[Digikam-users] The perspective adjustment tool

Gilles Caulier caulier.gilles at gmail.com
Mon Aug 11 19:08:44 BST 2008

2008/8/11 Gandalf Lechner <gandalf.lechner at univie.ac.at>:
> Hi all,
> after a day of taking architecture fotos at wide angles, I was in desperate
> need of some way to adjust the perspective of the resulting pictures.
> Fortunately, digikam has a perspective adjustment tool :-)
> Here I want to give some proposals for possible improvements of it. I'll check
> if there are already corresponding wishlist entries in bugzilla and write them
> if this is not the case. This email is just for informing the list and
> discussing experiences with the adjustment tool with other users.
> ~~~~
> * First, the lack of anti-aliasing is really a drawback when dealing with
> pictures of buildings. These tend to have many straight lines, which are
> transformed into somewhat zig zaggy lines by the perspective adjustment tool.
> The rotation and shear tools have anti-aliasing, so why not perspective
> adjustment, too?

There is, but code do not take affect. i don't know why. I need
viewpoint form a mathematician here... Perhaps Arnd can take a look ?


> * Second, the adjustments possible with the tool are artificially limited: One
> can only drag the corners of the pictures to the inside. However, dragging the
> vertices outside of the boundaries of the picture can be very useful in many
> situations. Check for example how the gimp deals with this: There you can
> freely adjust the corners of the image, resulting in more freedom of
> adjusting.

Just see your bugzilla entry

> * Third, it would be nice if the grid would also respect the color choice made
> for the guide lines. Auto crop options similar to the ones available in the
> rotate tool would be an additional plus.

same here.


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