For development of a Free gui for Panorama Tools

Calvin McDonald | 10 Jun 2012 02:32

Help My Skies

I seldom have trouble with the ski in my panos but occasionally when I have many moving high contrast clouds against a blue sky it gives me grief. An example image is attached. These types of artifacts I haven't figured out how to avoid in Hugin and they exceed my touch-up ability in PS.

Can someone give me some pointers how to deal with skies like this?

Thanks

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Carlos Eduardo G. Carvalho (Cartola | 11 Jun 2012 13:40

Re: Help My Skies

Hi Calvin,

I have already had problems like that too. I think you can try some different approaches to solve it.

1. Using masks
Well, I believe you have already done that as I think your are not a beginner.

2. Reuse images
You can try to repeat some images to use only its sky parts. The secret is to choose sky parts similar to those where you want to fill, as the problem is the clouds movement, making them too much different from pic to pic.

3. Improve your editing skills on PS
Well, I use GIMP, but you probably will find similar functionalities in PS. What I do in general:
3.1. Select an origin with free selection tool, feather the selection, copy, paste, make the paste selection a new layer, position, rotate and to finish erase undesired parts. I did it three times on the attached picture to illustrate. It needs some patience, but it gets faster when you get experienced.
3.2. Use clone tool to copy from one part to another. Use healing tool to smooth bad joinings.
3.3. In places where the blue is not smooth, make a selection with free selection tool, feather the selection by a great pixel amount, blur the selection. This I did many times on this picture. A similar result can be achieved with healing tool, but the selection allows you to work in a bigger area.

Cheers,

Carlos E G Carvalho (Cartola)
http://cartola.org/360
http://cartola.org/panoforum

2012/6/9 Calvin McDonald <ck1 <at> ckmcdonald.com>

I seldom have trouble with the ski in my panos but occasionally when I have many moving high contrast clouds against a blue sky it gives me grief. An example image is attached. These types of artifacts I haven't figured out how to avoid in Hugin and they exceed my touch-up ability in PS.

Can someone give me some pointers how to deal with skies like this?

Thanks

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A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ
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Calvin McDonald | 11 Jun 2012 16:42

Re: Help My Skies

Carlos:

Thanks so much for taking the time to respond. Your tips will help me out.

I do play with masking a bit but I wouldn't call it methodical at all. I kind of do a hit-and-miss approach as I have little skill at it. Occasionally I generate improvement with masks but usually not. I haven't tried using other images. I'll give that a try. My PS skills improve with every pano I make. However, I have a long way to go to fully use the capability of the tool. Thanks for the image editing pointers - they will help.

Calvin

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Carlos Eduardo G. Carvalho (Cartola | 11 Jun 2012 16:52

Re: Help My Skies

When using "other images" notice that you can repeat the same image as many times as you need and do masks so that only the sky on it is used.

Another approach would be to substitute the whole sky for another... a sky is a sky :)

Cheers,

Carlos E G Carvalho (Cartola)
http://cartola.org/360
http://cartola.org/panoforum

2012/6/11 Calvin McDonald <ck1 <at> ckmcdonald.com>

Carlos:

Thanks so much for taking the time to respond. Your tips will help me out.

I do play with masking a bit but I wouldn't call it methodical at all. I kind of do a hit-and-miss approach as I have little skill at it. Occasionally I generate improvement with masks but usually not. I haven't tried using other images. I'll give that a try. My PS skills improve with every pano I make. However, I have a long way to go to fully use the capability of the tool. Thanks for the image editing pointers - they will help.

Calvin

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Carl von Einem | 11 Jun 2012 17:16

Re: Help My Skies

In the upper areas of an equirectangular image the information is so 
compressed that it's not easy to use clone tools etc.
Usually it helps to reproject to cube faces which have a rectilinear 
projection and cover 90 x 90 degrees. Especially for the zenith (also 
the nadir) that helps a lot!

So with Hugin, you can load your equirect back into a new project as 
your input file (lens type: equirectangular, 360 degrees hfov).

In "Images" tab set pitch to -90 degrees (in the Fast preview window you 
can now see the zenith in the center).

In "Stitcher" tab set projection to rectilinear and fov to 90 x 90.
Press "calculate optimal size" and stitch.

With the original panotools this could be done in Photoshop but I bet 
this would also possible with Kays Python scripts, right?

Here is a HowTo for the nadir:
<http://panospace.wordpress.com/2008/03/18/edit-the-nadir/>

Here is more about it in the panotools wiki:
<http://wiki.panotools.org/Extracting_and_inserting_rectilinear_Views>

Cheers,
Carl

Carlos Eduardo G. Carvalho (Cartola) schrieb am 11.06.12 16:52:
> When using "other images" notice that you can repeat the same image as
> many times as you need and do masks so that only the sky on it is used.
>
> Another approach would be to substitute the whole sky for another... a
> sky is a sky :)
>
> Cheers,
>
> Carlos E G Carvalho (Cartola)
> http://cartola.org/360
> http://cartola.org/panoforum
>
>
>
> 2012/6/11 Calvin McDonald <ck1 <at> ckmcdonald.com <mailto:ck1 <at> ckmcdonald.com>>
>
>     Carlos:
>
>     Thanks so much for taking the time to respond.  Your tips will help
>     me out.
>
>     I do play with masking a bit but I wouldn't call it methodical at
>     all.  I kind of do a hit-and-miss approach as I have little skill at
>     it.  Occasionally I generate improvement with masks but usually
>     not.  I haven't tried using other images.  I'll give that a try.  My
>     PS skills improve with every pano I make.  However, I have a long
>     way to go to fully use the capability of the tool.  Thanks for the
>     image editing pointers - they will help.
>
>     Calvin
>
>
>
>     --
>     You received this message because you are subscribed to the Google
>     Groups "Hugin and other free panoramic software" group.
>     A list of frequently asked questions is available at:
>     http://wiki.panotools.org/Hugin_FAQ
>     To post to this group, send email to hugin-ptx <at> googlegroups.com
>     <mailto:hugin-ptx <at> googlegroups.com>
>     To unsubscribe from this group, send email to
>     hugin-ptx+unsubscribe <at> googlegroups.com
>     <mailto:hugin-ptx%2Bunsubscribe <at> googlegroups.com>
>     For more options, visit this group at
>     http://groups.google.com/group/hugin-ptx
>
>
> --
> You received this message because you are subscribed to the Google
> Groups "Hugin and other free panoramic software" group.
> A list of frequently asked questions is available at:
> http://wiki.panotools.org/Hugin_FAQ
> To post to this group, send email to hugin-ptx <at> googlegroups.com
> To unsubscribe from this group, send email to
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software" group.
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Tim Nugent | 11 Jun 2012 17:26

Re: Help My Skies

erect2cubic might help here:

erect2cubic

Takes an equirectangular image and produces a .pto file suitable for

extracting six cube faces.

Usage:

/usr/local/bin/erect2cubic --erect=myerectangular.tif --ptofile=cubic.pto

Options:

--filespec (panotools format, defaults to 'TIFF_m')

--roll (degrees)

--pitch (degrees, use -90 if nadir is in centre)

--yaw (degrees, adjust position of first cubeface)

--face (cubeface size in pixels, defaults to optimum)

On 11 June 2012 16:16, Carl von Einem <carl <at> einem.net> wrote:

In the upper areas of an equirectangular image the information is so compressed that it's not easy to use clone tools etc.
Usually it helps to reproject to cube faces which have a rectilinear projection and cover 90 x 90 degrees. Especially for the zenith (also the nadir) that helps a lot!

So with Hugin, you can load your equirect back into a new project as your input file (lens type: equirectangular, 360 degrees hfov).

In "Images" tab set pitch to -90 degrees (in the Fast preview window you can now see the zenith in the center).

In "Stitcher" tab set projection to rectilinear and fov to 90 x 90.
Press "calculate optimal size" and stitch.

With the original panotools this could be done in Photoshop but I bet this would also possible with Kays Python scripts, right?

Here is a HowTo for the nadir:
<http://panospace.wordpress.com/2008/03/18/edit-the-nadir/>

Here is more about it in the panotools wiki:
<http://wiki.panotools.org/Extracting_and_inserting_rectilinear_Views>

Cheers,
Carl

Carlos Eduardo G. Carvalho (Cartola) schrieb am 11.06.12 16:52:

When using "other images" notice that you can repeat the same image as
many times as you need and do masks so that only the sky on it is used.

Another approach would be to substitute the whole sky for another... a
sky is a sky :)

Cheers,

Carlos E G Carvalho (Cartola)
http://cartola.org/360
http://cartola.org/panoforum

2012/6/11 Calvin McDonald <ck1 <at> ckmcdonald.com <mailto:ck1 <at> ckmcdonald.com>>

Carlos:

Thanks so much for taking the time to respond. Your tips will help
me out.

I do play with masking a bit but I wouldn't call it methodical at
all. I kind of do a hit-and-miss approach as I have little skill at
it. Occasionally I generate improvement with masks but usually
not. I haven't tried using other images. I'll give that a try. My
PS skills improve with every pano I make. However, I have a long
way to go to fully use the capability of the tool. Thanks for the
image editing pointers - they will help.

Calvin

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Carlos Eduardo G. Carvalho (Cartola | 11 Jun 2012 17:36

Re: Help My Skies

Yes, I also use erect2cubic, but to have it you need to install Bruno Postle's Panotools::Script. If someone need it for windows I have it already compiled as a portable version.

Cheers,

Carlos E G Carvalho (Cartola)
http://cartola.org/360
http://cartola.org/panoforum

2012/6/11 Tim Nugent <timnugent <at> gmail.com>

erect2cubic might help here:

erect2cubic

Takes an equirectangular image and produces a .pto file suitable for

extracting six cube faces.

Usage:

/usr/local/bin/erect2cubic --erect=myerectangular.tif --ptofile=cubic.pto

Options:

--filespec (panotools format, defaults to 'TIFF_m')

--roll (degrees)

--pitch (degrees, use -90 if nadir is in centre)

--yaw (degrees, adjust position of first cubeface)

--face (cubeface size in pixels, defaults to optimum)

On 11 June 2012 16:16, Carl von Einem <carl <at> einem.net> wrote:
In the upper areas of an equirectangular image the information is so compressed that it's not easy to use clone tools etc.
Usually it helps to reproject to cube faces which have a rectilinear projection and cover 90 x 90 degrees. Especially for the zenith (also the nadir) that helps a lot!

So with Hugin, you can load your equirect back into a new project as your input file (lens type: equirectangular, 360 degrees hfov).

In "Images" tab set pitch to -90 degrees (in the Fast preview window you can now see the zenith in the center).

In "Stitcher" tab set projection to rectilinear and fov to 90 x 90.
Press "calculate optimal size" and stitch.

With the original panotools this could be done in Photoshop but I bet this would also possible with Kays Python scripts, right?

Here is a HowTo for the nadir:
<http://panospace.wordpress.com/2008/03/18/edit-the-nadir/>

Here is more about it in the panotools wiki:
<http://wiki.panotools.org/Extracting_and_inserting_rectilinear_Views>

Cheers,
Carl

Carlos Eduardo G. Carvalho (Cartola) schrieb am 11.06.12 16:52:

When using "other images" notice that you can repeat the same image as
many times as you need and do masks so that only the sky on it is used.

Another approach would be to substitute the whole sky for another... a
sky is a sky :)

Cheers,

Carlos E G Carvalho (Cartola)
http://cartola.org/360
http://cartola.org/panoforum

2012/6/11 Calvin McDonald <ck1 <at> ckmcdonald.com <mailto:ck1 <at> ckmcdonald.com>>

Carlos:

Thanks so much for taking the time to respond. Your tips will help
me out.

I do play with masking a bit but I wouldn't call it methodical at
all. I kind of do a hit-and-miss approach as I have little skill at
it. Occasionally I generate improvement with masks but usually
not. I haven't tried using other images. I'll give that a try. My
PS skills improve with every pano I make. However, I have a long
way to go to fully use the capability of the tool. Thanks for the
image editing pointers - they will help.

Calvin

--
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