2019-08-08 10:33 UTC+02:00, Bob Bright <[email protected]>: > > What you need to understand about the cage tool is that when you move one of > the points in the cage, the other ones function as anchors to limit the > amount of distortion in their neighbourhood. You don't have to set that many > points, but if you don't set them in appropriate locations, you'll get > bizarre and unacceptable distortions in the rest of your image. > > In the case of the partial crop you posted earlier, if you want to preserve > most of the image but expand the corners to fill the full rectangle, you > need to set at least 9 points, one at each of the vertices in your original > image, like so: > [image] > I've set a 10th point on the left side of the image, for reasons I'll > explain in a moment. Placement of these points doesn't have to be super > accurate, just try to get them close to the vertices. > > Once you've set all your points and closed the cage, you can start dragging > points around to fill in the corners. You'll want to drag point #9 down, > e.g., to fill the bottom left corner. When you do this, points #8 and #10 > will act as anchors to prevent the distortion from propagating too far. > (There's still going to be some distortion in the rest of the image -- there > has to be, because we don't want abrupt transitions -- but the anchors will > keep it within acceptable limits.) > > When you're satisfied with the bottom left corner, move on to the other > corners in turn, dragging #1 up, #4 up, and #6 down and to the right. You'll > also want to drag #10 in a bit, because moving #1 and #9 up and down > respectively moves some of the detail on the left side of the image out of > the frame. When you do this you'll have to go back and fine tune the > placement of #1 and #9 again. Similarly for #5 and #4 & #6. > > Here's what the result of your efforts should look like: > [image] > Once you catch on to it, the whole process shouldn't take more than about > five minutes, even on a relatively slow machine. When you're satisfied with > the result, press the <Enter> key to commit the transformation, and you're > ready to move on to color correction, sharpening, etc. > > Cheers, > BBB > -- > [image] > Bob Bright > Vancouver Island Digital Imaging > +1 250 857 9887 > [email protected]
Excellent tutorial on the cage tool! Thank you. -- Frederic Da Vitoria (davitof) Membre de l'April - « promouvoir et défendre le logiciel libre » - http://www.april.org -- A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ --- You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/hugin-ptx/CANe_y9Th5%2BdSdo_dgwF8WZzH%3DtAwa%2BCRDmNReX_DAQXxL3XjxA%40mail.gmail.com.
