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Posted

I really like the deform tool . A very neat and compact solution with a massive scope.

With one major caveat.. it's no good when trying to distort a 'square' image.

For example.. I take a photo of a square. Due to the angle of the camera, the square is distorted in the photo (a bit of parallelogram)

So I want to 'grab' each corner of the image and drag it into a perfect square.

Deform gets me most of the way there.. a node in each corner, and then drag to the corner of the square canvas..

BUT this creates curved edges.. and no matter how I add further nodes to try and 'straighten' the curve.. it's never perfect.

 

The other problem is that there doesn't seem to be any other 'distort filter' which allows me to stretch/distort an image using straight lines

Perspective is too limited.

 

Something like a [modifier key + node drag] which constrains the drag to straight lines would be invaluable

 

Posted

I'll try...

Here's 3 images.. it's a bad quality photo of the page of a book.

I use perspective to get as close as I can

.. then I would hope to just add the nodes detailed on the attached image where I've shown as green and red dots.. maybe that's a bit too optimistic.. but you get the idea.

.. But (and I accept that this is likely user error - bad technique as much as anything) when I use deform.. see how many nodes (48) I have to use to get it right (i.e. black border)

A LOT of those nodes are just to bring a wavy line into a straight line.. but much of the 'waviness' is introduced using the deform tool.. by design it is a 'fluid' scuplting tool. What I need (arguably) is a more 'rigid' version of the same

 

 

ActualNodes.png

NodeLocations.png

PersepectiveTool.png

Posted

The warp tool has no snapping capabilities, it's literally like jelly and you end up fixing warping that has been introduced by trying to correct original distortions.

You can go into Develop Persona and use Develop Personas lens correction capabilities but they are just a small step up from the perspective tool, The image has a complex distortion so it's not going to be a simple fix. 

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Posted
23 minutes ago, firstdefence said:

The warp tool has no snapping capabilities, it's literally like jelly and you end up fixing warping that has been introduced by trying to correct original distortions.

Yes !! Exactly

23 minutes ago, firstdefence said:

You can go into Develop Persona and use Develop Personas lens correction capabilities. 

I'll try that thank you

Posted

To gauge how "out" the lines are I used the Guides manager to make a grid that aligned approx with the page to see how out the lines were and where the distortions lay.

Guide Manager Settings.
image.png.1f005a4c88a33802387387a7bbf2168b.png

Might need a bit of tweaking on the original as this was set on the second image in your OP.
image.png.0a2f1ac493b53e4143b8ef4381f76741.png

iMac 27" 2019 Sequoia 15.0 (24A335), iMac 27" Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Vectorstyler, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9  
B| (Please refrain from licking the screen while using this forum)

Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions

Posted

OK. yes, lens distortion definitely helps.

I just wanted to check if I was missing a technique / tool .. I don't think I am (beyond the lens correction)

It does seem to be a 'missing feature' to some extent (a more rigid method for adjusting an image)

Having come from photoshop, I miss the edit/transfom/warp function.

To be clear it's not that anything is 'impossible' it's more that deform is perfect / amazing in some instances.. and more challenged in others.

in Photoshop parlance.. Deform is very similar to puppet warp, but there isn't a direct equivalent to 'warp'

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