Jan 30, 2022, 10:21 PM
Patrick Dunford <<a href="mailto:enzedrailmaps@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">enzedrailmaps@gmail.com</a>>
wrote:<br>
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.8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p>Ok. Can you give us a bit of detail of what you're trying
to do. List the steps that you undertook to get this
result.</p>
<p><br>
</p>
<p>There are a lot of possible factors that can cause
blurring, which includes the resolution of the source
raster, and the transformation method employed.</p>
<p>Assuming you're using aerial photography, there are
technical factors that can cause visual distortion of
distances.<br>
</p>
<div>On 31/01/22 02:10, Akanksha Chugh wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">Raster>Georeferencer</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Jan 30, 2022,
6:38 PM Patrick Dunford <<a
href="mailto:enzedrailmaps@gmail.com"
target="_blank" rel="noreferrer"
moz-do-not-send="true" class="moz-txt-link-freetext">enzedrailmaps@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Wjat
is the name of the tool or plugin you are using.<br>
<br>
On 31/01/22 01:25, Akanksha Chugh wrote:<br>
> There appears black area around the image and
also it is stretched out <br>
> and blurred.<br>
><br>
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