3d-gradients of sky

[Thomas Steiner]

When I shoot my panos and I stitch them with hugin, there are
sometimes some little "holes" at the border of the panorama, often in
the sky (or at the ground). I then just copy (in gimp) the sky around
it, shift and paste it. This looks ok, but not good; it would be
better to make a "simple" 3d gradient fixing say four points where I
know the colour of the sky and then the missing part is filled.
In the attached panorama example it is visible that I did the
copy&paste at the top left of the statue.
My question: how do you guys handle this problem?
If it is not a hugin related question and thus not to be discussed
here, please let me know as well.
Thanks
Thomas

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[sebastien delcoigne]

Better than copy/paste you might want to try the clone tool with one of the "fuzzy circle" brush that suits your needs (create one if needed). Then maybe the heal tool if you are not entirely happy with the result.

--
Sébastien

On Mon, Jun 22, 2009 at 10:18 AM, Thomas Steiner <finbref.2006@...> wrote:

When I shoot my panos and I stitch them with hugin, there are
sometimes some little "holes" at the border of the panorama, often in
the sky (or at the ground). I then just copy (in gimp) the sky around
it, shift and paste it. This looks ok, but not good; it would be
better to make a "simple" 3d gradient fixing say four points where I
know the colour of the sky and then the missing part is filled.
In the attached panorama example it is visible that I did the
copy&paste at the top left of the statue.
My question: how do you guys handle this problem?
If it is not a hugin related question and thus not to be discussed
here, please let me know as well.
Thanks
Thomas

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[Seb Perez-D-2]

> On Mon, Jun 22, 2009 at 10:18 AM, Thomas Steiner <finbref.2006@...>
> wrote:
>>
>> When I shoot my panos and I stitch them with hugin, there are
>> sometimes some little "holes" at the border of the panorama, often in
>> the sky (or at the ground). I then just copy (in gimp) the sky around
>> it, shift and paste it. This looks ok, but not good; it would be
>> better to make a "simple" 3d gradient fixing say four points where I
>> know the colour of the sky and then the missing part is filled.
>> In the attached panorama example it is visible that I did the
>> copy&paste at the top left of the statue.
>> My question: how do you guys handle this problem?
>> If it is not a hugin related question and thus not to be discussed
>> here, please let me know as well.

Sometimes the resynthetize plugin (for Gimp) works wonders. This might
be one of these cases.

Cheers,

Seb

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[RizThon]

There has already been a message about this, you can look for "[hugin-ptx] adding missing sky" http://www.mail-archive.com/hugin-ptx@.../msg02390.html
I also tried using the "Liquid Rescale GIMP plugin". It works pretty well, I just had memory issues...I don't know if it's because of my PC or the plugin or Gimp. You can have a look at this discussion about missing sky here http://liquidrescale.wikidot.com/forum/t-106572/filling-panorama-picture-stitching

On Mon, Jun 22, 2009 at 10:29, Seb Perez-D <sbprzd@...> wrote:

> On Mon, Jun 22, 2009 at 10:18 AM, Thomas Steiner <finbref.2006@...>
> wrote:
>>
>> When I shoot my panos and I stitch them with hugin, there are
>> sometimes some little "holes" at the border of the panorama, often in
>> the sky (or at the ground). I then just copy (in gimp) the sky around
>> it, shift and paste it. This looks ok, but not good; it would be
>> better to make a "simple" 3d gradient fixing say four points where I
>> know the colour of the sky and then the missing part is filled.
>> In the attached panorama example it is visible that I did the
>> copy&paste at the top left of the statue.
>> My question: how do you guys handle this problem?
>> If it is not a hugin related question and thus not to be discussed
>> here, please let me know as well.

Sometimes the resynthetize plugin (for Gimp) works wonders. This might
be one of these cases.

Cheers,

Seb

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[Carl von Einem-2]

Looking at your example I would suggest shooting two rows (in portrait
orientation) to achieve more vertical fov: one row tilted up so the
bottom part of the images still shows details at horizon level, a second
row tilted down with enough overlap so that a CP-generator can link both
rows.
That way you get rid of the sky problem (enough canvas to crop those
missing parts that you'll always get with partial panoramas) and also
will see the complete statue :-)

Carl

Thomas Steiner wrote:

> When I shoot my panos and I stitch them with hugin, there are
> sometimes some little "holes" at the border of the panorama, often in
> the sky (or at the ground). I then just copy (in gimp) the sky around
> it, shift and paste it. This looks ok, but not good; it would be
> better to make a "simple" 3d gradient fixing say four points where I
> know the colour of the sky and then the missing part is filled.
> In the attached panorama example it is visible that I did the
> copy&paste at the top left of the statue.
> My question: how do you guys handle this problem?
> If it is not a hugin related question and thus not to be discussed
> here, please let me know as well.

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[Klaus Foehl]

Hi Thomas,

While gimp is wonderful, duplicate the relevant input photo(s), then
misalign them in hugin to cover your corner and then crop them as
required in the crop tab so they only contribute sky. In this way, if
there is a linear gradient only, exposure correction will adjust and
then enblend can do its magic. Play around, check how much or how
little overlap is required with the correcly aligned image area. It
does work often, but not always.

Cheers
Klaus
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[voschix]

I use still another method in GIMP. I cut and paste as new layer a
rectangular section that touches the border of the image and includes
the missing bit (of sky, for example). I apply a suitable deformation
to one (and only one!) side of the new layer using the "curve bend"
filter. Then move the new layer in the correct position. Zooming in
when moving helps aligning the new and the base layer). Merge the
layers.

Volker

On Jun 22, 10:18 am, Thomas Steiner <finbref.2...@...> wrote:

> When I shoot my panos and I stitch them with hugin, there are
> sometimes some little "holes" at the border of the panorama, often in
> the sky (or at the ground). I then just copy (in gimp) the sky around
> it, shift and paste it. This looks ok, but not good; it would be
> better to make a "simple" 3d gradient fixing say four points where I
> know the colour of the sky and then the missing part is filled.
> In the attached panorama example it is visible that I did the
> copy&paste at the top left of the statue.
> My question: how do you guys handle this problem?
> If it is not a hugin related question and thus not to be discussed
> here, please let me know as well.
> Thanks
> Thomas
>
>  IMG_2091-IMG_2112m.jpg
> 109KViewDownload

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