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Hello,
Has anyone tried to get rid of the tripod legs on NADIR shots using a software other than Photoshop? I've decided to live without Photoshop to promote independent, smaller software makers instead... (I apply the same concept to Hollywood movies but that's for another post...hmmm another forum even 
)
Anyone using Nikon Capture NX2?
I guess the alternative would be to shot the NADIR:
- without tripod with the challenge to position the camera at same height as when on the tripod
- with a tripod but with a center column positioned horizontally
What do you guys think?
Thanks a lot in advance for your feedback: it's much appreciated.
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free software:
- Paint.Net
- Gimp
nadir in bottom layer, rotating, resizing, retouching ...
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Hi Californian,
I patch the nadir in APP. This is my workflow...
I shoot a 360º in 10 fisheye exposures. 6 Around the horizontal axis at a 60º interval, 1 zenith image, 2 nadir images 90º rotated, finally 1 holding the tripod at 45º over the area where the tripod stood, camera pointing down for the patching image.
Use any photo editor that supports alpha-channels and create an alpha-channel (mask) over the tripods of both nadir shots. Also create an alpha channel over the whole patching image except the area where the tripod stood.
Save images as tiff with alpha-channel and load them into APP.
Detect without lens-correction. Open the Control Points Editor and remove all the links from the patching image to the other images. Create new CPs for the patching image and one of the nadir images, create them as close to the tripod-footprint as possible.
Now optimize with lens-distortion and advanced-distortion. Remove bad CPs, create new CPs if necessary. Optimize again.
Finally for the last optimization, use Local Optimize on the patching-image. Next, use color-correction, straighten the pano and render.
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Thank you SO much for your time and the thoroughness of your post. This is helping me a lot.
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Great tutorial I would say that this should become part of the official wiki (help pages) which is lacking in many areas.
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I use Pixelmator for Mac OS X for editing. It is a great app and definitely worth usd 59. http://www.pixelmator.com/
Take a look at the specs: http://www.pixelmator.com/specs/
Last edited by trondk (2009-08-02 23:15:28)
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Ronald thank you also for a superb and detailed explanation! I've read about using alpha masks over on the panoguide forum but never figured out how to apply with APP - until now!
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@all, glad to be of help, if you need any help don't hesitate to ask.
@trondk, Hi! thank you for pointing out Pixelmator. I've heard about the application but never gave it much attention until now. Unfortunately they don't support 16-bit yet, maybe in the future. Until then I'll keep a close watch on them.
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The patch tool in Pano2VR software is well worth looking at for editing the nadir - in my case applying a mirrorball/logo. I was using Photoshop but this is much more streamlined way of doing it.
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Gimp + Mathmap. Free (as in beer and speech) and powerful.
Extract the nadir from the 360°x180° equirectangular pano using this Mathmap script:
filter ToNadirZenith (image in)
# Filter created by Seb Przd
# Licensed under the GPL
if x<0 then
sinphi1=1;
xx=x+X/2;
else
sinphi1=-1;
xx=x-X/2;
end;
yy=y;
rr=sqrt(xx^2+yy^2);
c=atan(rr/Y);
phi =
if rr == 0 then
0
else
asin(cos(c)*sinphi1)
end;
xxx=atan(xx,-yy*sinphi1)*X/pi;
yyy=phi*Y/(pi/2);
in(xy:[xxx,yyy])
endFix the nadir using the "clone brush", "heal brush", and "heal selection" (intelligently regenerates the selected part based on the edges).
When done, inject the nadir back into the equirectangular pano:
filter FromNadirZenith (image in)
# Filter created by Seb Przd
# Licensed under the GPL
output=1;
if y>Y/4 then
sinphi1=1;
xc=-X/2;
else if y<-Y/4 then
sinphi1=-1;
xc=X/2;
else
output=0;
end;
end;
cosc=sinphi1*sin(y/Y*pi/2);
xx=cos(y/Y*pi/2)*sin(x/X*pi)/cosc;
yy=-sinphi1*cos(y/Y*pi/2)*cos(x/X*pi)/cosc;
if abs(xx)>1 then output=0; end;
if output then
in(xy:[xx*X/2+xc,yy*Y])
else
rgbaColor(0,0,0,0)
end
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KR Pano has this droplets which I put in my dock. Drop the spherical images on this, and it converts it to cube-faces. This cube-faces I can handle in PS, but I am trying to do it as Ronald suggested, with an extra shot 45 degrees and alpha channels.
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