The perspective adjustment tool

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The perspective adjustment tool

Bugzilla from gandalf.lechner@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?

* 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.

* 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.

Best,
Gandalf


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Re: The perspective adjustment tool

Gilles Caulier-4
2008/8/11 Gandalf Lechner <[hidden email]>:

> 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 ?

Gilles

>
> * 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.

Gilles
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