Images skewed oddly in a stack

[AndyV]

I had 43 tif files I wanted to stack. They are an animation sequence, and I needed to align each "frame" better. But when I had the stack, I discovered SOME were skewed oddly. And each skew was different from any other skew. Attached are some examples.

One thing I didn't do was click on "Live alignment" (mainly because I didn't know what it did).

BUT I have done this once before with a stack of around 35 images and they all were just fine, NOT skewed at all.

 

[v_kyr]

57 minutes ago, AndyV said:

One thing I didn't do was click on "Live alignment" (mainly because I didn't know what it did).

See therefor ...

• Image stacks

Quote

...
5. Check Live Alignment to add a live perspective filter to each pixel layer in the stack; this allows the perspective of any layer to be adjusted after stacking without affecting its pixel layer (this may affect performance depending on size and number of images to be stacked). Select the layer's perspective filter layer and adjust corner handles on the page.
...

 

[AndyV]

Okay, thank you I guess. But with all due respect, even if I had read that instruction I would have left the live alignment unchecked. It's unclear as to why you need to do that. I would assume from the start that a stack is what it is: a stack of flat images. Why would I even WANT to adjust anything? That any stack would throw all the images off kilter in this very very bizarre way doesn't make any sense. I don't see what purpose it serves. Care to explain that?

I have already experimented with a focus stack and it did what one would expect. It stacked the images. And as I said, a previous stack of images were stacked perfectly fine.

 

EDIT: I just tried a new stack with "Live alignment" checked. The images were skewed even worse!

[smadell]

Hey, @AndyV. Not at my desktop right now, but I think you can avoid the skew by choosing Automatically Align (but not Live Alignment), then changing the default choice of “Perspective” to “Scaling”. I think I had a similar problem, and solved it with that change.

[AndyV]

I should have noted. I did have Auto Align checked.  BUT I didn't have it at Scaling.

 

I just tried it. All that did was make the skewing appear more within a 2D space, 3 out of 5 images were rotated oddly.

 

I should add, these are all the same size images. Same rez.

 

[AndyV]

I've tried to do a new stack yet again. This time with Auto Align OFF and Live Alignment off.

Now all the images (45 in total) are better aligned but moved up and to the left.

I thought this stacking option would be a great time saver. I saw it in the same way that Gimp can "Open as layers". But it just doesn't seem to work. I'm better off just opening them like I've always done: one by one, and adding new layers as I go.

[Callum]

Hi AndyV,

Its hard to say what might be causing this without seeing a copy of the files I'm afraid. If possible could you upload them to the following DropBox link so I can try this at my end?

https://www.dropbox.com/request/q1AENg4wMrQfjOkvs4l6

Thanks
C

[AndyV]

Thanks for your reply. But this was quite awhile ago Callum. I don't have that set up any longer. After I make a set of layers for an animation I just delete the layer file completely. It's just a step towards an end. If I remember correctly, I did what I said in my last comment. I just ignored trying to stack and opened each file one by one, and adding it to the layered image.