Re: [hugin-ptx] Fit the resulting image as in ACR/PS?

[Bob Bright]

On 2019-08-08 1:58 a.m., Mihai Dobrescu wrote: This is exactly what I did in the second take, as I have already explained. That took too much to process just to calculate the initial cage, that cage vanished unexpectedly, and was a pain to adjust, probably due to the big image. Also, not being possible to persist the cage info makes it a bigger pain. I just tried scaling up your original image from 10 megapixels (6110x1650) to 27 megapixels (10000x2700), and then repeating the cage transformation that I described in my last post. It's slower, but the whole process from beginning to end still only took 7 minutes. The time for Gimp to recalculate the transform each time I moved a point was between 12 and 15 seconds. Note that this was on a vintage AMD A8-7600 machine, with no separate graphics card and 8 GB of ram. I'm pretty sure your "old i7" is at least as fast. (How big is your image, anyway?) As for being able to "persist" the cage, I agree this would be a useful feature. Why don't you suggest to the Gimp developers that they add the ability to save a cage as a path, along with the corresponding path-to-cage function? If you simply can't stand using the cage tool because it's too slow or unintuitive or whatever, you can also use Gimp's warp tool to fill in the corners of your image. Under the warp tool options, change the mode to "Shrink area", and make the size of the brush as large as it will go. Then with some judicious clicking outside the edges of your image, you can shrink the empty parts and achieve a nice result which only distorts the corners and leaves the middle of the image untouched. I personally think the cage tool produces a nicer result because the distortion is better distributed across the image. But it's your image, after all -- use whichever tool suits you, from the point of view of convenience as well as your artistic goals. (Note that if you prefer non-destructive editing, Darktable has a Liquify module which will essentially do the same thing as Gimp's warp tool.) Hence, I'd like to have some cage tool in Hugin, to have it saved in the project, especially that it was said here that are already altered versions of the GIMP cage used to morph or, as you prefer to name it, reshape the source images. Who said there are "already altered versions of the GIMP cage used to morph or ... reshape the source images"? That's not at all how Hugin works. I repeat: to the best of my knowledge, there is NO code presently in Hugin which is capable of doing anything like what the cage tool does in Gimp. There is the alignment code which applies very specific global transformations to the source images, using the lens model developed by Helmut Dersch over 20 years ago; and there is the code which remaps one projection to another. That's basically it, so far as the guts of the program are concerned. If you have the time and inclination to add the functionality you're looking for to Hugin, I'm sure nobody will object. What you're essentially after is some way for the user to specify arbitrary departures from an output projection. I.e., "I've stitched my input images, and now I want my output to be cylindrical, except that I want the bottom left X% of the image to be displaced by a certain amount in a certain direction, and I want the bottom right Y% to be displaced by some other amount in another direction, and ..., and I want those displaced areas to be smoothly blended in with the rest of the panorama." (Hmmm, that sounds suspiciously like what you would get if you took the ordinary cylindrical output from Hugin and used some of the tools in Gimp or Darktable or whatever to displace the areas in question.) Good luck! Cheers, BBB -- Bob Bright Vancouver Island Digital Imaging +1 250 857 9887 bbbri...@victoriavr.ca -- 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 hugin-ptx+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/hugin-ptx/0bba43dc-fa0d-c0ae-56a3-acd556d9f60d%40gmail.com.