darktable ep 044 - The Perspective Correction module

[@TheDusto23]

Thanks for making this video. You've explained things very well.

[@audio2u]

Cheers!

[@CTRL_SMarcos]

Thank you so much for the video. Have a great vacation!

[@audio2u]

Thanks. Will do!

[@DutchTugMaster]

Very clear explanation of the perspective correction module Bruce, thanks for this. Question: I have bought myself a fish-eye lens and I am trying to correct the bent lines with the lens correction module. But also this is not easily done. Read the online manual, but I do not get it right yet. Could You please do a instruction video on this module? Regards from The Netherlands and thanks a lot for Your clear instructions.

[@audio2u]

I'll add that to my to-do list! 😃

[@leona_devon]

Thank you, I've used this module a few times and found it helpful, enjoy your well earned holiday

[@audio2u]

Thanks Leona, sure hope to!

[@philsilverman7431]

Another great tutorial Bruce, thanks very much and have a great time on your hols, regards from England :-)

[@audio2u]

Thanks Phil!

[@hansformat]

Man i LOVE your videos. They made it possible for me to leave LR and switch to Darktable...and i just love it. Amazing piece of software and no more Adobe prices. I shoot film, but am considering a digital camera but was concerned about Darktable not supporting the specific lens coreections that LR does. It would appear to me that this module solves that problem.

[@audio2u]

Thanks for the support! And glad to hear that I helped spring you from AdobeGaol (tm)! :) Yep, darktable is pretty damned powerful. I honestly think it leaves LR for dust.

[@lylestavast7652]

well done explanation, I'll get a chance to mess with this in a couple of weeks. enjoy your holidays :)

[@martinvines3573]

Thank you again for another great explanation of a darktable module. This really helps to clarify the controls of the module. If there is a lot of distortion in the original image, then cropping the image that comes out of this module (to remove the balck areas) can lose a lot of the picture. In Photoshop elements, the free transform function (Ctl + T) provided the possibility of stretching part of the image slightly from any of the corners, to produce an image that fills a rectangle with a more convenient aspect ratio. Does anyone know if darktable has a similar capability?

[@audio2u]

Pretty sure I addressed that in the video... don't adjust for absolute verticals, just go for partial correction. It's basically the same as what you're describing.

[@martinvines3573]

@@audio2u Not really. What you are describing seems to operate on opposite sides of the shape simultaneously. I am used to being able to also stretch each corner more or less independantly.

[@audio2u]

Oh, I see what you're saying. Yeah, nah, darktable does not offer that kind of pixel-pushing. The only module which DOES any kind of pixel-pushing is the Liquify module, but I don't think that will help a great deal in the way you would like it to. :(

[@martinvines3573]

@@audio2u Thank you very much. This sort of help is invaluable with any sort of software. It saves wasting a lot of time looking for features that do not exist. Much appreciated.

[@photomoods-mariobolz8801]

Thanks Bruce great Video .

[@audio2u]

Thanks!

[@Tom-rp8qb]

Very helpful - thanks a lot!

[@audio2u]

No worries!

[@nickknight2095]

Thanks Bruce, another great explanation! Have a great holiday and looking forward to seeing your next video in several weeks time. Do you have a short list of the upcoming topics you are thinking of doing please? Nick

[@audio2u]

Blend modes, an updated noise reduction, database management. I'm sure there was a couple of others.

[@ErebosGR]

13:23 The aspect adjust slider is probably meant for anamorphic lenses.

[@audio2u]

Oh, interesting. Can you explain that for me? Not sure what anamorphic lenses do.

[@cigno5e5]

Ehi Bruce, as usual great video, but today it's me suggesting you something ;) did you know that if you drag the crop selection within the image while using "automatic cropping: original format" darktable will shrink or enlarge the crop area, keeping constant ratio and without overflowing the actual image? Pretty handy gimmick in order to don't use the "Crop & rotate" module!!

[@feklee]

Is it possible to manually add lines? I'm having an image here with a brick facade, and Darktable does not do a good job at analyzing it.

[@audio2u]

Not that I'm aware of. But you can turn on your grid view, which places horizontal and vertical lines on your image. These are helpful for aligning things.

[@feklee]

@@audio2u Thank you! I hope they add such a feature in the future. Aligning with the grid lines I know how to do, but it's cumbersome, especially as Darktable performs quite slowly on my machine (Windows 10, i7, 16GiB).

[@1AngryDpg]

Trying lens correction for the first time and only find Sharpen and lense correction under dropdown how do I get the perspective dropdown to show up?

[@audio2u]

Down int he bottom right hand corner, click on "More modules", and activate the modules you want. There are 3 options for every module... visible, visible + favourite, hidden.

[@cosmo0080]

thank u see u in a month

[@audio2u]

If you cross your fingers, and sip a whisky whilst staring at the full moon, you never know... I might just get another one out before I leave! :)

[@cosmo0080]

@@audio2u i am not a drinker but i could look at the moon and say and drink water

[@audio2u]

Sorry, I should have thought up a better option! Hope I didn't cause offense. 😃

[@cosmo0080]

@@audio2u no offense taken i understand you where not talking to me