This is a great idea. Fisheye-hemi is the only reason I keep aperture around. Rectilinear correction just doesn't do it, the fisheye-hemi correction makes fisheye lenses useful, rather than just a weird novelty.
> On 27 May 2019, at 15:58, Dane Goodwin <danegood...@gmail.com> wrote: > > Hey all > > I came across this blog which shows an alternative way to correct fisheye > distortion that gives better results than the current rectilinear correction > offered by the lens correction module in darktable: > https://www.lonelyspeck.com/defish/ <https://www.lonelyspeck.com/defish/> > > The blog describes a paid photoshop plugin called fisheye-hemi, and then > shows how you can replicate the results by simply warping the corners of an > image to correct horizontal or vertical fisheye distortion, allowing you to > correct them individually. Here's a link to an image from that article that > shows what I mean nicely: > https://www.lonelyspeck.com/wp-content/uploads/2014/06/Screen-Shot-2014-06-16-at-8.19.32-PM-1024x640.jpg > > <https://www.lonelyspeck.com/wp-content/uploads/2014/06/Screen-Shot-2014-06-16-at-8.19.32-PM-1024x640.jpg> > > The benefit of correcting horizontal and vertical distortion separately is > that you can get much more normal looking people in your photos without > overly correcting other aspects of your photo. Also, if you correct both, you > can get a wider field of view from your fisheye lens than the rectilinear > correction gives you. I've replicated these results in gimp and the approach > works well, but it's a bit time consuming, and I think this would be a > relatively simple module to add to darktable. > > I suggest having a module with the following options: > * stretch the corners horizontally or vertically > * choose by how much > * choose what part of the image you want to be considered center, ie, the > horizon > > These three options should make it easy to correct the distortion for most > types of fisheye lenses, whether or not they're in the lensfun db, and > especially when the rectilinear correction doesn't give you great results. > What do you all think? > > ___________________________________________________________________________ > darktable developer mailing list to unsubscribe send a mail to > darktable-dev+unsubscr...@lists.darktable.org ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
